{"id":363,"date":"2026-04-04T18:03:03","date_gmt":"2026-04-04T18:03:03","guid":{"rendered":"https:\/\/www.we-notes.com\/vn\/er-diagrams-vs-data-flow-diagrams-backend-guide\/"},"modified":"2026-04-03T02:36:23","modified_gmt":"2026-04-03T02:36:23","slug":"er-diagrams-vs-data-flow-diagrams-backend-guide","status":"publish","type":"post","link":"https:\/\/www.we-notes.com\/vn\/er-diagrams-vs-data-flow-diagrams-backend-guide\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 ER so v\u1edbi S\u01a1 \u0111\u1ed3 Lu\u1ed3ng D\u1eef li\u1ec7u: Bi\u1ebft khi n\u00e0o m\u1ed7i lo\u1ea1i ph\u1ee5c v\u1ee5 nhu c\u1ea7u Backend c\u1ee7a b\u1ea1n"},"content":{"rendered":"

Ki\u1ebfn tr\u00fac Backend d\u1ef1a v\u00e0o t\u00e0i li\u1ec7u ch\u00ednh x\u00e1c \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3. Kh\u00f4ng c\u00f3 c\u00e1c bi\u1ec3u di\u1ec5n tr\u1ef1c quan r\u00f5 r\u00e0ng v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef v\u00e0 di chuy\u1ec3n qua h\u1ec7 th\u1ed1ng, \u0111\u1ed9 ph\u1ee9c t\u1ea1p nhanh ch\u00f3ng tr\u1edf n\u00ean m\u1ea5t ki\u1ec3m so\u00e1t. Hai c\u00f4ng c\u1ee5 ch\u00ednh th\u1ed1ng tr\u1ecb l\u0129nh v\u1ef1c thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng l\u00e0 S\u01a1 \u0111\u1ed3 Th\u1ef1c th\u1ec3-M\u1ed1i quan h\u1ec7 (ERD) v\u00e0 S\u01a1 \u0111\u1ed3 Lu\u1ed3ng D\u1eef li\u1ec7u (DFD). M\u1eb7c d\u00f9 c\u1ea3 hai \u0111\u1ec1u ph\u1ee5c v\u1ee5 m\u1ee5c \u0111\u00edch m\u00f4 h\u00ecnh h\u00f3a, ch\u00fang gi\u1ea3i quy\u1ebft nh\u1eefng c\u00e2u h\u1ecfi c\u01a1 b\u1ea3n kh\u00e1c nhau. M\u1ed9t c\u00e1i t\u1eadp trung v\u00e0o c\u1ea5u tr\u00fac, trong khi c\u00e1i kia t\u1eadp trung v\u00e0o quy tr\u00ecnh.<\/p>\n

Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c k\u1ef9 thu\u1eadt m\u00f4 h\u00ecnh h\u00f3a n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi k\u1ef9 s\u01b0 Backend, qu\u1ea3n tr\u1ecb vi\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 ki\u1ebfn tr\u00fac s\u01b0 h\u1ec7 th\u1ed1ng. Vi\u1ec7c nh\u1ea7m l\u1eabn ch\u00fang c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 kh\u00f4ng th\u1ec3 h\u1ed7 tr\u1ee3 c\u00e1c quy tr\u00ecnh l\u00e0m vi\u1ec7c \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u ho\u1eb7c c\u00e1c quy tr\u00ecnh l\u00e0m vi\u1ec7c b\u1ecf qua c\u00e1c r\u00e0ng bu\u1ed9c d\u1eef li\u1ec7u quan tr\u1ecdng. H\u01b0\u1edbng d\u1eabn n\u00e0y cung c\u1ea5p s\u1ef1 ph\u00e2n t\u00edch to\u00e0n di\u1ec7n v\u1ec1 th\u1eddi \u0111i\u1ec3m \u00e1p d\u1ee5ng t\u1eebng lo\u1ea1i s\u01a1 \u0111\u1ed3 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng Backend c\u1ee7a b\u1ea1n v\u1eabn m\u1ea1nh m\u1ebd, c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec. \ud83d\udee0\ufe0f<\/p>\n

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\"Infographic<\/figure>\n<\/div>\n

\ud83c\udfd7\ufe0f S\u01a1 \u0111\u1ed3 Th\u1ef1c th\u1ec3-M\u1ed1i quan h\u1ec7 (ERD) l\u00e0 g\u00ec?<\/h2>\n

S\u01a1 \u0111\u1ed3 Th\u1ef1c th\u1ec3-M\u1ed1i quan h\u1ec7 l\u00e0 m\u1ed9t m\u00f4 h\u00ecnh t\u0129nh. N\u00f3 bi\u1ec3u di\u1ec5n c\u1ea5u tr\u00fac c\u1ee7a d\u1eef li\u1ec7u trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. N\u00f3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi:D\u1eef li\u1ec7u n\u00e0o t\u1ed3n t\u1ea1i, v\u00e0 n\u00f3 li\u00ean quan \u0111\u1ebfn d\u1eef li\u1ec7u kh\u00e1c nh\u01b0 th\u1ebf n\u00e0o?<\/strong>Tr\u1ecdng t\u00e2m ch\u00ednh l\u00e0 c\u00e1c th\u1ef1c th\u1ec3, t\u1ee9c l\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c kh\u00e1i ni\u1ec7m, v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa ch\u00fang. K\u1ef9 thu\u1eadt m\u00f4 h\u00ecnh h\u00f3a n\u00e0y l\u00e0 n\u1ec1n t\u1ea3ng cho thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7.<\/p>\n

C\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a m\u1ed9t ERD<\/h3>\n
    \n
  • Th\u1ef1c th\u1ec3:<\/strong>\u0110\u00e2y l\u00e0 c\u00e1c danh t\u1eeb trong h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n. V\u00ed d\u1ee5 bao g\u1ed3mKh\u00e1ch h\u00e0ng<\/em>, \u0110\u01a1n h\u00e0ng<\/em>, S\u1ea3n ph\u1ea9m<\/em>, ho\u1eb7cNg\u01b0\u1eddi d\u00f9ng<\/em>. Trong c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eadt l\u00fd, ch\u00fang th\u01b0\u1eddng \u00e1nh x\u1ea1 \u0111\u1ebfn c\u00e1c b\u1ea3ng.<\/li>\n
  • Thu\u1ed9c t\u00ednh:<\/strong>\u0110\u00e2y l\u00e0 c\u00e1c thu\u1ed9c t\u00ednh m\u00f4 t\u1ea3 m\u1ed9t th\u1ef1c th\u1ec3. \u0110\u1ed1i v\u1edbi th\u1ef1c th\u1ec3Kh\u00e1ch h\u00e0ng<\/em>, c\u00e1c thu\u1ed9c t\u00ednh c\u00f3 th\u1ec3 bao g\u1ed3mID<\/em>, T\u00ean<\/em>, Email<\/em>, v\u00e0S\u1ed1 \u0111i\u1ec7n tho\u1ea1i<\/em>. Ch\u00fang \u00e1nh x\u1ea1 \u0111\u1ebfn c\u00e1c c\u1ed9t trong m\u1ed9t b\u1ea3ng.<\/li>\n
  • M\u1ed1i quan h\u1ec7:<\/strong> Ch\u00fang x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 t\u01b0\u01a1ng t\u00e1c. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n d\u01b0\u1edbi d\u1ea1ng \u0111\u1ed9ng t\u1eeb. V\u00ed d\u1ee5, m\u1ed9t Kh\u00e1ch h\u00e0ng<\/em> \u0110\u1eb7t<\/em> m\u1ed9t \u0110\u01a1n h\u00e0ng<\/em>. M\u1ed1i quan h\u1ec7 x\u00e1c \u0111\u1ecbnh t\u00ednh \u0111a tr\u1ecb c\u1ee7a d\u1eef li\u1ec7u, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u1ed9t-m\u1ed9t, m\u1ed9t-nhi\u1ec1u, ho\u1eb7c nhi\u1ec1u-nhi\u1ec1u.<\/li>\n
  • Kh\u00f3a:<\/strong> Kh\u00f3a ch\u00ednh x\u00e1c \u0111\u1ecbnh duy nh\u1ea5t m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3. Kh\u00f3a ngo\u1ea1i li\u00ean k\u1ebft c\u00e1c th\u1ef1c th\u1ec3 v\u1edbi nhau, thi\u1ebft l\u1eadp t\u00ednh to\u00e0n v\u1eb9n tham chi\u1ebfu.<\/li>\n<\/ul>\n

