{"id":57,"date":"2026-04-06T14:14:22","date_gmt":"2026-04-06T14:14:22","guid":{"rendered":"https:\/\/www.we-notes.com\/vn\/er-diagrams-senior-developers-abstraction-implementation\/"},"modified":"2026-04-06T14:14:22","modified_gmt":"2026-04-06T14:14:22","slug":"er-diagrams-senior-developers-abstraction-implementation","status":"publish","type":"post","link":"https:\/\/www.we-notes.com\/vn\/er-diagrams-senior-developers-abstraction-implementation\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 ER cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao: C\u00e2n b\u1eb1ng gi\u1eefa tr\u1eebu t\u01b0\u1ee3ng v\u00e0 th\u1ef1c t\u1ebf tri\u1ec3n khai"},"content":{"rendered":"

S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) th\u01b0\u1eddng b\u1ecb m\u1ed9t s\u1ed1 ng\u01b0\u1eddi coi l\u00e0 nh\u1eefng b\u00e0i t\u1eadp h\u1ecdc thu\u1eadt ho\u1eb7c t\u00e0i li\u1ec7u \u0111\u01b0\u1ee3c t\u1ea1o ra ch\u1ec9 \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u t\u00e0i li\u1ec7u h\u00f3a. Tuy nhi\u00ean, \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao v\u00e0 ki\u1ebfn tr\u00fac s\u01b0, s\u01a1 \u0111\u1ed3 ER l\u00e0 b\u1ea3n \u0111\u1ed3 chi\u1ebfn l\u01b0\u1ee3c quy\u1ebft \u0111\u1ecbnh \u0111\u1ebfn \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh, hi\u1ec7u su\u1ea5t v\u00e0 kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec c\u1ee7a l\u1edbp d\u1eef li\u1ec7u trong \u1ee9ng d\u1ee5ng. Th\u00e1ch th\u1ee9c kh\u00f4ng n\u1eb1m \u1edf vi\u1ec7c v\u1ebd c\u00e1c h\u00ecnh h\u1ed9p v\u00e0 \u0111\u01b0\u1eddng k\u1ebb, m\u00e0 n\u1eb1m \u1edf vi\u1ec7c v\u01b0\u1ee3t qua s\u1ef1 m\u00e2u thu\u1eabn gi\u1eefa m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u l\u00fd thuy\u1ebft v\u00e0 nh\u1eefng r\u00e0ng bu\u1ed9c l\u1ed9n x\u1ed9n trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t.<\/p>\n

Khi x\u00e2y d\u1ef1ng h\u1ec7 th\u1ed1ng, b\u1ea1n lu\u00f4n ph\u1ea3i \u0111\u01b0a ra nh\u1eefng th\u1ecfa hi\u1ec7p. M\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a ho\u00e0n h\u1ea3o \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u nh\u01b0ng c\u00f3 th\u1ec3 g\u00e2y t\u1ed5n th\u1ea5t hi\u1ec7u su\u1ea5t trong c\u00e1c truy v\u1ea5n ph\u1ee9c t\u1ea1p. M\u1ed9t c\u1ea5u tr\u00fac kh\u00f4ng chu\u1ea9n h\u00f3a l\u00e0m t\u0103ng t\u1ed1c \u0111\u1ed9 \u0111\u1ecdc nh\u01b0ng l\u1ea1i t\u1ea1o ra s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 c\u00e1c b\u1ea5t th\u01b0\u1eddng khi c\u1eadp nh\u1eadt. M\u1ee5c ti\u00eau l\u00e0 t\u00ecm ra \u0111i\u1ec3m c\u00e2n b\u1eb1ng sao cho s\u01a1 \u0111\u1ed3 ph\u1ea3n \u00e1nh ch\u00ednh x\u00e1c l\u0129nh v\u1ef1c kinh doanh m\u00e0 kh\u00f4ng tr\u1edf th\u00e0nh g\u00e1nh n\u1eb7ng trong qu\u00e1 tr\u00ecnh tri\u1ec3n khai.<\/p>\n

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

B\u1ea3n ch\u1ea5t k\u00e9p c\u1ee7a s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 \ud83d\udcd0<\/h2>\n

