{"id":81,"date":"2026-04-04T06:47:58","date_gmt":"2026-04-04T06:47:58","guid":{"rendered":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/"},"modified":"2026-04-04T06:47:58","modified_gmt":"2026-04-04T06:47:58","slug":"component-breakdown-decoding-er-diagram-symbols","status":"publish","type":"post","link":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/","title":{"rendered":"Ph\u00e2n t\u00edch Th\u00e0nh ph\u1ea7n: Gi\u1ea3i m\u00e3 M\u1ed7i K\u00fd hi\u1ec7u trong S\u01a1 \u0111\u1ed3 ER Chuy\u00ean nghi\u1ec7p"},"content":{"rendered":"

S\u01a1 \u0111\u1ed3 Th\u1ef1c th\u1ec3-M\u1ed1i quan h\u1ec7 \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd n\u1ec1n t\u1ea3ng cho ki\u1ebfn tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u. Ch\u00fang chuy\u1ec3n \u0111\u1ed5i c\u00e1c y\u00eau c\u1ea7u kinh doanh tr\u1eebu t\u01b0\u1ee3ng th\u00e0nh ng\u00f4n ng\u1eef tr\u1ef1c quan c\u00f3 c\u1ea5u tr\u00fac m\u00e0 c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 b\u00ean li\u00ean quan c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c k\u00fd hi\u1ec7u c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u, kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng v\u00e0 s\u1ef1 r\u00f5 r\u00e0ng. Kh\u00f4ng c\u00f3 c\u00e1ch ti\u1ebfp c\u1eadn chu\u1ea9n h\u00f3a trong k\u00fd hi\u1ec7u, s\u1ef1 m\u01a1 h\u1ed3 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn nh\u1eefng l\u1ed7i t\u1ed1n k\u00e9m trong giai \u0111o\u1ea1n tri\u1ec3n khai. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i, m\u1ed1i quan h\u1ec7 v\u00e0 k\u00fd hi\u1ec7u \u0111\u1ecbnh ngh\u0129a m\u1ed9t s\u01a1 \u0111\u1ed3 ER chuy\u00ean nghi\u1ec7p.<\/p>\n

\n
\"Hand-drawn<\/figure>\n<\/div>\n

\ud83c\udfd7\ufe0f Hi\u1ec3u r\u00f5 C\u00e1c Th\u1ef1c th\u1ec3 Ch\u00ednh<\/h2>\n

\u1ede trung t\u00e2m c\u1ee7a m\u1ecdi s\u01a1 \u0111\u1ed3 ER l\u00e0 kh\u00e1i ni\u1ec7m v\u1ec1 m\u1ed9t th\u1ef1c th\u1ec3. M\u1ed9t th\u1ef1c th\u1ec3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c kh\u00e1i ni\u1ec7m trong th\u1ebf gi\u1edbi th\u1ef1c c\u1ea7n \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u. Trong m\u00f4 h\u00ecnh h\u00f3a tr\u1ef1c quan, c\u00e1c th\u1ef1c th\u1ec3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh ch\u1eef nh\u1eadt. V\u0103n b\u1ea3n b\u00ean trong h\u00ecnh ch\u1eef nh\u1eadt ch\u1ec9 t\u00ean c\u1ee7a th\u1ef1c th\u1ec3, th\u01b0\u1eddng \u1edf d\u1ea1ng s\u1ed1 nhi\u1ec1u \u0111\u1ec3 ch\u1ec9 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n

    \n
  • H\u00ecnh d\u1ea1ng H\u00ecnh ch\u1eef nh\u1eadt:<\/strong>\u0110\u00e2y l\u00e0 k\u00fd hi\u1ec7u ph\u1ed5 bi\u1ebfn cho m\u1ed9t th\u1ef1c th\u1ec3. D\u00f9 \u0111\u1ea1i di\u1ec7n cho kh\u00e1ch h\u00e0ng, s\u1ea3n ph\u1ea9m hay giao d\u1ecbch, h\u00ecnh ch\u1eef nh\u1eadt cung c\u1ea5p ranh gi\u1edbi cho \u0111\u1ed1i t\u01b0\u1ee3ng d\u1eef li\u1ec7u.<\/li>\n
  • \u0110\u1eb7t t\u00ean Th\u1ef1c th\u1ec3:<\/strong>T\u00ean n\u00ean \u1edf d\u1ea1ng s\u1ed1 \u00edt ho\u1eb7c s\u1ed1 nhi\u1ec1u nh\u01b0ng ph\u1ea3i nh\u1ea5t qu\u00e1n. V\u00ed d\u1ee5, s\u1eed d\u1ee5ng \u201cKh\u00e1ch h\u00e0ng\u201d cho t\u1ea5t c\u1ea3 c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1ebd tr\u00e1nh nh\u1ea7m l\u1eabn v\u1edbi \u201cKh\u00e1ch h\u00e0ng\u201d \u0111\u01b0\u1ee3c d\u00f9ng xen k\u1ebd trong c\u00f9ng m\u1ed9t m\u00f4 h\u00ecnh.<\/li>\n
  • Kh\u00f3a ch\u00ednh:<\/strong>M\u1ed7i th\u1ef1c th\u1ec3 \u0111\u1ec1u ph\u1ea3i c\u00f3 m\u1ed9t \u0111\u1ecbnh danh duy nh\u1ea5t. Trong k\u00fd hi\u1ec7u, \u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng c\u00e1ch g\u1ea1ch ch\u00e2n t\u00ean thu\u1ed9c t\u00ednh b\u00ean trong h\u1ed9p th\u1ef1c th\u1ec3 ho\u1eb7c b\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh n\u00f3 l\u00e0 kh\u00f3a trong ch\u00fa th\u00edch.<\/li>\n
  • Th\u1ef1c th\u1ec3 Y\u1ebfu:<\/strong>M\u1ed9t s\u1ed1 th\u1ef1c th\u1ec3 ho\u00e0n to\u00e0n ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t th\u1ef1c th\u1ec3 kh\u00e1c \u0111\u1ec3 t\u1ed3n t\u1ea1i. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c v\u1ebd b\u1eb1ng h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai \u0111\u01b0\u1eddng vi\u1ec1n \u0111\u1ec3 ch\u1ec9 s\u1ef1 ph\u1ee5 thu\u1ed9c c\u1ee7a ch\u00fang.<\/li>\n<\/ul>\n

    Khi thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng gi\u1eefa th\u1ef1c th\u1ec3 m\u1ea1nh v\u00e0 th\u1ef1c th\u1ec3 y\u1ebfu ngay t\u1eeb \u0111\u1ea7u qu\u00e1 tr\u00ecnh. M\u1ed9t th\u1ef1c th\u1ec3 m\u1ea1nh c\u00f3 kh\u00f3a ch\u00ednh ri\u00eang, trong khi th\u1ef1c th\u1ec3 y\u1ebfu ph\u1ee5 thu\u1ed9c v\u00e0o kh\u00f3a ch\u00ednh c\u1ee7a th\u1ef1c th\u1ec3 cha c\u1ed9ng th\u00eam m\u1ed9t kh\u00f3a ph\u1ea7n \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u00ednh duy nh\u1ea5t. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch thi\u1ebft l\u1eadp kh\u00f3a ngo\u1ea1i trong c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eadt l\u00fd.<\/p>\n