    T\u1ea1i sao s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) l\u1ea1i quan tr\u1ecdng \u0111\u1ed1i v\u1edbi ph\u00e1t tri\u1ec3n backend<\/h3>\n

    S\u01a1 \u0111\u1ed3 ERD quy \u0111\u1ecbnh l\u01b0\u1ee3c \u0111\u1ed3. Khi c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n vi\u1ebft m\u00e3 \u0111\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u01a1 s\u1edf d\u1eef li\u1ec7u, h\u1ecd \u0111ang d\u1ef1a v\u00e0o c\u00e1c r\u00e0ng bu\u1ed9c \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong s\u01a1 \u0111\u1ed3 n\u00e0y. M\u1ed9t s\u01a1 \u0111\u1ed3 ERD \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1ed1t \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u. N\u00f3 ng\u0103n ch\u1eb7n c\u00e1c b\u1ea3n ghi b\u1ecb c\u00f4 l\u1eadp v\u00e0 \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c m\u1ed1i quan h\u1ec7 \u0111\u01b0\u1ee3c th\u1ef1c thi \u1edf c\u1ea5p \u0111\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/p>\n

    C\u00e1c c\u00e2n nh\u1eafc ch\u00ednh khi thi\u1ebft k\u1ebf m\u1ed9t s\u01a1 \u0111\u1ed3 ERD bao g\u1ed3m:<\/p>\n

      \n
    • Chu\u1ea9n h\u00f3a:<\/strong> Gi\u1ea3m s\u1ef1 d\u01b0 th\u1eeba d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch t\u1ed5 ch\u1ee9c c\u00e1c thu\u1ed9c t\u00ednh th\u00e0nh c\u00e1c nh\u00f3m logic. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn vi\u1ec7c tu\u00e2n th\u1ee7 c\u00e1c d\u1ea1ng chu\u1ea9n (1NF, 2NF, 3NF).<\/li>\n
    • Ki\u1ec3u d\u1eef li\u1ec7u:<\/strong> X\u00e1c \u0111\u1ecbnh ki\u1ec3u d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 (s\u1ed1 nguy\u00ean, chu\u1ed7i, d\u1ea5u th\u1eddi gian) \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o l\u01b0u tr\u1eef v\u00e0 truy xu\u1ea5t hi\u1ec7u qu\u1ea3.<\/li>\n
    • R\u00e0ng bu\u1ed9c:<\/strong> Thi\u1ebft l\u1eadp c\u00e1c quy t\u1eafc nh\u01b0 KH\u00d4NG NULL<\/code>, DUY NH\u1ea4T<\/code>, ho\u1eb7c KI\u1ec2M TRA<\/code> r\u00e0ng bu\u1ed9c m\u00e0 c\u00f4ng c\u1ee5 c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u1ea3i th\u1ef1c thi.<\/li>\n
    • Hi\u1ec7u su\u1ea5t:<\/strong> X\u00e1c \u0111\u1ecbnh c\u00e1c tr\u01b0\u1eddng n\u00e0o c\u1ea7n \u0111\u01b0\u1ee3c l\u1eadp ch\u1ec9 m\u1ee5c d\u1ef1a tr\u00ean c\u00e1c m\u1eabu truy v\u1ea5n.<\/li>\n<\/ul>\n

      N\u1ebfu b\u1ea1n \u0111ang thi\u1ebft k\u1ebf m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1edbi ho\u1eb7c t\u00e1i c\u1ea5u tr\u00fac m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u hi\u1ec7n c\u00f3, th\u00ec s\u01a1 \u0111\u1ed3 ERD l\u00e0 b\u1ea3n v\u1ebd ch\u00ednh c\u1ee7a b\u1ea1n. N\u00f3 l\u00e0 ngu\u1ed3n s\u1ef1 th\u1eadt cho l\u1edbp l\u01b0u tr\u1eef c\u1ee7a \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n.<\/p>\n

      \ud83d\udd04 S\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u (DFD) l\u00e0 g\u00ec?<\/h2>\n

      Tr\u00e1i ng\u01b0\u1ee3c v\u1edbi t\u00ednh t\u0129nh c\u1ee7a s\u01a1 \u0111\u1ed3 ERD, s\u01a1 \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u l\u00e0 m\u1ed9t m\u00f4 h\u00ecnh \u0111\u1ed9ng. N\u00f3 bi\u1ec3u di\u1ec5n s\u1ef1 di chuy\u1ec3n c\u1ee7a d\u1eef li\u1ec7u qua m\u1ed9t h\u1ec7 th\u1ed1ng. N\u00f3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: D\u1eef li\u1ec7u v\u00e0o, thay \u0111\u1ed5i v\u00e0 r\u1eddi kh\u1ecfi h\u1ec7 th\u1ed1ng nh\u01b0 th\u1ebf n\u00e0o?<\/strong>N\u00f3 t\u1eadp trung v\u00e0o c\u00e1c quy tr\u00ecnh, kho d\u1eef li\u1ec7u, th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i v\u00e0 c\u00e1c lu\u1ed3ng k\u1ebft n\u1ed1i ch\u00fang.<\/p>\n

      C\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a DFD<\/h3>\n
        \n
      • Quy tr\u00ecnh:<\/strong>\u0110\u00e2y l\u00e0 c\u00e1c h\u00e0nh \u0111\u1ed9ng ho\u1eb7c ph\u00e9p bi\u1ebfn \u0111\u1ed5i \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho d\u1eef li\u1ec7u. M\u1ed9t quy tr\u00ecnh nh\u1eadn d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o, th\u1ef1c hi\u1ec7n t\u00ednh to\u00e1n ho\u1eb7c logic, v\u00e0 t\u1ea1o ra d\u1eef li\u1ec7u \u0111\u1ea7u ra. Trong thu\u1eadt ng\u1eef backend, \u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t h\u00e0m, d\u1ecbch v\u1ee5 ho\u1eb7c \u0111i\u1ec3m cu\u1ed1i API.<\/li>\n
      • Kho d\u1eef li\u1ec7u:<\/strong>Ch\u00fang bi\u1ec3u th\u1ecb n\u01a1i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef khi ngh\u1ec9. Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1c b\u1ea3ng c\u01a1 s\u1edf d\u1eef li\u1ec7u trong s\u01a1 \u0111\u1ed3 ERD, c\u00e1c kho d\u1eef li\u1ec7u trong DFD l\u00e0 c\u00e1c v\u1ecb tr\u00ed tr\u1eebu t\u01b0\u1ee3ng n\u01a1i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u gi\u1eef gi\u1eefa c\u00e1c quy tr\u00ecnh. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t t\u1ec7p, m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u ho\u1eb7c m\u1ed9t h\u00e0ng \u0111\u1ee3i.<\/li>\n
      • Th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i:<\/strong>\u0110\u00e2y l\u00e0 c\u00e1c ngu\u1ed3n ho\u1eb7c \u0111\u00edch c\u1ee7a d\u1eef li\u1ec7u n\u1eb1m ngo\u00e0i ranh gi\u1edbi h\u1ec7 th\u1ed1ng. C\u00e1c v\u00ed d\u1ee5 bao g\u1ed3m m\u1ed9t Tr\u00ecnh duy\u1ec7t web<\/em>, m\u1ed9t API b\u00ean th\u1ee9 ba<\/em>, ho\u1eb7c m\u1ed9t Ng\u01b0\u1eddi v\u1eadn h\u00e0nh<\/em>.<\/li>\n
      • Lu\u1ed3ng d\u1eef li\u1ec7u:<\/strong>\u0110\u00e2y l\u00e0 c\u00e1c m\u0169i t\u00ean ch\u1ec9 h\u01b0\u1edbng di chuy\u1ec3n c\u1ee7a d\u1eef li\u1ec7u. M\u1ed7i lu\u1ed3ng \u0111\u01b0\u1ee3c g\u1eafn nh\u00e3n v\u1edbi t\u00ean c\u1ee7a g\u00f3i d\u1eef li\u1ec7u \u0111ang \u0111\u01b0\u1ee3c chuy\u1ec3n giao.<\/li>\n<\/ul>\n