Hi\u1ec3u \u0111\u01b0\u1ee3c chu k\u1ef3 s\u1ed1ng c\u1ee7a s\u01a1 \u0111\u1ed3 ER \u0111\u00f2i h\u1ecfi ph\u1ea3i nh\u1eadn ra r\u1eb1ng n\u00f3 ph\u1ee5c v\u1ee5 nhi\u1ec1u m\u1ee5c \u0111\u00edch kh\u00e1c nhau. N\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t h\u00ecnh \u1ea3nh t\u0129nh m\u00e0 l\u00e0 m\u1ed9t t\u00e0i li\u1ec7u s\u1ed1ng \u0111\u1ed9ng, thay \u0111\u1ed5i c\u00f9ng v\u1edbi ph\u1ea7n m\u1ec1m. C\u00f3 ba l\u1edbp tr\u1eebu t\u01b0\u1ee3ng ri\u00eang bi\u1ec7t c\u1ea7n \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd ri\u00eang bi\u1ec7t \u0111\u1ec3 tr\u00e1nh nh\u1ea7m l\u1eabn gi\u1eefa d\u1eef li\u1ec7u n\u00ean<\/em>tr\u00f4ng nh\u01b0 th\u1ebf n\u00e0o v\u00e0 \u0111i\u1ec1u m\u00e0 n\u00f3 th\u1ef1c s\u1ef1<\/em>tr\u00f4ng nh\u01b0 th\u1ebf n\u00e0o trong b\u1ed9 nh\u1edb.<\/p>\n

    \n
  • M\u00f4 h\u00ecnh kh\u00e1i ni\u1ec7m:<\/strong> L\u1edbp n\u00e0y t\u1eadp trung v\u00e0o c\u00e1c th\u1ef1c th\u1ec3 kinh doanh v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa ch\u00fang m\u00e0 kh\u00f4ng \u0111i s\u00e2u v\u00e0o chi ti\u1ebft k\u1ef9 thu\u1eadt. N\u00f3 tr\u1ea3 l\u1eddi nh\u1eefng c\u00e2u h\u1ecfi nh\u01b0 \u201cNg\u01b0\u1eddi d\u00f9ng l\u00e0 g\u00ec?\u201d v\u00e0 \u201cNg\u01b0\u1eddi d\u00f9ng li\u00ean h\u1ec7 v\u1edbi \u0111\u01a1n h\u00e0ng nh\u01b0 th\u1ebf n\u00e0o?\u201d. L\u1edbp n\u00e0y kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o c\u00f4ng ngh\u1ec7 c\u1ee5 th\u1ec3.<\/li>\n
  • M\u00f4 h\u00ecnh logic:<\/strong> \u1ede \u0111\u00e2y, b\u1ea1n gi\u1edbi thi\u1ec7u c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u, kh\u00f3a v\u00e0 quy t\u1eafc chu\u1ea9n h\u00f3a. B\u1ea1n x\u00e1c \u0111\u1ecbnh kh\u00f3a ch\u00ednh v\u00e0 kh\u00f3a ngo\u1ea1i, nh\u01b0ng ch\u01b0a cam k\u1ebft v\u1edbi b\u1ed9 l\u01b0u tr\u1eef hay chi\u1ebfn l\u01b0\u1ee3c l\u1eadp ch\u1ec9 m\u1ee5c c\u1ee5 th\u1ec3 c\u1ee7a m\u1ed9t h\u1ec7 qu\u1ea3n tr\u1ecb c\u01a1 s\u1edf d\u1eef li\u1ec7u n\u00e0o.<\/li>\n
  • M\u00f4 h\u00ecnh v\u1eadt l\u00fd:<\/strong> \u0110\u00e2y l\u00e0 th\u1ef1c t\u1ebf tri\u1ec3n khai. N\u00f3 bao g\u1ed3m t\u00ean b\u1ea3ng, ki\u1ec3u d\u1eef li\u1ec7u c\u1ed9t, chi\u1ebfn l\u01b0\u1ee3c ph\u00e2n v\u00f9ng, l\u1eadp ch\u1ec9 m\u1ee5c v\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c c\u1ee5 th\u1ec3 v\u1edbi h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1ee5c ti\u00eau. \u0110\u00e2y ch\u00ednh l\u00e0 n\u01a1i m\u00e0 m\u1ecdi th\u1ee9 \u0111\u01b0\u1ee3c ki\u1ec3m ch\u1ee9ng th\u1ef1c t\u1ebf.<\/li>\n<\/ul>\n