    \ud83c\udff7\ufe0f Thu\u1ed9c t\u00ednh v\u00e0 C\u00e1ch Bi\u1ec3u di\u1ec5n c\u1ee7a Ch\u00fang<\/h2>\n

    Thu\u1ed9c t\u00ednh x\u00e1c \u0111\u1ecbnh c\u00e1c thu\u1ed9c t\u00ednh ho\u1eb7c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3. Ch\u00fang l\u01b0u tr\u1eef c\u00e1c gi\u00e1 tr\u1ecb d\u1eef li\u1ec7u th\u1ef1c t\u1ebf. Trong khi h\u00ecnh ch\u1eef nh\u1eadt bi\u1ec3u di\u1ec5n th\u1ef1c th\u1ec3, th\u00ec thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb kh\u00e1c nhau t\u00f9y theo chu\u1ea9n k\u00fd hi\u1ec7u \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. M\u1ed9t s\u1ed1 phong c\u00e1ch d\u00f9ng h\u00ecnh elip \u0111\u01b0\u1ee3c n\u1ed1i b\u1eb1ng \u0111\u01b0\u1eddng th\u1eb3ng, trong khi nh\u1eefng phong c\u00e1ch kh\u00e1c li\u1ec7t k\u00ea ch\u00fang b\u00ean trong h\u00ecnh ch\u1eef nh\u1eadt th\u1ef1c th\u1ec3.<\/p>\n

    \ud83d\udd39 Lo\u1ea1i Thu\u1ed9c t\u00ednh<\/h3>\n
      \n
    • Thu\u1ed9c t\u00ednh \u0110\u01a1n gi\u1ea3n:<\/strong>\u0110\u00e2y l\u00e0 c\u00e1c gi\u00e1 tr\u1ecb nguy\u00ean t\u1eed kh\u00f4ng th\u1ec3 chia nh\u1ecf h\u01a1n. V\u00ed d\u1ee5 bao g\u1ed3m s\u1ed1 ID ho\u1eb7c tu\u1ed5i.<\/li>\n
    • Thu\u1ed9c t\u00ednh H\u1ee3p th\u00e0nh:<\/strong>Ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c ph\u1ea7n con. T\u00ean c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh T\u00ean \u0111\u1ec7m v\u00e0 H\u1ecd. Ng\u00e0y th\u00e1ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh Ng\u00e0y, Th\u00e1ng v\u00e0 N\u0103m.<\/li>\n
    • Thu\u1ed9c t\u00ednh Nhi\u1ec1u gi\u00e1 tr\u1ecb:<\/strong>M\u1ed9t th\u1ef1c th\u1ec3 c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u h\u01a1n m\u1ed9t gi\u00e1 tr\u1ecb cho m\u1ed9t thu\u1ed9c t\u00ednh duy nh\u1ea5t. V\u00ed d\u1ee5, m\u1ed9t ng\u01b0\u1eddi c\u00f3 nhi\u1ec1u s\u1ed1 \u0111i\u1ec7n tho\u1ea1i. Trong s\u01a1 \u0111\u1ed3, ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh elip k\u00e9p ho\u1eb7c bi\u1ec3u t\u01b0\u1ee3ng danh s\u00e1ch.<\/li>\n
    • Thu\u1ed9c t\u00ednh \u0110\u01b0\u1ee3c suy ra:<\/strong>Nh\u1eefng gi\u00e1 tr\u1ecb n\u00e0y \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n t\u1eeb c\u00e1c thu\u1ed9c t\u00ednh kh\u00e1c. M\u1ed9t v\u00ed d\u1ee5 l\u00e0 Tu\u1ed5i, c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c suy ra t\u1eeb Ng\u00e0y sinh. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t ho\u1eb7c h\u00ecnh elip \u0111\u1ee9t.<\/li>\n<\/ul>\n

      Vi\u1ec7c ch\u1ecdn bi\u1ec3u di\u1ec5n ph\u00f9 h\u1ee3p cho thu\u1ed9c t\u00ednh \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 d\u1ec5 \u0111\u1ecdc. Li\u1ec7t k\u00ea ch\u00fang b\u00ean trong h\u00ecnh ch\u1eef nh\u1eadt gi\u00fap s\u01a1 \u0111\u1ed3 g\u1ecdn g\u00e0ng h\u01a1n, \u0111i\u1ec1u n\u00e0y h\u1eefu \u00edch cho c\u00e1c m\u00f4 h\u00ecnh logic c\u1ea5p cao. S\u1eed d\u1ee5ng h\u00ecnh elip b\u00ean ngo\u00e0i th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng cho c\u00e1c thi\u1ebft k\u1ebf v\u1eadt l\u00fd chi ti\u1ebft, n\u01a1i m\u00e0 lo\u1ea1i thu\u1ed9c t\u00ednh v\u00e0 r\u00e0ng bu\u1ed9c c\u1ea7n \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n r\u00f5 r\u00e0ng h\u01a1n.<\/p>\n

      \ud83d\udd17 Thi\u1ebft l\u1eadp M\u1ed1i quan h\u1ec7<\/h2>\n

      C\u00e1c m\u1ed1i quan h\u1ec7 x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. Ch\u00fang m\u00f4 t\u1ea3 s\u1ef1 li\u00ean k\u1ebft gi\u1eefa hai ho\u1eb7c nhi\u1ec1u th\u1ef1c th\u1ec3. Trong s\u01a1 \u0111\u1ed3, m\u1ed1i li\u00ean k\u1ebft n\u00e0y \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n tr\u1ef1c quan b\u1eb1ng \u0111\u01b0\u1eddng th\u1eb3ng ho\u1eb7c h\u00ecnh thoi, t\u00f9y theo phong c\u00e1ch k\u00fd hi\u1ec7u.<\/p>\n

      \ud83d\udd39 K\u00fd hi\u1ec7u M\u1ed1i quan h\u1ec7<\/h3>\n
        \n
      • H\u00ecnh d\u1ea1ng H\u00ecnh thoi:<\/strong>Trong k\u00fd hi\u1ec7u Chen truy\u1ec1n th\u1ed1ng, c\u00e1c m\u1ed1i quan h\u1ec7 \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh thoi. T\u00ean th\u1ef1c th\u1ec3 k\u1ebft n\u1ed1i v\u1edbi h\u00ecnh thoi, trong \u0111\u00f3 m\u00f4 t\u1ea3 \u0111\u1ed9ng t\u1eeb ho\u1eb7c h\u00e0nh \u0111\u1ed9ng li\u00ean k\u1ebft ch\u00fang.<\/li>\n
      • D\u00f2ng:<\/strong>Trong k\u00fd hi\u1ec7u Crow\u2019s Foot hi\u1ec7n \u0111\u1ea1i, c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i k\u1ebft c\u00e1c th\u1ef1c th\u1ec3 tr\u1ef1c ti\u1ebfp v\u1edbi nhau. T\u00ean m\u1ed1i quan h\u1ec7 th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1eb7t g\u1ea7n \u0111\u01b0\u1eddng n\u1ed1i ho\u1eb7c \u1edf gi\u1eefa \u0111i\u1ec3m k\u1ebft n\u1ed1i.<\/li>\n
      • Cardinality:<\/strong>C\u00e1c \u0111\u01b0\u1eddng \u0111\u01b0\u1ee3c ghi ch\u00fa b\u1eb1ng c\u00e1c k\u00fd hi\u1ec7u c\u1ee5 th\u1ec3 \u0111\u1ec3 th\u1ec3 hi\u1ec7n s\u1ed1 l\u01b0\u1ee3ng b\u1ea3n th\u1ec3 n\u00e0y li\u00ean quan \u0111\u1ebfn c\u00e1c b\u1ea3n th\u1ec3 kh\u00e1c. \u0110\u00e2y l\u00e0 kh\u00eda c\u1ea1nh quan tr\u1ecdng nh\u1ea5t trong vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a m\u1ed1i quan h\u1ec7.<\/li>\n<\/ul>\n