        C\u00e1c m\u1ee9c tr\u1eebu t\u01b0\u1ee3ng h\u00f3a c\u1ee7a DFD<\/h3>\n

        DFD th\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh c\u00e1c l\u1edbp \u0111\u1ec3 qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p:<\/p>\n

          \n
        • S\u01a1 \u0111\u1ed3 ng\u1eef c\u1ea3nh (M\u1ee9c 0):<\/strong>M\u1ed9t c\u00e1i nh\u00ecn t\u1ed5ng quan \u1edf m\u1ee9c cao, hi\u1ec3n th\u1ecb to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng nh\u01b0 m\u1ed9t quy tr\u00ecnh duy nh\u1ea5t v\u00e0 c\u00e1c t\u01b0\u01a1ng t\u00e1c c\u1ee7a n\u00f3 v\u1edbi c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i.<\/li>\n
        • S\u01a1 \u0111\u1ed3 M\u1ee9c 1:<\/strong>Ph\u00e2n t\u00e1ch quy tr\u00ecnh ch\u00ednh th\u00e0nh c\u00e1c quy tr\u00ecnh con ch\u00ednh. \u0110i\u1ec1u n\u00e0y cung c\u1ea5p c\u00e1i nh\u00ecn t\u1ed5ng quan v\u1ec1 ch\u1ee9c n\u0103ng c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n
        • S\u01a1 \u0111\u1ed3 M\u1ee9c 2:<\/strong>Ph\u00e2n r\u00e3 th\u00eam c\u00e1c quy tr\u00ecnh con c\u1ee5 th\u1ec3 th\u00e0nh c\u00e1c b\u01b0\u1edbc chi ti\u1ebft h\u01a1n, h\u1eefu \u00edch cho vi\u1ec7c thi\u1ebft k\u1ebf logic chi ti\u1ebft.<\/li>\n<\/ul>\n

          T\u1ea1i sao DFD l\u1ea1i quan tr\u1ecdng \u0111\u1ed1i v\u1edbi ph\u00e1t tri\u1ec3n backend<\/h3>\n

          DFD \u00e1nh x\u1ea1 logic v\u00e0 lu\u1ed3ng c\u1ee7a \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n. N\u00f3 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 hi\u1ec3u v\u00f2ng \u0111\u1eddi c\u1ee7a d\u1eef li\u1ec7u. N\u00f3 gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m ngh\u1ebdn, l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt trong truy\u1ec1n d\u1eef li\u1ec7u v\u00e0 vi\u1ec7c di chuy\u1ec3n d\u1eef li\u1ec7u kh\u00f4ng c\u1ea7n thi\u1ebft.<\/p>\n

          C\u00e1c c\u00e2n nh\u1eafc ch\u00ednh khi thi\u1ebft k\u1ebf DFD bao g\u1ed3m:<\/p>\n

            \n
          • X\u00e1c th\u1ef1c \u0111\u1ea7u v\u00e0o:<\/strong>\u0110\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ki\u1ec3m tra tr\u01b0\u1edbc khi \u0111i v\u00e0o m\u1ed9t quy tr\u00ecnh.<\/li>\n
          • B\u1ea3o m\u1eadt:<\/strong>X\u00e1c \u0111\u1ecbnh n\u01a1i d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m b\u1ecb ph\u01a1i b\u00e0y ho\u1eb7c truy\u1ec1n \u0111i.<\/li>\n
          • X\u1eed l\u00fd b\u1ea5t \u0111\u1ed3ng b\u1ed9:<\/strong>Hi\u1ec3n th\u1ecb n\u01a1i d\u1eef li\u1ec7u di chuy\u1ec3n qua h\u00e0ng \u0111\u1ee3i ho\u1eb7c c\u00e1c t\u00e1c v\u1ee5 n\u1ec1n thay v\u00ec c\u00e1c ph\u1ea3n h\u1ed3i t\u1ee9c th\u00ec.<\/li>\n
          • Qu\u1ea3n l\u00fd tr\u1ea1ng th\u00e1i:<\/strong>Tr\u1ef1c quan h\u00f3a c\u00e1ch d\u1eef li\u1ec7u thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i khi di chuy\u1ec3n qua h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n

            N\u1ebfu b\u1ea1n \u0111ang thi\u1ebft k\u1ebf API, ki\u1ebfn tr\u00fac vi d\u1ecbch v\u1ee5 ho\u1eb7c m\u1ed9t quy tr\u00ecnh x\u1eed l\u00fd d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p, th\u00ec DFD l\u00e0 c\u00f4ng c\u1ee5 ch\u00ednh c\u1ee7a b\u1ea1n \u0111\u1ec3 \u00e1nh x\u1ea1 logic.<\/p>\n

            \u2696\ufe0f S\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh: ERD so v\u1edbi DFD<\/h2>\n

            S\u1ef1 nh\u1ea7m l\u1eabn th\u01b0\u1eddng x\u1ea3y ra v\u00ec c\u1ea3 hai s\u01a1 \u0111\u1ed3 \u0111\u1ec1u x\u1eed l\u00fd d\u1eef li\u1ec7u. Tuy nhi\u00ean, m\u1ee5c \u0111\u00edch, \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 k\u1ebft qu\u1ea3 \u0111\u1ea7u ra c\u1ee7a ch\u00fang kh\u00e1c bi\u1ec7t \u0111\u00e1ng k\u1ec3. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y n\u00eau r\u00f5 c\u00e1c \u0111i\u1ec3m kh\u00e1c bi\u1ec7t c\u1ee5 th\u1ec3 \u0111\u1ec3 gi\u00fap b\u1ea1n ch\u1ecdn c\u00f4ng c\u1ee5 ph\u00f9 h\u1ee3p cho nhi\u1ec7m v\u1ee5. \ud83d\udccb<\/p>\n\n\n\n\n\n\n\n\n\n\n
            \u0110\u1eb7c \u0111i\u1ec3m<\/th>\nS\u01a1 \u0111\u1ed3 Th\u1ef1c th\u1ec3-M\u1ed1i quan h\u1ec7 (ERD)<\/th>\nS\u01a1 \u0111\u1ed3 Lu\u1ed3ng d\u1eef li\u1ec7u (DFD)<\/th>\n<\/tr>\n<\/thead>\n
            Tr\u1ecdng t\u00e2m ch\u00ednh<\/strong><\/td>\nC\u1ea5u tr\u00fac d\u1eef li\u1ec7u v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7<\/td>\nDi chuy\u1ec3n v\u00e0 chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u<\/td>\n<\/tr>\n
            Kh\u00eda c\u1ea1nh th\u1eddi gian<\/strong><\/td>\nT\u0129nh (\u1ea2nh ch\u1ee5p nhanh c\u1ee7a l\u01b0\u1ee3c \u0111\u1ed3)<\/td>\n\u0110\u1ed9ng (Chu\u1ed7i c\u00e1c thao t\u00e1c)<\/td>\n<\/tr>\n
            C\u00e1c y\u1ebfu t\u1ed1 ch\u00ednh<\/strong><\/td>\nB\u1ea3ng, c\u1ed9t, kh\u00f3a, r\u00e0ng bu\u1ed9c<\/td>\nQuy tr\u00ecnh, lu\u1ed3ng, kho d\u1eef li\u1ec7u, th\u1ef1c th\u1ec3<\/td>\n<\/tr>\n
            \u1ee8ng d\u1ee5ng ph\u00eda m\u00e1y ch\u1ee7<\/strong><\/td>\nThi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u, di chuy\u1ec3n l\u01b0\u1ee3c \u0111\u1ed3<\/td>\nThi\u1ebft k\u1ebf API, logic quy tr\u00ecnh l\u00e0m vi\u1ec7c, \u0111\u01b0\u1eddng \u1ed1ng d\u1eef li\u1ec7u<\/td>\n<\/tr>\n
            K\u1ebft qu\u1ea3 \u0111\u1ea7u ra<\/strong><\/td>\nK\u1ecbch b\u1ea3n SQL, l\u01b0\u1ee3c \u0111\u1ed3 v\u1eadt l\u00fd<\/td>\nLogic quy tr\u00ecnh, giao di\u1ec7n d\u1ecbch v\u1ee5<\/td>\n<\/tr>\n
            X\u1eed l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p<\/strong><\/td>\nChu\u1ea9n h\u00f3a, l\u1ef1c l\u01b0\u1ee3ng<\/td>\nPh\u00e2n r\u00e3, ranh gi\u1edbi ng\u1eef c\u1ea3nh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            \ud83c\udfaf Khi n\u00e0o s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 ER<\/h2>\n