    S\u1ef1 nh\u1ea7m l\u1eabn th\u01b0\u1eddng x\u1ea3y ra khi ba l\u1edbp n\u00e0y b\u1ecb tr\u1ed9n l\u1eabn. M\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao bi\u1ebft r\u1eb1ng l\u1ed7i th\u01b0\u1eddng \u1ea9n n\u00e1u \u1edf m\u00f4 h\u00ecnh v\u1eadt l\u00fd. M\u1ed9t m\u1ed1i quan h\u1ec7 kh\u00e1i ni\u1ec7m \u201cnhi\u1ec1u-\u0111\u1ebfn-nhi\u1ec1u\u201d ph\u1ea3i \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i c\u1ee5 th\u1ec3 trong m\u00f4 h\u00ecnh v\u1eadt l\u00fd, th\u01b0\u1eddng \u0111\u00f2i h\u1ecfi c\u00e1c b\u1ea3ng li\u00ean k\u1ebft m\u00e0 kh\u00f4ng t\u1ed3n t\u1ea1i trong logic kinh doanh ban \u0111\u1ea7u.<\/p>\n

    C\u00e1c l\u1edbp tr\u1eebu t\u01b0\u1ee3ng trong m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u \ud83e\udde9<\/h2>\n

    Vi\u1ec7c qu\u1ea3n l\u00fd c\u00e1c l\u1edbp n\u00e0y \u0111\u00f2i h\u1ecfi s\u1ef1 k\u1ef7 lu\u1eadt. Khi m\u1ed9t b\u00ean li\u00ean quan y\u00eau c\u1ea7u m\u1ed9t t\u00ednh n\u0103ng, h\u1ecd m\u00f4 t\u1ea3 n\u00f3 b\u1eb1ng ng\u00f4n ng\u1eef kinh doanh. Nh\u00e0 ph\u00e1t tri\u1ec3n ph\u1ea3i chuy\u1ec3n \u0111\u1ed5i \u0111i\u1ec1u \u0111\u00f3 th\u00e0nh l\u01b0\u1ee3c \u0111\u1ed3 logic, r\u1ed3i cu\u1ed1i c\u00f9ng l\u00e0 l\u01b0\u1ee3c \u0111\u1ed3 v\u1eadt l\u00fd. B\u1ecf qua c\u00e1c b\u01b0\u1edbc n\u00e0y s\u1ebd d\u1eabn \u0111\u1ebfn n\u1ee3 k\u1ef9 thu\u1eadt.<\/p>\n

    1. M\u00f4 h\u00ecnh h\u00f3a kh\u00e1i ni\u1ec7m: Ng\u00f4n ng\u1eef kinh doanh<\/h3>\n

    \u1ede giai \u0111o\u1ea1n n\u00e0y, s\u01a1 \u0111\u1ed3 l\u00e0 c\u00f4ng c\u1ee5 giao ti\u1ebfp. N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng \u0111\u1ed9i k\u1ef9 thu\u1eadt v\u00e0 \u0111\u1ed9i s\u1ea3n ph\u1ea9m \u0111\u1ed3ng thu\u1eadn v\u1ec1 m\u00f4 h\u00ecnh l\u0129nh v\u1ef1c. N\u1ebfu s\u01a1 \u0111\u1ed3 cho th\u1ea5y m\u1ed9t \u201cKh\u00e1ch h\u00e0ng\u201d c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u \u201c\u0110\u1ecba ch\u1ec9\u201d, m\u1ecdi ng\u01b0\u1eddi \u0111\u1ec1u \u0111\u1ed3ng \u00fd v\u1edbi \u0111i\u1ec1u n\u00e0y tr\u01b0\u1edbc khi vi\u1ebft b\u1ea5t k\u1ef3 d\u00f2ng SQL n\u00e0o.<\/p>\n

    2. M\u00f4 h\u00ecnh h\u00f3a logic: C\u00e1c quy t\u1eafc tham gia<\/h3>\n

    \u0110\u00e2y l\u00e0 n\u01a1i b\u1ea1n \u00e1p d\u1ee5ng c\u00e1c quy t\u1eafc chu\u1ea9n h\u00f3a. B\u1ea1n x\u00e1c \u0111\u1ecbnh r\u1eb1ng m\u1ed9t \u201cKh\u00e1ch h\u00e0ng\u201d kh\u00f4ng n\u00ean l\u01b0u \u0111\u1ecba ch\u1ec9 tr\u1ef1c ti\u1ebfp n\u1ebfu \u0111\u1ecba ch\u1ec9 \u0111\u00f3 c\u00f3 th\u1ec3 thay \u0111\u1ed5i th\u01b0\u1eddng xuy\u00ean v\u00e0 thu\u1ed9c v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3 kh\u00e1c. B\u1ea1n \u00e1p d\u1ee5ng chu\u1ea9n h\u00f3a \u0111\u1ec3 gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p. Tuy nhi\u00ean, b\u1ea1n c\u0169ng x\u00e1c \u0111\u1ecbnh d\u1eef li\u1ec7u n\u00e0o s\u1ebd c\u00f3 t\u1ea7n su\u1ea5t \u0111\u1ecdc cao v\u00e0 c\u00f3 th\u1ec3 c\u1ea7n chu\u1ea9n h\u00f3a l\u1ea1i sau n\u00e0y.<\/p>\n