        Hi\u1ec3u r\u00f5 h\u01b0\u1edbng v\u00e0 lo\u1ea1i m\u1ed1i quan h\u1ec7 l\u00e0 r\u1ea5t quan tr\u1ecdng. M\u1ed9t m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t-\u0111\u1ed1i-m\u1ed9t, m\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u ho\u1eb7c nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u. Vi\u1ec7c m\u00f4 t\u1ea3 sai c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn d\u01b0 th\u1eeba d\u1eef li\u1ec7u trong c\u01a1 s\u1edf d\u1eef li\u1ec7u ho\u1eb7c c\u00e1c b\u1ea3n ghi b\u1ecb b\u1ecf r\u01a1i. V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t th\u01b0 vi\u1ec7n theo d\u00f5i s\u00e1ch v\u00e0 th\u00e0nh vi\u00ean, m\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u01b0\u1ee3n b\u1edfi nhi\u1ec1u th\u00e0nh vi\u00ean, nh\u01b0ng m\u1ed9t th\u00e0nh vi\u00ean c\u0169ng c\u00f3 th\u1ec3 m\u01b0\u1ee3n nhi\u1ec1u cu\u1ed1n s\u00e1ch. \u0110\u00e2y l\u00e0 m\u1ed9t m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u.<\/p>\n

        \ud83d\udccf Gi\u1ea3i th\u00edch c\u00e1c k\u00fd hi\u1ec7u Cardinality<\/h2>\n

        Cardinality quy \u0111\u1ecbnh c\u00e1c r\u00e0ng bu\u1ed9c c\u1ee5 th\u1ec3 \u0111\u1ed1i v\u1edbi m\u1ed1i quan h\u1ec7. N\u00f3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: \u201cS\u1ed1 l\u01b0\u1ee3ng b\u1ea3n th\u1ec3 A c\u00f3 th\u1ec3 li\u00ean k\u1ebft v\u1edbi m\u1ed9t b\u1ea3n th\u1ec3 B l\u00e0 bao nhi\u00eau?\u201d C\u00f3 ba k\u00fd hi\u1ec7u ch\u00ednh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean to\u00e0n c\u1ea7u \u0111\u1ec3 bi\u1ec3u di\u1ec5n \u0111i\u1ec1u n\u00e0y.<\/p>\n

        \ud83d\udd39 K\u00fd hi\u1ec7u Crow\u2019s Foot<\/h3>\n

        \u0110\u00e2y l\u00e0 ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t trong thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i. N\u00f3 s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u c\u1ee5 th\u1ec3 \u1edf cu\u1ed1i \u0111\u01b0\u1eddng m\u1ed1i quan h\u1ec7 \u0111\u1ec3 bi\u1ec3u th\u1ecb s\u1ed1 l\u01b0\u1ee3ng.<\/p>\n

          \n
        • \u0110\u01b0\u1eddng \u0111\u01a1n:<\/strong>Bi\u1ec3u th\u1ecb \u201cm\u1ed9t\u201d.<\/li>\n
        • K\u00fd hi\u1ec7u Crow\u2019s Foot (ba nh\u00e1nh):<\/strong>Bi\u1ec3u th\u1ecb \u201cnhi\u1ec1u\u201d.<\/li>\n
        • V\u00f2ng tr\u00f2n:<\/strong>Bi\u1ec3u th\u1ecb \u201ckh\u00f4ng\u201d (t\u00f9y ch\u1ecdn).<\/li>\n
        • V\u00f2ng tr\u00f2n + \u0110\u01b0\u1eddng th\u1eb3ng:<\/strong>Bi\u1ec3u th\u1ecb \u201ckh\u00f4ng ho\u1eb7c m\u1ed9t\u201d.<\/li>\n
        • V\u00f2ng tr\u00f2n + Crow\u2019s Foot:<\/strong>Bi\u1ec3u th\u1ecb \u201ckh\u00f4ng ho\u1eb7c nhi\u1ec1u\u201d.<\/li>\n<\/ul>\n

          \ud83d\udd39 K\u00fd hi\u1ec7u Chen<\/h3>\n

          K\u00fd hi\u1ec7u Chen s\u1eed d\u1ee5ng c\u00e1c con s\u1ed1 b\u00ean trong \u0111\u01b0\u1eddng m\u1ed1i quan h\u1ec7 \u0111\u1ec3 bi\u1ec3u th\u1ecb cardinality. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c m\u00f4i tr\u01b0\u1eddng h\u1ecdc thu\u1eadt ho\u1eb7c t\u00e0i li\u1ec7u c\u0169.<\/p>\n

            \n
          • (1,1):<\/strong>Ch\u00ednh x\u00e1c m\u1ed9t.<\/li>\n
          • (0,1):<\/strong>Kh\u00f4ng ho\u1eb7c m\u1ed9t.<\/li>\n
          • (0,N):<\/strong>Kh\u00f4ng ho\u1eb7c nhi\u1ec1u.<\/li>\n
          • (1,N):<\/strong>M\u1ed9t ho\u1eb7c nhi\u1ec1u.<\/li>\n<\/ul>\n

            \ud83d\udd39 \u0110a th\u1ee9c UML<\/h3>\n

            Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t s\u1eed d\u1ee5ng c\u00fa ph\u00e1p t\u01b0\u01a1ng t\u1ef1 nh\u01b0 Chen nh\u01b0ng t\u00edch h\u1ee3p s\u00e2u h\u01a1n v\u1edbi c\u00e1c s\u01a1 \u0111\u1ed3 k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m.<\/p>\n