            C\u00f3 nh\u1eefng k\u1ecbch b\u1ea3n c\u1ee5 th\u1ec3 m\u00e0 ERD l\u00e0 \u0111i\u1ec3m b\u1eaft bu\u1ed9c ph\u1ea3i b\u1eaft \u0111\u1ea7u. Vi\u1ec7c s\u1eed d\u1ee5ng DFD trong nh\u1eefng t\u00ecnh hu\u1ed1ng n\u00e0y s\u1ebd kh\u00f4ng th\u1ec3 n\u1eafm b\u1eaft \u0111\u01b0\u1ee3c c\u00e1c r\u00e0ng bu\u1ed9c quan tr\u1ecdng c\u1ea7n thi\u1ebft cho t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u.<\/p>\n

            1. Thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u ban \u0111\u1ea7u<\/h3>\n

            Khi b\u1eaft \u0111\u1ea7u m\u1ed9t d\u1ef1 \u00e1n m\u1edbi, b\u1ea1n ph\u1ea3i x\u00e1c \u0111\u1ecbnh l\u1edbp l\u01b0u tr\u1eef tr\u01b0\u1edbc khi \u0111\u1ecbnh ngh\u0129a logic. ERD cho ph\u00e9p b\u1ea1n l\u1eadp k\u1ebf ho\u1ea1ch cho l\u01b0\u1ee3c \u0111\u1ed3. N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c \u0111i\u1ec3m d\u1eef li\u1ec7u c\u1ea7n thi\u1ebft \u0111\u01b0\u1ee3c thu th\u1eadp v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 c\u00f3 t\u00ednh logic v\u1eefng ch\u1eafc tr\u01b0\u1edbc khi b\u1ea5t k\u1ef3 m\u00e3 n\u00e0o \u0111\u01b0\u1ee3c vi\u1ebft ra.<\/p>\n

            2. T\u00e1i c\u1ea5u tr\u00fac l\u01b0\u1ee3c \u0111\u1ed3<\/h3>\n

            Khi c\u00e1c \u1ee9ng d\u1ee5ng ph\u00e1t tri\u1ec3n, y\u00eau c\u1ea7u v\u1ec1 d\u1eef li\u1ec7u c\u0169ng thay \u0111\u1ed5i. B\u1ea1n c\u00f3 th\u1ec3 c\u1ea7n t\u00e1ch m\u1ed9t b\u1ea3ng ho\u1eb7c h\u1ee3p nh\u1ea5t hai th\u1ef1c th\u1ec3. ERD cho ph\u00e9p b\u1ea1n h\u00ecnh dung t\u00e1c \u0111\u1ed9ng c\u1ee7a nh\u1eefng thay \u0111\u1ed5i n\u00e0y \u0111\u1ed1i v\u1edbi c\u00e1c m\u1ed1i quan h\u1ec7 hi\u1ec7n c\u00f3. N\u00f3 gi\u00fap ng\u0103n ng\u1eeba vi\u1ec7c l\u00e0m h\u1ecfng c\u00e1c truy v\u1ea5n d\u1ef1a tr\u00ean c\u00e1c r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i c\u1ee5 th\u1ec3.<\/p>\n

            3. T\u1ed1i \u01b0u h\u00f3a truy v\u1ea5n ph\u1ee9c t\u1ea1p<\/h3>\n

            Khi c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 hi\u1ec7u su\u1ea5t ph\u00e1t sinh, vi\u1ec7c hi\u1ec3u c\u1ea5u tr\u00fac d\u1eef li\u1ec7u l\u00e0 v\u00f4 c\u00f9ng quan tr\u1ecdng. N\u1ebfu c\u00e1c ph\u00e9p n\u1ed1i (join) ch\u1eadm, ERD gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c ch\u1ec9 m\u1ee5c b\u1ecb thi\u1ebfu ho\u1eb7c c\u00e1c b\u1ea3ng \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a k\u00e9m. N\u00f3 cung c\u1ea5p b\u1ea3n \u0111\u1ed3 c\u1ea7n thi\u1ebft \u0111\u1ec3 tinh ch\u1ec9nh \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/p>\n

            4. Qu\u1ea3n tr\u1ecb v\u00e0 tu\u00e2n th\u1ee7 d\u1eef li\u1ec7u<\/h3>\n

            C\u00e1c quy \u0111\u1ecbnh th\u01b0\u1eddng y\u00eau c\u1ea7u hi\u1ec3u r\u00f5 d\u1eef li\u1ec7u n\u1eb1m \u1edf \u0111\u00e2u v\u00e0 ch\u00fang li\u00ean quan nh\u01b0 th\u1ebf n\u00e0o. ERD cung c\u1ea5p m\u1ed9t danh m\u1ee5c r\u00f5 r\u00e0ng c\u00e1c t\u00e0i s\u1ea3n d\u1eef li\u1ec7u. N\u00f3 gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c tr\u01b0\u1eddng nh\u1ea1y c\u1ea3m (PII) v\u00e0 c\u00e1ch ch\u00fang \u0111\u01b0\u1ee3c li\u00ean k\u1ebft trong to\u00e0n h\u1ec7 th\u1ed1ng, \u0111i\u1ec1u n\u00e0y r\u1ea5t c\u1ea7n thi\u1ebft cho vi\u1ec7c ki\u1ec3m to\u00e1n.<\/p>\n

            5. M\u00f4i tr\u01b0\u1eddng \u0111a c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/h3>\n

            Trong c\u00e1c ki\u1ebfn tr\u00fac l\u01b0u tr\u1eef \u0111a ng\u00f4n ng\u1eef (polyglot persistence) n\u01a1i d\u1eef li\u1ec7u kh\u00e1c nhau \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong c\u00e1c h\u1ec7 th\u1ed1ng kh\u00e1c nhau (v\u00ed d\u1ee5: SQL cho giao d\u1ecbch, NoSQL cho danh m\u1ee5c), ERD gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c ranh gi\u1edbi logic c\u1ee7a t\u1eebng kho l\u01b0u tr\u1eef. N\u00f3 l\u00e0m r\u00f5 d\u1eef li\u1ec7u n\u00e0o thu\u1ed9c v\u1ec1 \u0111\u00e2u.<\/p>\n

            \ud83d\ude80 Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng Bi\u1ec3u \u0111\u1ed3 lu\u1ed3ng d\u1eef li\u1ec7u<\/h2>\n

            DFD ph\u00e1t huy hi\u1ec7u qu\u1ea3 khi s\u1ef1 ph\u1ee9c t\u1ea1p n\u1eb1m \u1edf logic ch\u1ee9 kh\u00f4ng ph\u1ea3i \u1edf vi\u1ec7c l\u01b0u tr\u1eef. \u0110\u00e2y l\u00e0 c\u00f4ng c\u1ee5 \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn \u0111\u1ec3 \u00e1nh x\u1ea1 h\u00e0nh vi c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