    3. M\u00f4 h\u00ecnh h\u00f3a v\u1eadt l\u00fd: Th\u1ef1c t\u1ebf tri\u1ec3n khai<\/h3>\n

    \u0110\u00e2y l\u00e0 n\u01a1i gi\u1edbi h\u1ea1n c\u1ee7a b\u1ed9 \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u00e1t huy t\u00e1c d\u1ee5ng. B\u1ea1n c\u00f3 th\u1ec3 ph\u1ea3i l\u1ef1a ch\u1ecdn gi\u1eefa c\u1ed9t JSON v\u00e0 m\u1ed9t b\u1ea3ng quan h\u1ec7 ri\u00eang bi\u1ec7t \u0111\u1ec3 l\u01b0u tr\u1eef c\u00e1c thu\u1ed9c t\u00ednh linh ho\u1ea1t. B\u1ea1n quy\u1ebft \u0111\u1ecbnh chi\u1ebfn l\u01b0\u1ee3c l\u1eadp ch\u1ec9 m\u1ee5c d\u1ef1a tr\u00ean m\u1eabu truy v\u1ea5n. B\u1ea1n c\u00f3 th\u1ec3 quy\u1ebft \u0111\u1ecbnh s\u1eed d\u1ee5ng m\u1ed9t b\u1ed9 \u0111\u1ed9ng c\u01a1 l\u01b0u tr\u1eef c\u1ee5 th\u1ec3 h\u1ed7 tr\u1ee3 ghi nhanh h\u01a1n nh\u01b0ng \u0111\u1ecdc ch\u1eadm h\u01a1n.<\/p>\n

    Chi\u1ebfn l\u01b0\u1ee3c chu\u1ea9n h\u00f3a v\u00e0 c\u00e1c th\u1ecfa hi\u1ec7p hi\u1ec7u su\u1ea5t \u2696\ufe0f<\/h2>\n

    Chu\u1ea9n h\u00f3a l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m n\u1ec1n t\u1ea3ng trong thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u. N\u00f3 t\u1ed5 ch\u1ee9c d\u1eef li\u1ec7u nh\u1eb1m gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 c\u1ea3i thi\u1ec7n t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. Tuy nhi\u00ean, trong c\u00e1c h\u1ec7 th\u1ed1ng quy m\u00f4 l\u1edbn, vi\u1ec7c tu\u00e2n th\u1ee7 nghi\u00eam ng\u1eb7t c\u00e1c quy t\u1eafc chu\u1ea9n h\u00f3a c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh \u0111i\u1ec3m ngh\u1ebdn. C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao ph\u1ea3i hi\u1ec3u \u0111\u01b0\u1ee3c khi n\u00e0o n\u00ean ph\u00e1 v\u1ee1 c\u00e1c quy t\u1eafc.<\/p>\n

    Chi ph\u00ed c\u1ee7a chu\u1ea9n h\u00f3a<\/h3>\n

    Khi b\u1ea1n chu\u1ea9n h\u00f3a d\u1eef li\u1ec7u, b\u1ea1n th\u01b0\u1eddng t\u1ea1o th\u00eam nhi\u1ec1u b\u1ea3ng h\u01a1n. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 ph\u1ea3i th\u1ef1c hi\u1ec7n nhi\u1ec1u ph\u00e9p n\u1ed1i h\u01a1n khi truy v\u1ea5n. Trong h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n ho\u1eb7c \u1ee9ng d\u1ee5ng web c\u00f3 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp cao, m\u1ed7i ph\u00e9p n\u1ed1i \u0111\u1ec1u l\u00e0 m\u1ed9t \u0111i\u1ec3m ti\u1ec1m \u1ea9n g\u00e2y \u0111\u1ed9 tr\u1ec5. N\u1ebfu m\u1ed9t b\u1ea3ng \u0111\u01b0\u1ee3c ph\u00e2n v\u00f9ng, vi\u1ec7c n\u1ed1i gi\u1eefa c\u00e1c ph\u00e2n v\u00f9ng c\u00f3 th\u1ec3 t\u1ed1n k\u00e9m.<\/p>\n