              \n
            • 1:<\/strong>\u0110\u00fang m\u1ed9t.<\/li>\n
            • 0..1:<\/strong>Kh\u00f4ng ho\u1eb7c m\u1ed9t.<\/li>\n
            • 0..*:<\/strong>Kh\u00f4ng ho\u1eb7c nhi\u1ec1u.<\/li>\n
            • 1..*:<\/strong>M\u1ed9t ho\u1eb7c nhi\u1ec1u.<\/li>\n<\/ul>\n\n\n\n\n\n\n\n
              K\u00fd hi\u1ec7u<\/th>\n\u00dd ngh\u0129a k\u00fd hi\u1ec7u<\/th>\nTr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng t\u1ed1t nh\u1ea5t<\/th>\n<\/tr>\n<\/thead>\n
              Ch\u00e2n qu\u1ea1<\/td>\nC\u00e1c \u0111i\u1ec3m m\u00f3c h\u00ecnh \u1ea3nh v\u00e0 \u0111\u01b0\u1eddng n\u1ed1i<\/td>\nThi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u SQL hi\u1ec7n \u0111\u1ea1i<\/td>\n<\/tr>\n
              Chen<\/td>\nS\u1ed1 trong h\u1ed9p<\/td>\nM\u00f4 h\u00ecnh h\u1ecdc thu\u1eadt \/ l\u00fd thuy\u1ebft<\/td>\n<\/tr>\n
              UML<\/td>\nC\u00fa ph\u00e1p kho\u1ea3ng<\/td>\nKi\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m & H\u1ec7 th\u1ed1ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              Vi\u1ec7c ch\u1ecdn k\u00fd hi\u1ec7u ph\u00f9 h\u1ee3p ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ee9c \u0111\u1ed9 quen thu\u1ed9c c\u1ee7a \u0111\u1ed9i ng\u0169 v\u00e0 c\u00f4ng c\u1ee5 s\u1eb5n c\u00f3. Ch\u00e2n qu\u1ea1 th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng nh\u1edd t\u00ednh tr\u1ef1c quan h\u00ecnh \u1ea3nh trong vi\u1ec7c th\u1ec3 hi\u1ec7n c\u00e1c r\u00e0ng bu\u1ed9c c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/p>\n

              \u26a0\ufe0f Entiti y\u1ebfu v\u00e0 m\u1ed1i quan h\u1ec7 x\u00e1c \u0111\u1ecbnh<\/h2>\n

              Kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c th\u1ef1c th\u1ec3 \u0111\u1ec1u nh\u01b0 nhau. M\u1ed9t s\u1ed1 ch\u1ec9 t\u1ed3n t\u1ea1i v\u00ec m\u1ed9t th\u1ef1c th\u1ec3 kh\u00e1c t\u1ed3n t\u1ea1i. Nh\u1eefng th\u1ef1c th\u1ec3 n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 th\u1ef1c th\u1ec3 y\u1ebfu. Trong s\u01a1 \u0111\u1ed3 ER, ch\u00fang y\u00eau c\u1ea7u c\u00e1c k\u00fd hi\u1ec7u \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 ch\u1ec9 ra m\u1ed1i ph\u1ee5 thu\u1ed9c n\u00e0y.<\/p>\n

                \n
              • H\u00ecnh ch\u1eef nh\u1eadt k\u00e9p:<\/strong>Ch\u1ec9 ra m\u1ed9t th\u1ef1c th\u1ec3 y\u1ebfu. Th\u1ef1c th\u1ec3 n\u00e0y kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh duy nh\u1ea5t n\u1ebfu kh\u00f4ng c\u00f3 th\u1ef1c th\u1ec3 cha.<\/li>\n
              • H\u00ecnh thoi k\u00e9p:<\/strong>Ch\u1ec9 ra m\u1ed1i quan h\u1ec7 x\u00e1c \u0111\u1ecbnh. M\u1ed1i quan h\u1ec7 n\u00e0y l\u00e0 b\u1eaft bu\u1ed9c \u0111\u1ec3 th\u1ef1c th\u1ec3 y\u1ebfu t\u1ed3n t\u1ea1i.<\/li>\n
              • \u0110\u01b0\u1eddng n\u00e9t \u0111\u1ee9t:<\/strong>\u0110\u00f4i khi \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 k\u1ebft n\u1ed1i th\u1ef1c th\u1ec3 y\u1ebfu v\u1edbi ch\u1ee7 s\u1edf h\u1eefu c\u1ee7a n\u00f3, nh\u1ea5n m\u1ea1nh m\u1ed1i ph\u1ee5 thu\u1ed9c.<\/li>\n<\/ul>\n

                V\u00ed d\u1ee5, h\u00e3y xem x\u00e9t m\u1ed9t th\u1ef1c th\u1ec3 “Ng\u01b0\u1eddi ph\u1ee5 thu\u1ed9c” trong h\u1ec7 th\u1ed1ng “Nh\u00e2n vi\u00ean”. M\u1ed9t ng\u01b0\u1eddi ph\u1ee5 thu\u1ed9c s\u1ebd kh\u00f4ng t\u1ed3n t\u1ea1i trong c\u01a1 s\u1edf d\u1eef li\u1ec7u tr\u1eeb khi c\u00f3 m\u1ed9t nh\u00e2n vi\u00ean li\u00ean k\u1ebft v\u1edbi h\u1ecd. Kh\u00f3a ch\u00ednh c\u1ee7a b\u1ea3ng Ng\u01b0\u1eddi ph\u1ee5 thu\u1ed9c s\u1ebd bao g\u1ed3m M\u00e3 nh\u00e2n vi\u00ean. M\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u r\u00f5 r\u00e0ng \u0111\u1ec3 tr\u00e1nh m\u1ea5t d\u1eef li\u1ec7u trong qu\u00e1 tr\u00ecnh sinh l\u01b0\u1ee3c \u0111\u1ed3.<\/p>\n

                \ud83d\udee0\ufe0f C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 r\u00f5 r\u00e0ng c\u1ee7a s\u01a1 \u0111\u1ed3<\/h2>\n

                M\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1ed1t s\u1ebd gi\u1ea3m t\u1ea3i nh\u1eadn th\u1ee9c cho c\u00e1c k\u1ef9 s\u01b0 v\u00e0 c\u00e1c b\u00ean li\u00ean quan. Vi\u1ec7c tu\u00e2n theo c\u00e1c quy \u01b0\u1edbc \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp \u0111\u1ea3m b\u1ea3o m\u00f4 h\u00ecnh v\u1eabn d\u1ec5 hi\u1ec3u theo th\u1eddi gian.<\/p>\n

                  \n
                • T\u00ednh nh\u1ea5t qu\u00e1n l\u00e0 ch\u00eca kh\u00f3a:<\/strong>S\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t phong c\u00e1ch k\u00fd hi\u1ec7u trong su\u1ed1t d\u1ef1 \u00e1n. Vi\u1ec7c tr\u1ed9n l\u1eabn k\u00fd hi\u1ec7u Crow\u2019s Foot v\u1edbi k\u00fd hi\u1ec7u Chen s\u1ebd g\u00e2y nh\u1ea7m l\u1eabn.<\/li>\n
                • Quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean:<\/strong>\u0110\u1ea3m b\u1ea3o t\u00ean b\u1ea3ng v\u00e0 c\u1ed9t tu\u00e2n theo quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean chu\u1ea9n, ch\u1eb3ng h\u1ea1n nh\u01b0 camelCase ho\u1eb7c snake_case, \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi nh\u00e3n tr\u00ean s\u01a1 \u0111\u1ed3.<\/li>\n
                • Ph\u00e2n nh\u00f3m:<\/strong>N\u1ebfu s\u01a1 \u0111\u1ed3 l\u1edbn, h\u00e3y nh\u00f3m c\u00e1c th\u1ef1c th\u1ec3 li\u00ean quan l\u1ea1i v\u1edbi nhau b\u1eb1ng c\u00e1c h\u1ed9p ho\u1eb7c container nh\u00f3m. \u0110i\u1ec1u n\u00e0y gi\u00fap qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p.<\/li>\n
                • Th\u1ee9 b\u1eadc:<\/strong>\u0110\u1eb7t c\u00e1c th\u1ef1c th\u1ec3 c\u1ea5p cao \u1edf tr\u00ean ho\u1eb7c \u1edf trung t\u00e2m, v\u1edbi c\u00e1c th\u1ef1c th\u1ec3 ph\u1ee5 thu\u1ed9c nh\u00e1nh ra xung quanh. \u0110i\u1ec1u n\u00e0y m\u00f4 ph\u1ecfng lu\u1ed3ng c\u00e1c m\u1ed1i quan h\u1ec7 d\u1eef li\u1ec7u.<\/li>\n
                • T\u00e0i li\u1ec7u:<\/strong>Th\u00eam ch\u00fa gi\u1ea3i ho\u1eb7c b\u1ea3ng gi\u1ea3i th\u00edch n\u1ebfu s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u kh\u00f4ng chu\u1ea9n. Gi\u1ea3i th\u00edch b\u1ea5t k\u1ef3 ch\u1eef vi\u1ebft t\u1eaft n\u00e0o \u0111\u01b0\u1ee3c d\u00f9ng trong s\u01a1 \u0111\u1ed3.<\/li>\n<\/ul>\n