            1. Thi\u1ebft k\u1ebf v\u00e0 t\u00e0i li\u1ec7u h\u00f3a API<\/h3>\n

            Tr\u01b0\u1edbc khi vi\u1ebft m\u00e3 cho m\u1ed9t \u0111i\u1ec3m cu\u1ed1i (endpoint), DFD l\u00e0m r\u00f5 \u0111\u1ea7u v\u00e0o c\u1ea7n thi\u1ebft l\u00e0 g\u00ec v\u00e0 \u0111\u1ea7u ra tr\u1ea3 v\u1ec1 l\u00e0 g\u00ec. N\u00f3 gi\u00fap x\u00e1c \u0111\u1ecbnh h\u1ee3p \u0111\u1ed3ng gi\u1eefa kh\u00e1ch h\u00e0ng v\u00e0 m\u00e1y ch\u1ee7. N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c tr\u01b0\u1eddng d\u1eef li\u1ec7u b\u1eaft bu\u1ed9c \u0111\u1ec1u \u0111\u01b0\u1ee3c t\u00ednh \u0111\u1ebfn trong y\u00eau c\u1ea7u v\u00e0 ph\u1ea3n h\u1ed3i.<\/p>\n

            2. Ki\u1ebfn tr\u00fac vi d\u1ecbch v\u1ee5<\/h3>\n

            Khi t\u00e1ch m\u1ed9t h\u1ec7 th\u1ed1ng \u0111\u01a1n kh\u1ed1i (monolith) th\u00e0nh c\u00e1c vi d\u1ecbch v\u1ee5, DFD \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh ranh gi\u1edbi d\u1ecbch v\u1ee5. N\u00f3 cho th\u1ea5y d\u1eef li\u1ec7u di chuy\u1ec3n gi\u1eefa c\u00e1c d\u1ecbch v\u1ee5 nh\u01b0 th\u1ebf n\u00e0o th\u00f4ng qua API ho\u1eb7c h\u00e0ng \u0111\u1ee3i tin nh\u1eafn. N\u00f3 gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m gh\u00e9p n\u1ed1i n\u01a1i c\u00e1c d\u1ecbch v\u1ee5 ph\u1ee5 thu\u1ed9c qu\u00e1 nhi\u1ec1u v\u00e0o nhau.<\/p>\n

            3. ETL v\u00e0 \u0111\u01b0\u1eddng \u1ed1ng d\u1eef li\u1ec7u<\/h3>\n

            K\u1ef9 thu\u1eadt d\u1eef li\u1ec7u ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o lu\u1ed3ng. DFD \u00e1nh x\u1ea1 h\u00e0nh tr\u00ecnh c\u1ee7a d\u1eef li\u1ec7u t\u1eeb vi\u1ec7c thu th\u1eadp, chuy\u1ec3n \u0111\u1ed5i \u0111\u1ebfn t\u1ea3i. N\u00f3 gi\u00fap x\u00e1c \u0111\u1ecbnh n\u01a1i d\u1eef li\u1ec7u c\u00f3 th\u1ec3 b\u1ecb m\u1ea5t, tr\u00f9ng l\u1eb7p ho\u1eb7c b\u1ecb h\u1ecfng trong qu\u00e1 tr\u00ecnh v\u1eadn chuy\u1ec3n.<\/p>\n

            4. Ki\u1ec3m to\u00e1n b\u1ea3o m\u1eadt<\/h3>\n

            C\u00e1c nh\u00f3m b\u1ea3o m\u1eadt c\u1ea7n bi\u1ebft d\u1eef li\u1ec7u di chuy\u1ec3n nh\u01b0 th\u1ebf n\u00e0o. DFD l\u00e0m n\u1ed5i b\u1eadt n\u01a1i d\u1eef li\u1ec7u b\u1ecb ph\u01a1i b\u00e0y cho c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i ho\u1eb7c d\u1ecbch v\u1ee5 b\u00ean th\u1ee9 ba. N\u00f3 gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m n\u01a1i c\u1ea7n m\u00e3 h\u00f3a ho\u1eb7c n\u01a1i c\u1ea7n th\u1ef1c thi c\u00e1c ki\u1ec3m so\u00e1t truy c\u1eadp.<\/p>\n

            5. T\u1ef1 \u0111\u1ed9ng h\u00f3a quy tr\u00ecnh l\u00e0m vi\u1ec7c<\/h3>\n

            \u0110\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng k\u00edch ho\u1ea1t h\u00e0nh \u0111\u1ed9ng d\u1ef1a tr\u00ean s\u1ef1 ki\u1ec7n (v\u00ed d\u1ee5: g\u1eedi email sau khi \u0111\u01a1n h\u00e0ng \u0111\u01b0\u1ee3c \u0111\u1eb7t), DFD \u00e1nh x\u1ea1 tr\u00ecnh t\u1ef1 c\u00e1c s\u1ef1 ki\u1ec7n. N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c b\u01b0\u1edbc c\u1ea7n thi\u1ebft \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t theo \u0111\u00fang th\u1ee9 t\u1ef1.<\/p>\n

            \ud83d\udd17 T\u00edch h\u1ee3p ERD v\u00e0 DFD trong ph\u00e1t tri\u1ec3n Backend<\/h2>\n

            Trong th\u1ef1c t\u1ebf, ph\u00e1t tri\u1ec3n backend hi\u1ebfm khi s\u1eed d\u1ee5ng ch\u1ec9 m\u1ed9t lo\u1ea1i bi\u1ec3u \u0111\u1ed3 duy nh\u1ea5t. C\u00e1c h\u1ec7 th\u1ed1ng v\u1eefng ch\u1eafc nh\u1ea5t \u0111\u1ec1u s\u1eed d\u1ee5ng c\u1ea3 hai. Ch\u00fang b\u1ed5 sung cho nhau. ERD \u0111\u1ecbnh ngh\u0129a khung ch\u1ee9a, c\u00f2n DFD \u0111\u1ecbnh ngh\u0129a ho\u1ea1t \u0111\u1ed9ng b\u00ean trong khung ch\u1ee9a \u0111\u00f3.<\/p>\n

            Quy tr\u00ecnh thi\u1ebft k\u1ebf<\/h3>\n
              \n
            1. X\u00e1c \u0111\u1ecbnh mi\u1ec1n (domain):<\/strong>X\u00e1c \u0111\u1ecbnh c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn b\u1ea3n ph\u00e1c th\u1ea3o ERD ban \u0111\u1ea7u.<\/li>\n
            2. \u00c1nh x\u1ea1 c\u00e1c quy tr\u00ecnh:<\/strong>X\u00e1c \u0111\u1ecbnh c\u00e1ch ng\u01b0\u1eddi d\u00f9ng t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra DFD c\u1ea5p \u0111\u1ed9 0.<\/li>\n
            3. Tinh ch\u1ec9nh S\u01a1 \u0111\u1ed3:<\/strong>\u0110i\u1ec1u ch\u1ec9nh ERD d\u1ef1a tr\u00ean c\u00e1c y\u00eau c\u1ea7u t\u00ecm th\u1ea5y trong DFD. V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t quy tr\u00ecnh y\u00eau c\u1ea7u t\u00ecm ki\u1ebfm th\u01b0\u1eddng xuy\u00ean theo m\u1ed9t tr\u01b0\u1eddng c\u1ee5 th\u1ec3, h\u00e3y th\u00eam ch\u1ec9 m\u1ee5c v\u00e0o ERD.<\/li>\n
            4. Chi ti\u1ebft h\u00f3a Logic:<\/strong>Ph\u00e2n r\u00e3 c\u00e1c quy tr\u00ecnh DFD th\u00e0nh s\u01a1 \u0111\u1ed3 C\u1ea5p \u0111\u1ed9 1 v\u00e0 C\u1ea5p \u0111\u1ed9 2. \u0110i\u1ec1u n\u00e0y x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m cu\u1ed1i API v\u00e0 logic d\u1ecbch v\u1ee5.<\/li>\n
            5. Tri\u1ec3n khai v\u00e0 L\u1eb7p l\u1ea1i:<\/strong>Khi m\u00e3 \u0111\u01b0\u1ee3c vi\u1ebft, h\u00e3y c\u1eadp nh\u1eadt c\u1ea3 hai s\u01a1 \u0111\u1ed3 \u0111\u1ec3 ph\u1ea3n \u00e1nh th\u1ef1c t\u1ebf. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o t\u00e0i li\u1ec7u lu\u00f4n \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt.<\/li>\n<\/ol>\n