                  \ud83d\udeab Nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh<\/h2>\n

                  Ngay c\u1ea3 nh\u1eefng ng\u01b0\u1eddi m\u00f4 h\u00ecnh h\u00f3a c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m. Nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng \u0111i\u1ec3m nguy hi\u1ec3m ph\u1ed5 bi\u1ebfn s\u1ebd gi\u00fap duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a thi\u1ebft k\u1ebf.<\/p>\n

                    \n
                  • Thi\u1ebfu kh\u00f3a ch\u00ednh:<\/strong>M\u1ed7i b\u1ea3ng \u0111\u1ec1u ph\u1ea3i c\u00f3 kh\u00f3a ch\u00ednh. B\u1ecf qua \u0111i\u1ec1u n\u00e0y s\u1ebd d\u1eabn \u0111\u1ebfn c\u00e1c b\u1ea3n ghi tr\u00f9ng l\u1eb7p v\u00e0 s\u1ef1 b\u1ea5t \u1ed5n \u0111\u1ecbnh d\u1eef li\u1ec7u.<\/li>\n
                  • M\u1ed1i quan h\u1ec7 nhi\u1ec1u – nhi\u1ec1u m\u00e0 kh\u00f4ng c\u00f3 b\u1ea3ng trung gian:<\/strong>K\u1ebft n\u1ed1i tr\u1ef1c ti\u1ebfp hai th\u1ef1c th\u1ec3 v\u1edbi m\u1ed1i quan h\u1ec7 nhi\u1ec1u – nhi\u1ec1u m\u00e0 kh\u00f4ng c\u00f3 b\u1ea3ng trung gian l\u00e0 kh\u00f4ng h\u1ee3p l\u1ec7 trong c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7. B\u1ea1n ph\u1ea3i gi\u1ea3i quy\u1ebft \u0111i\u1ec1u n\u00e0y th\u00e0nh hai m\u1ed1i quan h\u1ec7 m\u1ed9t – nhi\u1ec1u.<\/li>\n
                  • T\u01b0\u01a1ng t\u00e1c v\u00f2ng l\u1eb7p:<\/strong>Tr\u00e1nh t\u1ea1o c\u00e1c v\u00f2ng l\u1eb7p n\u01a1i Th\u1ef1c th\u1ec3 A tham chi\u1ebfu \u0111\u1ebfn B, B tham chi\u1ebfu \u0111\u1ebfn C, v\u00e0 C tham chi\u1ebfu l\u1ea1i \u0111\u1ebfn A. \u0110i\u1ec1u n\u00e0y l\u00e0m ph\u1ee9c t\u1ea1p hi\u1ec7u su\u1ea5t truy v\u1ea5n v\u00e0 t\u1ea3i d\u1eef li\u1ec7u.<\/li>\n
                  • Chu\u1ea9n h\u00f3a qu\u00e1 m\u1ee9c:<\/strong>M\u1eb7c d\u00f9 chu\u1ea9n h\u00f3a l\u00e0 t\u1ed1t, nh\u01b0ng vi\u1ec7c chia nh\u1ecf b\u1ea3ng qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t. \u0110\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 c\u00e2n b\u1eb1ng gi\u1eefa t\u00ednh to\u00e0n v\u1eb9n v\u00e0 t\u00ednh kh\u1ea3 d\u1ee5ng.<\/li>\n
                  • Nh\u00e3n m\u01a1 h\u1ed3:<\/strong>Tr\u00e1nh d\u00f9ng c\u00e1c thu\u1eadt ng\u1eef m\u01a1 h\u1ed3 nh\u01b0 “Th\u00f4ng tin” hay “Chi ti\u1ebft”. H\u00e3y c\u1ee5 th\u1ec3 h\u01a1n. D\u00f9ng “CustomerAddress” thay v\u00ec “Th\u00f4ng tin”.<\/li>\n<\/ul>\n

                    \ud83d\udd04 S\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a l\u01b0\u1ee3c \u0111\u1ed3<\/h2>\n

                    Thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u hi\u1ebfm khi l\u00e0 t\u0129nh. Y\u00eau c\u1ea7u kinh doanh thay \u0111\u1ed5i, v\u00e0 s\u01a1 \u0111\u1ed3 ph\u1ea3i ph\u00e1t tri\u1ec3n theo ch\u00fang. Khi c\u1eadp nh\u1eadt s\u01a1 \u0111\u1ed3 ER, h\u00e3y theo d\u00f5i c\u00e1c thay \u0111\u1ed5i v\u1ec1 k\u00fd hi\u1ec7u v\u00e0 m\u1ed1i quan h\u1ec7.<\/p>\n

                      \n
                    • Ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n:<\/strong>Duy tr\u00ec c\u00e1c phi\u00ean b\u1ea3n c\u1ee7a s\u01a1 \u0111\u1ed3 \u0111\u1ec3 theo d\u00f5i c\u00e1ch c\u00e1c m\u1ed1i quan h\u1ec7 \u0111\u00e3 thay \u0111\u1ed5i theo th\u1eddi gian.<\/li>\n
                    • Ph\u00e2n t\u00edch t\u00e1c \u0111\u1ed9ng:<\/strong> Tr\u01b0\u1edbc khi x\u00f3a m\u1ed9t bi\u1ec3u t\u01b0\u1ee3ng ho\u1eb7c m\u1ed1i quan h\u1ec7, h\u00e3y ph\u00e2n t\u00edch t\u00e1c \u0111\u1ed9ng v\u1ec1 ph\u00eda sau \u0111\u1ed1i v\u1edbi d\u1eef li\u1ec7u v\u00e0 \u1ee9ng d\u1ee5ng hi\u1ec7n c\u00f3.<\/li>\n
                    • Giao ti\u1ebfp:<\/strong> \u0110\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c b\u00ean li\u00ean quan xem x\u00e9t c\u00e1c thay \u0111\u1ed5i \u0111\u1ed1i v\u1edbi bi\u1ec3u t\u01b0\u1ee3ng m\u1edbi ho\u1eb7c c\u00e1c cardinalities \u0111\u00e3 thay \u0111\u1ed5i. M\u1ed9t thay \u0111\u1ed5i trong \u0111\u1ecbnh ngh\u0129a m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng logic \u1ee9ng d\u1ee5ng.<\/li>\n<\/ul>\n

                      \ud83d\udd0d C\u00e1c c\u00e2n nh\u1eafc v\u1ec1 tri\u1ec3n khai k\u1ef9 thu\u1eadt<\/h2>\n

                      Chuy\u1ec3n \u0111\u1ed5i s\u01a1 \u0111\u1ed3 tr\u1ef1c quan th\u00e0nh m\u00e3 c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u1ef1c t\u1ebf \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00fa \u00fd \u0111\u1ebfn chi ti\u1ebft. C\u00e1c bi\u1ec3u t\u01b0\u1ee3ng tr\u00ean trang x\u00e1c \u0111\u1ecbnh c\u00e1c l\u1ec7nh SQL \u0111\u01b0\u1ee3c sinh ra.<\/p>\n

                        \n
                      • Kh\u00f3a ngo\u1ea1i:<\/strong> C\u00e1c \u0111\u01b0\u1eddng trong s\u01a1 \u0111\u1ed3 \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 s\u1ebd tr\u1edf th\u00e0nh r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. H\u01b0\u1edbng c\u1ee7a \u0111\u01b0\u1eddng x\u00e1c \u0111\u1ecbnh b\u1ea3ng n\u00e0o gi\u1eef kh\u00f3a.<\/li>\n
                      • Ch\u1ec9 m\u1ee5c:<\/strong> Kh\u00f3a ch\u00ednh t\u1ef1 \u0111\u1ed9ng t\u1ea1o ch\u1ec9 m\u1ee5c. C\u00e1c kh\u00f3a ph\u1ee5 ho\u1eb7c r\u00e0ng bu\u1ed9c duy nh\u1ea5t \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong s\u01a1 \u0111\u1ed3 c\u1ea7n \u0111\u01b0\u1ee3c khai b\u00e1o r\u00f5 r\u00e0ng.<\/li>\n
                      • Ki\u1ec3u d\u1eef li\u1ec7u:<\/strong> Trong khi s\u01a1 \u0111\u1ed3 th\u1ec3 hi\u1ec7n c\u1ea5u tr\u00fac, c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u n\u1ec1n t\u1ea3ng (VARCHAR, INT, DATE) ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi ki\u1ec3u thu\u1ed9c t\u00ednh.<\/li>\n
                      • R\u00e0ng bu\u1ed9c:<\/strong> T\u00ednh kh\u1ea3 thi null th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng k\u00fd hi\u1ec7u h\u00ecnh tr\u00f2n trong k\u00fd hi\u1ec7u cardinality. \u0110\u1ea3m b\u1ea3o c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eadt l\u00fd th\u1ef1c thi c\u00e1c r\u00e0ng bu\u1ed9c n\u00e0y.<\/li>\n<\/ul>\n

                        B\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc n\u00e0y, qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i t\u1eeb thi\u1ebft k\u1ebf sang tri\u1ec3n khai tr\u1edf n\u00ean tr\u01a1n tru h\u01a1n. S\u01a1 \u0111\u1ed3 kh\u00f4ng ch\u1ec9 \u0111\u00f3ng vai tr\u00f2 l\u00e0 t\u00e0i li\u1ec7u, m\u00e0 c\u00f2n l\u00e0 m\u1ed9t b\u1ea3n m\u00f4 t\u1ea3 c\u00f3 th\u1ec3 th\u1ef1c thi cho b\u1ed9 \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/p>\n

                        \ud83d\udcdd T\u00f3m t\u1eaft \u00fd ngh\u0129a c\u1ee7a c\u00e1c bi\u1ec3u t\u01b0\u1ee3ng<\/h2>\n

                        \u0110\u1ec3 h\u1ed7 tr\u1ee3 tra c\u1ee9u nhanh, d\u01b0\u1edbi \u0111\u00e2y l\u00e0 t\u00f3m t\u1eaft c\u00e1c bi\u1ec3u t\u01b0\u1ee3ng quan tr\u1ecdng nh\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u00f4 h\u00ecnh h\u00f3a chuy\u00ean nghi\u1ec7p.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
                        Bi\u1ec3u t\u01b0\u1ee3ng<\/th>\n\u00dd ngh\u0129a<\/th>\nB\u1ed1i c\u1ea3nh<\/th>\n<\/tr>\n<\/thead>\n
                        H\u00ecnh ch\u1eef nh\u1eadt<\/td>\n\u0110\u1ed1i t\u01b0\u1ee3ng \/ B\u1ea3ng<\/td>\n\u0110\u1ed1i t\u01b0\u1ee3ng ch\u00ednh<\/td>\n<\/tr>\n
                        H\u00ecnh elip<\/td>\nThu\u1ed9c t\u00ednh \/ C\u1ed9t<\/td>\n\u0110i\u1ec3m d\u1eef li\u1ec7u<\/td>\n<\/tr>\n
                        H\u00ecnh thoi<\/td>\nM\u1ed1i quan h\u1ec7<\/td>\nLo\u1ea1i k\u1ebft n\u1ed1i<\/td>\n<\/tr>\n
                        \u0110\u01b0\u1eddng<\/td>\nS\u1ef1 k\u1ebft h\u1ee3p<\/td>\nK\u1ebft n\u1ed1i gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3<\/td>\n<\/tr>\n
                        Ch\u00e2n qu\u1ea1<\/td>\nNhi\u1ec1u<\/td>\nS\u1ed1 l\u01b0\u1ee3ng<\/td>\n<\/tr>\n
                        H\u00ecnh ch\u1eef nh\u1eadt k\u00e9p<\/td>\nTh\u1ef1c th\u1ec3 y\u1ebfu<\/td>\nS\u1ef1 ph\u1ee5 thu\u1ed9c<\/td>\n<\/tr>\n
                        G\u1ea1ch ch\u00e2n<\/td>\nKh\u00f3a ch\u00ednh<\/td>\nT\u00ednh duy nh\u1ea5t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                        Th\u00e0nh th\u1ea1o c\u00e1c th\u00e0nh ph\u1ea7n n\u00e0y cho ph\u00e9p t\u1ea1o ra c\u00e1c m\u00f4 h\u00ecnh d\u1eef li\u1ec7u v\u1eefng ch\u1eafc. N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng logic \u0111\u1eb1ng sau d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c b\u1ea3o t\u1ed3n v\u00e0 h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 ph\u00e1t tri\u1ec3n m\u00e0 kh\u00f4ng g\u1eb7p s\u1ef1 c\u1ed1 v\u1ec1 c\u1ea5u tr\u00fac. T\u1eadp trung v\u00e0o s\u1ef1 r\u00f5 r\u00e0ng, ch\u00ednh x\u00e1c v\u00e0 tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n \u0111\u1ec3 t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 v\u01b0\u1ee3t qua th\u1eed th\u00e1ch c\u1ee7a th\u1eddi gian.<\/p>\n

                        \ud83e\udded Nh\u1eefng suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a m\u00f4 h\u00ecnh<\/h2>\n