              X\u1eed l\u00fd c\u00e1c xung \u0111\u1ed9t<\/h3>\n

              \u0110\u00f4i khi, c\u00e1c y\u00eau c\u1ea7u v\u1ec1 lu\u1ed3ng xung \u0111\u1ed9t v\u1edbi c\u00e1c y\u00eau c\u1ea7u v\u1ec1 c\u1ea5u tr\u00fac. V\u00ed d\u1ee5, m\u1ed9t DFD c\u00f3 th\u1ec3 g\u1ee3i \u00fd m\u1ed9t m\u1ed1i quan h\u1ec7 nhi\u1ec1u-nhi\u1ec1u \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u00ednh linh ho\u1ea1t cao, nh\u01b0ng m\u1ed9t ERD c\u00f3 th\u1ec3 chu\u1ea9n h\u00f3a n\u00f3 \u0111\u1ec3 gi\u1ea3m s\u1ef1 d\u01b0 th\u1eeba. Trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0y, c\u1ea7n ph\u1ea3i c\u00f3 ph\u00e2n t\u00edch \u0111\u00e1nh \u0111\u1ed5i.<\/p>\n

                \n
              • H\u1ec7 th\u1ed1ng n\u1eb7ng v\u1ec1 \u0111\u1ecdc:<\/strong>\u01afu ti\u00ean ERD cho vi\u1ec7c phi chu\u1ea9n h\u00f3a \u0111\u1ec3 t\u0103ng t\u1ed1c \u0111\u1ed9 \u0111\u1ecdc.<\/li>\n
              • H\u1ec7 th\u1ed1ng n\u1eb7ng v\u1ec1 ghi:<\/strong>\u01afu ti\u00ean ERD cho vi\u1ec7c chu\u1ea9n h\u00f3a \u0111\u1ec3 gi\u1ea3m thi\u1ec3u \u0111\u1ed9 ph\u1ee9c t\u1ea1p khi ghi v\u00e0 s\u1ef1 d\u01b0 th\u1eeba.<\/li>\n
              • Th\u00f4ng l\u01b0\u1ee3ng cao:<\/strong>\u01afu ti\u00ean DFD cho x\u1eed l\u00fd b\u1ea5t \u0111\u1ed3ng b\u1ed9 \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c \u0111\u1ec9nh t\u1ea3i.<\/li>\n<\/ul>\n

                \u26a0\ufe0f Nh\u1eefng c\u1ea1m b\u1eaby ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh<\/h2>\n

                Ngay c\u1ea3 c\u00e1c k\u1ef9 s\u01b0 c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc l\u1ed7i khi m\u00f4 h\u00ecnh h\u00f3a. Vi\u1ec7c nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c c\u00e1c b\u1eaby ph\u1ed5 bi\u1ebfn c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m \u0111\u00e1ng k\u1ec3 th\u1eddi gian trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n.<\/p>\n

                1. K\u1ef9 thu\u1eadt h\u00f3a qu\u00e1 m\u1ee9c ERD<\/h3>\n

                Vi\u1ec7c c\u1ed1 g\u1eafng d\u1ef1 \u0111o\u00e1n m\u1ecdi y\u00eau c\u1ea7u trong t\u01b0\u01a1ng lai d\u1eabn \u0111\u1ebfn m\u1ed9t s\u01a1 \u0111\u1ed3 qu\u00e1 c\u1ee9ng nh\u1eafc. T\u1ed1t h\u01a1n l\u00e0 thi\u1ebft k\u1ebf cho c\u00e1c y\u00eau c\u1ea7u hi\u1ec7n t\u1ea1i v\u00e0 s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 di chuy\u1ec3n \u0111\u1ec3 ph\u00e1t tri\u1ec3n s\u01a1 \u0111\u1ed3 sau n\u00e0y. Tr\u00e1nh t\u1ea1o c\u00e1c b\u1ea3ng cho c\u00e1c t\u00ednh n\u0103ng gi\u1ea3 \u0111\u1ecbnh.<\/p>\n

                2. B\u1ecf qua c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u trong ERD<\/h3>\n

                M\u1ed9t ERD kh\u00f4ng ch\u1ec9 v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3; n\u00f3 c\u00f2n v\u1ec1 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u. Vi\u1ec7c ch\u1ecdn sai ki\u1ec3u (v\u00ed d\u1ee5: s\u1eed d\u1ee5ng chu\u1ed7i cho ng\u00e0y th\u00e1ng) g\u00e2y ra c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 ph\u00ecnh to b\u1ed9 l\u01b0u tr\u1eef. \u0110\u1ea3m b\u1ea3o ERD x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u.<\/p>\n

                3. Thi\u1ebfu c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i trong DFD<\/h3>\n

                Vi\u1ec7c qu\u00ean c\u00e1c d\u1ecbch v\u1ee5 b\u00ean th\u1ee9 ba l\u00e0 \u0111i\u1ec1u ph\u1ed5 bi\u1ebfn. N\u1ebfu h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n d\u1ef1a v\u00e0o c\u1ed5ng thanh to\u00e1n ho\u1eb7c d\u1ecbch v\u1ee5 email, nh\u1eefng th\u1ee9 n\u00e0y ph\u1ea3i xu\u1ea5t hi\u1ec7n d\u01b0\u1edbi d\u1ea1ng c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i trong DFD. Vi\u1ec7c qu\u00ean ch\u00fang d\u1eabn \u0111\u1ebfn logic t\u00edch h\u1ee3p kh\u00f4ng \u0111\u1ea7y \u0111\u1ee7.<\/p>\n

                4. Lu\u1ed3ng d\u1eef li\u1ec7u tu\u1ea7n ho\u00e0n<\/h3>\n

                Trong m\u1ed9t DFD, h\u00e3y \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u ch\u1ea3y m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd. C\u00e1c ph\u1ee5 thu\u1ed9c tu\u1ea7n ho\u00e0n gi\u1eefa c\u00e1c quy tr\u00ecnh c\u00f3 th\u1ec3 ch\u1ec9 ra m\u1ed9t l\u1ed7i thi\u1ebft k\u1ebf ho\u1eb7c t\u00ecnh tr\u1ea1ng ch\u1ebft c\u1ee9ng trong logic ph\u00eda sau.<\/p>\n

                5. Quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean kh\u00f4ng nh\u1ea5t qu\u00e1n<\/h3>\n

                S\u1eed d\u1ee5ng thu\u1eadt ng\u1eef nh\u1ea5t qu\u00e1n tr\u00ean c\u1ea3 hai s\u01a1 \u0111\u1ed3. N\u1ebfu ERD g\u1ecdi m\u1ed9t tr\u01b0\u1eddng l\u00e0 “user_id\"<\/code>“, lu\u1ed3ng DFD n\u00ean tham chi\u1ebfu \u0111\u1ebfn “User ID\".<\/code> S\u1ef1 kh\u00f4ng nh\u1ea5t qu\u00e1n g\u00e2y ra s\u1ef1 nh\u1ea7m l\u1eabn cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n \u0111\u1ecdc t\u00e0i li\u1ec7u.<\/p>\n

                6. DFD t\u0129nh<\/h3>\n

                M\u1ed9t DFD kh\u00f4ng t\u00ednh \u0111\u1ebfn x\u1eed l\u00fd l\u1ed7i ho\u1eb7c logic th\u1eed l\u1ea1i l\u00e0 ch\u01b0a ho\u00e0n ch\u1ec9nh. C\u00e1c h\u1ec7 th\u1ed1ng backend ph\u1ea3i x\u1eed l\u00fd c\u00e1c l\u1ed7i x\u1ea3y ra. H\u00e3y th\u00eam c\u00e1c lu\u1ed3ng cho th\u00f4ng b\u00e1o l\u1ed7i v\u00e0 quy tr\u00ecnh ho\u00e0n t\u00e1c v\u00e0o s\u01a1 \u0111\u1ed3.<\/p>\n

                \ud83d\udcdd C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho t\u00e0i li\u1ec7u<\/h2>\n

                \u0110\u1ec3 duy tr\u00ec gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, h\u00e3y tu\u00e2n th\u1ee7 c\u00e1c th\u1ef1c h\u00e0nh b\u1ea3o tr\u00ec sau.<\/p>\n

                  \n
                • Ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n:<\/strong>H\u00e3y coi c\u00e1c s\u01a1 \u0111\u1ed3 nh\u01b0 m\u00e3 ngu\u1ed3n. L\u01b0u tr\u1eef ch\u00fang trong kho l\u01b0u tr\u1eef c\u1ee7a b\u1ea1n. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p b\u1ea1n theo d\u00f5i c\u00e1c thay \u0111\u1ed5i theo th\u1eddi gian v\u00e0 ho\u00e0n t\u00e1c n\u1ebfu c\u1ea7n.<\/li>\n
                • T\u1ef1 \u0111\u1ed9ng h\u00f3a vi\u1ec7c t\u1ea1o:<\/strong>Khi c\u00f3 th\u1ec3, h\u00e3y t\u1ea1o ERD t\u1eeb l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u1ef1c t\u1ebf. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o t\u00e0i li\u1ec7u kh\u1edbp v\u1edbi m\u00e3 ngu\u1ed3n. C\u00e1c c\u00f4ng c\u1ee5 hi\u1ec7n c\u00f3 \u0111\u1ec3 ph\u00e2n t\u00edch ng\u01b0\u1ee3c c\u00e1c k\u1ecbch b\u1ea3n SQL th\u00e0nh c\u00e1c s\u01a1 \u0111\u1ed3 tr\u1ef1c quan.<\/li>\n
                • Gi\u1eef cho \u0111\u01a1n gi\u1ea3n:<\/strong>M\u1ed9t s\u01a1 \u0111\u1ed3 qu\u00e1 ph\u1ee9c t\u1ea1p s\u1ebd tr\u1edf n\u00ean v\u00f4 d\u1ee5ng. H\u00e3y s\u1eed d\u1ee5ng nh\u00f3m h\u00f3a v\u00e0 ph\u00e2n r\u00e3 \u0111\u1ec3 qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p. \u0110\u1eebng hi\u1ec3n th\u1ecb t\u1eebng cu\u1ed9c g\u1ecdi API ri\u00eang l\u1ebb trong s\u01a1 \u0111\u1ed3 c\u1ea5p \u0111\u1ed9 1.<\/li>\n
                • Xem x\u00e9t th\u01b0\u1eddng xuy\u00ean:<\/strong>Trong qu\u00e1 tr\u00ecnh l\u1eadp k\u1ebf ho\u1ea1ch sprint ho\u1eb7c xem x\u00e9t ki\u1ebfn tr\u00fac, h\u00e3y c\u1eadp nh\u1eadt c\u00e1c s\u01a1 \u0111\u1ed3. N\u1ebfu m\u1ed9t t\u00ednh n\u0103ng \u0111\u01b0\u1ee3c th\u00eam v\u00e0o, c\u00e1c s\u01a1 \u0111\u1ed3 ph\u1ea3i ph\u1ea3n \u00e1nh \u0111i\u1ec1u \u0111\u00f3.<\/li>\n
                • H\u1ee3p t\u00e1c:<\/strong>H\u00e3y tham gia c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n, qu\u1ea3n tr\u1ecb vi\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u (DBA) v\u00e0 qu\u1ea3n l\u00fd s\u1ea3n ph\u1ea9m v\u00e0o quy tr\u00ecnh v\u1ebd s\u01a1 \u0111\u1ed3. C\u00e1c g\u00f3c nh\u00ecn kh\u00e1c nhau s\u1ebd ph\u00e1t hi\u1ec7n ra c\u00e1c l\u1ed7i kh\u00e1c nhau.<\/li>\n<\/ul>\n

                  \ud83d\udee0\ufe0f C\u00e1c c\u00e2n nh\u1eafc k\u1ef9 thu\u1eadt cho nh\u00f3m backend<\/h2>\n

                  Khi tri\u1ec3n khai c\u00e1c m\u00f4 h\u00ecnh n\u00e0y, h\u00e3y c\u00e2n nh\u1eafc \u0111\u1ebfn c\u00f4ng ngh\u1ec7 (tech stack).<\/p>\n

                  Quan h\u1ec7 so v\u1edbi NoSQL<\/h3>\n

                  M\u1eb7c d\u00f9 ERD truy\u1ec1n th\u1ed1ng th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7, ch\u00fang v\u1eabn h\u1eefu \u00edch cho NoSQL. Trong c\u00e1c kho l\u01b0u tr\u1eef t\u00e0i li\u1ec7u, ERD \u00e1nh x\u1ea1 \u0111\u1ebfn c\u1ea5u tr\u00fac c\u1ee7a l\u01b0\u1ee3c \u0111\u1ed3 t\u00e0i li\u1ec7u. Trong c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ed3 th\u1ecb, ERD \u00e1nh x\u1ea1 tr\u1ef1c ti\u1ebfp \u0111\u1ebfn c\u00e1c n\u00fat v\u00e0 c\u1ea1nh. C\u00e1c nguy\u00ean t\u1eafc v\u1ec1 m\u1ed1i quan h\u1ec7 v\u1eabn \u0111\u00fang b\u1ea5t k\u1ec3 c\u00f4ng c\u1ee5 l\u01b0u tr\u1eef n\u00e0o.<\/p>\n

                  Vi d\u1ecbch v\u1ee5 v\u00e0 h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n<\/h3>\n

                  Trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n, DFD tr\u1edf n\u00ean quan tr\u1ecdng h\u01a1n bao gi\u1edd h\u1ebft. N\u00f3 ph\u1ea3i th\u1ec3 hi\u1ec7n c\u00e1c ranh gi\u1edbi m\u1ea1ng. D\u00f2ng d\u1eef li\u1ec7u ch\u1ea1y qua m\u1ea1ng g\u00e2y ra \u0111\u1ed9 tr\u1ec5 v\u00e0 r\u1ee7i ro b\u1ea3o m\u1eadt. DFD gi\u00fap x\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed \u0111\u1eb7t c\u00e1c l\u1edbp b\u1ed9 nh\u1edb \u0111\u1ec7m ho\u1eb7c b\u1ed9 chuy\u1ec3n m\u1ea1ch tin nh\u1eafn \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t.<\/p>\n

                  Ki\u1ebfn tr\u00fac h\u01b0\u1edbng s\u1ef1 ki\u1ec7n<\/h3>\n

                  C\u00e1c backend hi\u1ec7n \u0111\u1ea1i th\u01b0\u1eddng s\u1eed d\u1ee5ng lu\u1ed3ng s\u1ef1 ki\u1ec7n. DFD ph\u1ea3i bi\u1ec3u di\u1ec5n c\u00e1c lu\u1ed3ng n\u00e0y. Thay v\u00ec c\u00e1c lu\u1ed3ng tr\u1ef1c ti\u1ebfp t\u1eeb quy tr\u00ecnh n\u00e0y sang quy tr\u00ecnh kh\u00e1c, d\u1eef li\u1ec7u s\u1ebd ch\u1ea3y qua m\u1ed9t bus ho\u1eb7c b\u1ed9 chuy\u1ec3n m\u1ea1ch. ERD ph\u1ea3i bi\u1ec3u di\u1ec5n l\u01b0\u1ee3c \u0111\u1ed3 c\u1ee7a c\u00e1c s\u1ef1 ki\u1ec7n \u0111ang \u0111\u01b0\u1ee3c xu\u1ea5t b\u1ea3n v\u00e0 ti\u00eau th\u1ee5.<\/p>\n