                        T\u00ednh to\u00e0n v\u1eb9n c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u1ee5 thu\u1ed9c r\u1ea5t l\u1edbn v\u00e0o \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a thi\u1ebft k\u1ebf. M\u1ed7i k\u00fd hi\u1ec7u \u0111\u1ec1u mang \u00fd ngh\u0129a quan tr\u1ecdng trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1ch d\u1eef li\u1ec7u di chuy\u1ec3n v\u00e0 li\u00ean k\u1ebft. B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 c\u00e1c chi ti\u1ebft v\u1ec1 th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7, b\u1ea1n \u0111\u1ea3m b\u1ea3o r\u1eb1ng h\u1ec7 th\u1ed1ng cu\u1ed1i c\u00f9ng \u0111\u00e1p \u1ee9ng nhu c\u1ea7u kinh doanh m\u00e0 kh\u00f4ng ph\u00e1t sinh n\u1ee3 k\u1ef9 thu\u1eadt. Vi\u1ec7c xem x\u00e9t th\u01b0\u1eddng xuy\u00ean s\u01a1 \u0111\u1ed3 so v\u1edbi tri\u1ec3n khai th\u1ef1c t\u1ebf gi\u00fap duy tr\u00ec s\u1ef1 \u0111\u1ed3ng b\u1ed9 n\u00e0y. H\u1ecdc t\u1eadp li\u00ean t\u1ee5c c\u00e1c ti\u00eau chu\u1ea9n k\u00fd hi\u1ec7u gi\u00fap qu\u00e1 tr\u00ecnh thi\u1ebft k\u1ebf tr\u1edf n\u00ean hi\u1ec7u qu\u1ea3 v\u00e0 hi\u1ec7u qu\u1ea3.<\/p>\n

                        \u0110\u1ea7u t\u01b0 th\u1eddi gian \u0111\u1ec3 h\u1ecdc c\u00e1c k\u00fd hi\u1ec7u n\u00e0y s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch l\u1edbn trong giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n v\u00e0 b\u1ea3o tr\u00ec. N\u00f3 gi\u1ea3m thi\u1ec3u s\u1ef1 hi\u1ec3u l\u1ea7m gi\u1eefa c\u00e1c nh\u00e0 ph\u00e2n t\u00edch kinh doanh v\u00e0 nh\u00e0 ph\u00e1t tri\u1ec3n. \u0110\u1ed3ng th\u1eddi, n\u00f3 c\u0169ng \u0111\u01a1n gi\u1ea3n h\u00f3a vi\u1ec7c kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 khi x\u1ea3y ra s\u1ef1 b\u1ea5t nh\u1ea5t trong d\u1eef li\u1ec7u. M\u1ed9t s\u01a1 \u0111\u1ed3 r\u00f5 r\u00e0ng l\u00e0 c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd cho b\u1ea5t k\u1ef3 chuy\u00ean gia d\u1eef li\u1ec7u n\u00e0o.<\/p>\n","protected":false},"excerpt":{"rendered":"

                        S\u01a1 \u0111\u1ed3 Th\u1ef1c th\u1ec3-M\u1ed1i quan h\u1ec7 \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd n\u1ec1n t\u1ea3ng cho ki\u1ebfn tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u. Ch\u00fang chuy\u1ec3n \u0111\u1ed5i c\u00e1c y\u00eau c\u1ea7u kinh doanh tr\u1eebu…<\/p>\n","protected":false},"author":1,"featured_media":82,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"C\u00e1c k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 k\u00fd hi\u1ec7u v\u00e0 \u00fd ngh\u0129a","_yoast_wpseo_metadesc":"H\u1ecdc thu\u1ed9c t\u1eebng k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER. H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7 v\u00e0 k\u00fd hi\u1ec7u s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh x\u00e1c.","inline_featured_image":false,"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[6],"tags":[10,11],"class_list":["post-81","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-erd","tag-academic","tag-erd"],"yoast_head":"\nC\u00e1c k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 k\u00fd hi\u1ec7u v\u00e0 \u00fd ngh\u0129a<\/title>\n<meta name=\"description\" content=\"H\u1ecdc thu\u1ed9c t\u1eebng k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER. H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7 v\u00e0 k\u00fd hi\u1ec7u s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh x\u00e1c.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00e1c k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 k\u00fd hi\u1ec7u v\u00e0 \u00fd ngh\u0129a\" \/>\n<meta property=\"og:description\" content=\"H\u1ecdc thu\u1ed9c t\u1eebng k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER. H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7 v\u00e0 k\u00fd hi\u1ec7u s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh x\u00e1c.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/\" \/>\n<meta property=\"og:site_name\" content=\"We Notes Ti\u1ebfng Vi\u1ec7t\u2013 Collaborative AI Insights & Intelligence Hub\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-04T06:47:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/04\/er-diagram-symbols-sketch-infographic.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1664\" \/>\n\t<meta property=\"og:image:height\" content=\"928\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"vpadmin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"21 ph\u00fat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/\"},\"author\":{\"name\":\"vpadmin\",\"@id\":\"https:\/\/www.we-notes.com\/vn\/#\/schema\/person\/6fb9f9e55a3031c51049e541adf4642c\"},\"headline\":\"Ph\u00e2n t\u00edch Th\u00e0nh ph\u1ea7n: Gi\u1ea3i m\u00e3 M\u1ed7i K\u00fd hi\u1ec7u trong S\u01a1 \u0111\u1ed3 ER Chuy\u00ean nghi\u1ec7p\",\"datePublished\":\"2026-04-04T06:47:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/\"},\"wordCount\":4285,\"publisher\":{\"@id\":\"https:\/\/www.we-notes.com\/vn\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/04\/er-diagram-symbols-sketch-infographic.jpg\",\"keywords\":[\"academic\",\"erd\"],\"articleSection\":[\"ERD\"],\"inLanguage\":\"vi\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/\",\"url\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/\",\"name\":\"C\u00e1c k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 k\u00fd hi\u1ec7u v\u00e0 \u00fd ngh\u0129a\",\"isPartOf\":{\"@id\":\"https:\/\/www.we-notes.com\/vn\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/04\/er-diagram-symbols-sketch-infographic.jpg\",\"datePublished\":\"2026-04-04T06:47:58+00:00\",\"description\":\"H\u1ecdc thu\u1ed9c t\u1eebng k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER. H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7 v\u00e0 k\u00fd hi\u1ec7u s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh x\u00e1c.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#breadcrumb\"},\"inLanguage\":\"vi\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#primaryimage\",\"url\":\"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/04\/er-diagram-symbols-sketch-infographic.jpg\",\"contentUrl\":\"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/04\/er-diagram-symbols-sketch-infographic.jpg\",\"width\":1664,\"height\":928},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.we-notes.com\/vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Ph\u00e2n t\u00edch Th\u00e0nh ph\u1ea7n: Gi\u1ea3i m\u00e3 M\u1ed7i K\u00fd hi\u1ec7u trong S\u01a1 \u0111\u1ed3 ER Chuy\u00ean nghi\u1ec7p\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.we-notes.com\/vn\/#website\",\"url\":\"https:\/\/www.we-notes.com\/vn\/\",\"name\":\"We Notes Ti\u1ebfng Vi\u1ec7t\u2013 Collaborative AI Insights & Intelligence Hub\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.we-notes.com\/vn\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.we-notes.com\/vn\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"vi\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.we-notes.com\/vn\/#organization\",\"name\":\"We Notes Ti\u1ebfng Vi\u1ec7t\u2013 Collaborative AI Insights & Intelligence Hub\",\"url\":\"https:\/\/www.we-notes.com\/vn\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\/\/www.we-notes.com\/vn\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/03\/we-notes-logo.png\",\"contentUrl\":\"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/03\/we-notes-logo.png\",\"width\":1042,\"height\":322,\"caption\":\"We Notes Ti\u1ebfng Vi\u1ec7t\u2013 Collaborative AI Insights & Intelligence Hub\"},\"image\":{\"@id\":\"https:\/\/www.we-notes.com\/vn\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.we-notes.com\/vn\/#\/schema\/person\/6fb9f9e55a3031c51049e541adf4642c\",\"name\":\"vpadmin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\/\/www.we-notes.com\/vn\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g\",\"caption\":\"vpadmin\"},\"sameAs\":[\"https:\/\/www.we-notes.com\"],\"url\":\"https:\/\/www.we-notes.com\/vn\/author\/vpadmin\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"C\u00e1c k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 k\u00fd hi\u1ec7u v\u00e0 \u00fd ngh\u0129a","description":"H\u1ecdc thu\u1ed9c t\u1eebng k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER. H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7 v\u00e0 k\u00fd hi\u1ec7u s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh x\u00e1c.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/","og_locale":"vi_VN","og_type":"article","og_title":"C\u00e1c k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 k\u00fd hi\u1ec7u v\u00e0 \u00fd ngh\u0129a","og_description":"H\u1ecdc thu\u1ed9c t\u1eebng k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER. H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7 v\u00e0 k\u00fd hi\u1ec7u s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh x\u00e1c.","og_url":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/","og_site_name":"We Notes Ti\u1ebfng Vi\u1ec7t\u2013 Collaborative AI Insights & Intelligence Hub","article_published_time":"2026-04-04T06:47:58+00:00","og_image":[{"width":1664,"height":928,"url":"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/04\/er-diagram-symbols-sketch-infographic.jpg","type":"image\/jpeg"}],"author":"vpadmin","twitter_card":"summary_large_image","twitter_misc":{"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi":false,"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc":"21 ph\u00fat"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#article","isPartOf":{"@id":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/"},"author":{"name":"vpadmin","@id":"https:\/\/www.we-notes.com\/vn\/#\/schema\/person\/6fb9f9e55a3031c51049e541adf4642c"},"headline":"Ph\u00e2n t\u00edch Th\u00e0nh ph\u1ea7n: Gi\u1ea3i m\u00e3 M\u1ed7i K\u00fd hi\u1ec7u trong S\u01a1 \u0111\u1ed3 ER Chuy\u00ean nghi\u1ec7p","datePublished":"2026-04-04T06:47:58+00:00","mainEntityOfPage":{"@id":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/"},"wordCount":4285,"publisher":{"@id":"https:\/\/www.we-notes.com\/vn\/#organization"},"image":{"@id":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#primaryimage"},"thumbnailUrl":"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/04\/er-diagram-symbols-sketch-infographic.jpg","keywords":["academic","erd"],"articleSection":["ERD"],"inLanguage":"vi"},{"@type":"WebPage","@id":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/","url":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/","name":"C\u00e1c k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 k\u00fd hi\u1ec7u v\u00e0 \u00fd ngh\u0129a","isPartOf":{"@id":"https:\/\/www.we-notes.com\/vn\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#primaryimage"},"image":{"@id":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#primaryimage"},"thumbnailUrl":"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/04\/er-diagram-symbols-sketch-infographic.jpg","datePublished":"2026-04-04T06:47:58+00:00","description":"H\u1ecdc thu\u1ed9c t\u1eebng k\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3 ER. H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7 v\u00e0 k\u00fd hi\u1ec7u s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh x\u00e1c.","breadcrumb":{"@id":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#breadcrumb"},"inLanguage":"vi","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/"]}]},{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#primaryimage","url":"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/04\/er-diagram-symbols-sketch-infographic.jpg","contentUrl":"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/04\/er-diagram-symbols-sketch-infographic.jpg","width":1664,"height":928},{"@type":"BreadcrumbList","@id":"https:\/\/www.we-notes.com\/vn\/component-breakdown-decoding-er-diagram-symbols\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.we-notes.com\/vn\/"},{"@type":"ListItem","position":2,"name":"Ph\u00e2n t\u00edch Th\u00e0nh ph\u1ea7n: Gi\u1ea3i m\u00e3 M\u1ed7i K\u00fd hi\u1ec7u trong S\u01a1 \u0111\u1ed3 ER Chuy\u00ean nghi\u1ec7p"}]},{"@type":"WebSite","@id":"https:\/\/www.we-notes.com\/vn\/#website","url":"https:\/\/www.we-notes.com\/vn\/","name":"We Notes Ti\u1ebfng Vi\u1ec7t\u2013 Collaborative AI Insights & Intelligence Hub","description":"","publisher":{"@id":"https:\/\/www.we-notes.com\/vn\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.we-notes.com\/vn\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"vi"},{"@type":"Organization","@id":"https:\/\/www.we-notes.com\/vn\/#organization","name":"We Notes Ti\u1ebfng Vi\u1ec7t\u2013 Collaborative AI Insights & Intelligence Hub","url":"https:\/\/www.we-notes.com\/vn\/","logo":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/www.we-notes.com\/vn\/#\/schema\/logo\/image\/","url":"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/03\/we-notes-logo.png","contentUrl":"https:\/\/www.we-notes.com\/vn\/wp-content\/uploads\/sites\/25\/2026\/03\/we-notes-logo.png","width":1042,"height":322,"caption":"We Notes Ti\u1ebfng Vi\u1ec7t\u2013 Collaborative AI Insights & Intelligence Hub"},"image":{"@id":"https:\/\/www.we-notes.com\/vn\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.we-notes.com\/vn\/#\/schema\/person\/6fb9f9e55a3031c51049e541adf4642c","name":"vpadmin","image":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/www.we-notes.com\/vn\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g","caption":"vpadmin"},"sameAs":["https:\/\/www.we-notes.com"],"url":"https:\/\/www.we-notes.com\/vn\/author\/vpadmin\/"}]}},"_links":{"self":[{"href":"https:\/\/www.we-notes.com\/vn\/wp-json\/wp\/v2\/posts\/81","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.we-notes.com\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.we-notes.com\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.we-notes.com\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.we-notes.com\/vn\/wp-json\/wp\/v2\/comments?post=81"}],"version-history":[{"count":0,"href":"https:\/\/www.we-notes.com\/vn\/wp-json\/wp\/v2\/posts\/81\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.we-notes.com\/vn\/wp-json\/wp\/v2\/media\/82"}],"wp:attachment":[{"href":"https:\/\/www.we-notes.com\/vn\/wp-json\/wp\/v2\/media?parent=81"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.we-notes.com\/vn\/wp-json\/wp\/v2\/categories?post=81"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.we-notes.com\/vn\/wp-json\/wp\/v2\/tags?post=81"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}