                  \ud83d\udcc8 \u0110o l\u01b0\u1eddng th\u00e0nh c\u00f4ng<\/h2>\n

                  L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 bi\u1ebft m\u00f4 h\u00ecnh h\u00f3a c\u1ee7a b\u1ea1n c\u00f3 hi\u1ec7u qu\u1ea3? H\u00e3y t\u00ecm ki\u1ebfm c\u00e1c ch\u1ec9 s\u1ed1 sau:<\/p>\n

                    \n
                  • Gi\u1ea3m th\u1eddi gian h\u1ed9i nh\u1eadp:<\/strong>C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n m\u1edbi hi\u1ec3u h\u1ec7 th\u1ed1ng nhanh h\u01a1n khi c\u00f3 s\u01a1 \u0111\u1ed3.<\/li>\n
                  • \u00cdt l\u1ed7i d\u1eef li\u1ec7u h\u01a1n:<\/strong>M\u1ed9t ERD r\u00f5 r\u00e0ng d\u1eabn \u0111\u1ebfn \u00edt vi ph\u1ea1m r\u00e0ng bu\u1ed9c h\u01a1n trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t.<\/li>\n
                  • H\u1ee3p \u0111\u1ed3ng API r\u00f5 r\u00e0ng h\u01a1n:<\/strong>M\u1ed9t DFD r\u00f5 r\u00e0ng d\u1eabn \u0111\u1ebfn \u00edt hi\u1ec3u l\u1ea7m h\u01a1n gi\u1eefa c\u00e1c nh\u00f3m frontend v\u00e0 backend.<\/li>\n
                  • Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng:<\/strong>Ki\u1ebfn tr\u00fac n\u00e0y h\u1ed7 tr\u1ee3 s\u1ef1 ph\u00e1t tri\u1ec3n m\u00e0 kh\u00f4ng y\u00eau c\u1ea7u vi\u1ebft l\u1ea1i ho\u00e0n to\u00e0n l\u1edbp d\u1eef li\u1ec7u.<\/li>\n<\/ul>\n

                    \ud83c\udfc1 Nh\u1eefng c\u00e2n nh\u1eafc cu\u1ed1i c\u00f9ng<\/h2>\n

                    Vi\u1ec7c l\u1ef1a ch\u1ecdn gi\u1eefa S\u01a1 \u0111\u1ed3 Quan h\u1ec7 Th\u1ef1c th\u1ec3 (ERD) v\u00e0 S\u01a1 \u0111\u1ed3 Lu\u1ed3ng D\u1eef li\u1ec7u (DFD) kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh lo\u1ea1i tr\u1eeb l\u1eabn nhau. \u0110\u00f3 l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn chi\u1ebfn l\u01b0\u1ee3c d\u1ef1a tr\u00ean giai \u0111o\u1ea1n hi\u1ec7n t\u1ea1i c\u1ee7a qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n. ERD \u0111\u1eb7t n\u1ec1n t\u1ea3ng cho h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n d\u1ef1a tr\u00ean th\u1ef1c t\u1ebf, \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef ch\u00ednh x\u00e1c. DFD h\u01b0\u1edbng d\u1eabn h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n th\u1ef1c hi\u1ec7n m\u1ee5c \u0111\u00edch c\u1ee7a n\u00f3, \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c x\u1eed l\u00fd hi\u1ec7u qu\u1ea3.<\/p>\n

                    B\u1eb1ng c\u00e1ch th\u00e0nh th\u1ea1o c\u1ea3 hai, k\u1ef9 s\u01b0 backend c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng kh\u00f4ng ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t m\u00e0 c\u00f2n d\u1ec5 b\u1ea3o tr\u00ec v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng. T\u00e0i li\u1ec7u h\u00f3a l\u00e0 m\u1ed9t kho\u1ea3n \u0111\u1ea7u t\u01b0. Th\u1eddi gian d\u00e0nh ra \u0111\u1ec3 t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch khi x\u1eed l\u00fd s\u1ef1 c\u1ed1, m\u1edf r\u1ed9ng quy m\u00f4 ho\u1eb7c vi\u1ebft l\u1ea1i m\u00e3. H\u00e3y gi\u1eef cho c\u00e1c m\u00f4 h\u00ecnh c\u1ee7a b\u1ea1n ch\u00ednh x\u00e1c, gi\u1eef cho c\u00e1c s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n s\u1ea1ch s\u1ebd, v\u00e0 \u0111\u1ec3 c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n h\u1ed7 tr\u1ee3 lu\u1ed3ng logic c\u1ee7a b\u1ea1n.<\/p>\n

                    H\u00e3y nh\u1edb, m\u1ee5c ti\u00eau l\u00e0 s\u1ef1 r\u00f5 r\u00e0ng. D\u00f9 b\u1ea1n \u0111ang \u00e1nh x\u1ea1 c\u00e1c b\u1ea3ng hay c\u00e1c quy tr\u00ecnh, m\u1ee5c \u0111\u00edch t\u1ed1i th\u01b0\u1ee3ng l\u00e0 gi\u1ea3m thi\u1ec3u s\u1ef1 m\u01a1 h\u1ed3 v\u00e0 \u0111\u1ea3m b\u1ea3o m\u1ecdi b\u00ean li\u00ean quan \u0111\u1ec1u hi\u1ec3u r\u00f5 ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng. \ud83d\ude80<\/p>\n","protected":false},"excerpt":{"rendered":"

                    Ki\u1ebfn tr\u00fac Backend d\u1ef1a v\u00e0o t\u00e0i li\u1ec7u ch\u00ednh x\u00e1c \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3. Kh\u00f4ng c\u00f3 c\u00e1c bi\u1ec3u di\u1ec5n tr\u1ef1c quan r\u00f5 r\u00e0ng v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef…<\/p>\n","protected":false},"author":1,"featured_media":364,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"S\u01a1 \u0111\u1ed3 ER so v\u1edbi S\u01a1 \u0111\u1ed3 Lu\u1ed3ng D\u1eef li\u1ec7u: H\u01b0\u1edbng d\u1eabn Ki\u1ebfn tr\u00fac Backend","_yoast_wpseo_metadesc":"T\u00ecm hi\u1ec3u khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 ER so v\u1edbi s\u01a1 \u0111\u1ed3 Lu\u1ed3ng D\u1eef li\u1ec7u cho ki\u1ebfn tr\u00fac backend. M\u1ed9t h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt v\u1ec1 thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 so v\u1edbi m\u00f4 h\u00ecnh h\u00f3a quy tr\u00ecnh cho c\u00e1c h\u1ec7 th\u1ed1ng v\u1eefng ch\u1eafc.","inline_featured_image":false,"source_url":"","fifu_image_url":"","fifu_image_alt":"","_fifu_image_alt":"","fifu_alt":"","_fifu_alt":"","fifu_image_title":"","_fifu_image_title":"","fifu_input_alt":"","vp_image_hash":"","footnotes":""},"categories":[6],"tags":[10,11],"asset-category":[],"class_list":["post-363","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-erd","tag-academic","tag-erd"],"source_url":"","fifu_image_url":"","fifu_image_alt":"","vp_image_hash":"","yoast_head":"\nS\u01a1 \u0111\u1ed3 ER so v\u1edbi S\u01a1 \u0111\u1ed3 Lu\u1ed3ng D\u1eef li\u1ec7u: H\u01b0\u1edbng d\u1eabn Ki\u1ebfn tr\u00fac Backend<\/title>\n<meta name=\"description\" content=\"T\u00ecm hi\u1ec3u khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 ER so v\u1edbi s\u01a1 \u0111\u1ed3 Lu\u1ed3ng D\u1eef li\u1ec7u cho ki\u1ebfn tr\u00fac backend. 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