    Khi n\u00e0o n\u00ean kh\u00f4ng chu\u1ea9n h\u00f3a<\/h3>\n

    Vi\u1ec7c kh\u00f4ng chu\u1ea9n h\u00f3a l\u00e0 vi\u1ec7c ch\u1ee7 \u00fd \u0111\u01b0a v\u00e0o s\u1ef1 tr\u00f9ng l\u1eb7p nh\u1eb1m t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t \u0111\u1ecdc. \u0110\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 sai l\u1ea7m; \u0111\u00f3 l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh chi\u1ebfn l\u01b0\u1ee3c. B\u1ea1n n\u00ean c\u00e2n nh\u1eafc vi\u1ec7c kh\u00f4ng chu\u1ea9n h\u00f3a khi:<\/p>\n

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    • C\u00e1c thao t\u00e1c \u0111\u1ecdc chi\u1ebfm \u01b0u th\u1ebf \u0111\u00e1ng k\u1ec3 so v\u1edbi c\u00e1c thao t\u00e1c ghi.<\/li>\n
    • C\u00e1c ph\u00e9p n\u1ed1i ph\u1ee9c t\u1ea1p \u0111ang g\u00e2y ra th\u1eddi gian ch\u1edd v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n ho\u1eb7c s\u1eed d\u1ee5ng CPU cao.<\/li>\n
    • B\u1ea1n \u0111ang x\u00e2y d\u1ef1ng m\u1ed9t l\u1edbp b\u00e1o c\u00e1o ho\u1eb7c ph\u00e2n t\u00edch trong \u0111\u00f3 t\u00ednh nh\u1ea5t qu\u00e1n th\u1eddi gian th\u1ef1c \u00edt quan tr\u1ecdng h\u01a1n.<\/li>\n
    • B\u1ea1n c\u1ea7n lo\u1ea1i b\u1ecf chu\u1ea9n h\u00f3a d\u1eef li\u1ec7u cho c\u00e1c l\u1edbp b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u1ec3 gi\u1ea3m t\u1ea3i c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n<\/ul>\n

      Ma tr\u1eadn Chu\u1ea9n h\u00f3a so v\u1edbi Hi\u1ec7u su\u1ea5t<\/h3>\n\n\n\n\n\n\n\n
      Chi\u1ebfn l\u01b0\u1ee3c<\/th>\nTo\u00e0n v\u1eb9n d\u1eef li\u1ec7u<\/th>\nHi\u1ec7u su\u1ea5t ghi<\/th>\nHi\u1ec7u su\u1ea5t \u0111\u1ecdc<\/th>\nKh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec<\/th>\n<\/tr>\n<\/thead>\n
      Chu\u1ea9n h\u00f3a cao (3NF)<\/strong><\/td>\nCao<\/td>\nNhanh (\u00edt d\u01b0 th\u1eeba)<\/td>\nCh\u1eadm h\u01a1n (y\u00eau c\u1ea7u c\u00e1c ph\u00e9p n\u1ed1i)<\/td>\nCao (d\u1ec5 c\u1eadp nh\u1eadt)<\/td>\n<\/tr>\n
      Kh\u00f4ng chu\u1ea9n h\u00f3a<\/strong><\/td>\nTh\u1ea5p h\u01a1n (c\u1ea7n \u0111\u1ed3ng b\u1ed9 th\u1ee7 c\u00f4ng)<\/td>\nCh\u1eadm h\u01a1n (d\u1eef li\u1ec7u ghi nhi\u1ec1u h\u01a1n)<\/td>\nNhanh h\u01a1n (\u00edt ph\u00e9p n\u1ed1i h\u01a1n)<\/td>\nTh\u1ea5p h\u01a1n (r\u1ee7i ro m\u1ea5t nh\u1ea5t qu\u00e1n)<\/td>\n<\/tr>\n
      Ph\u01b0\u01a1ng ph\u00e1p k\u1ebft h\u1ee3p<\/strong><\/td>\nTrung b\u00ecnh<\/td>\nTrung b\u00ecnh<\/td>\nTrung b\u00ecnh \u0111\u1ebfn nhanh<\/td>\nTrung b\u00ecnh (y\u00eau c\u1ea7u logic r\u00f5 r\u00e0ng)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Hi\u1ec3u \u0111\u01b0\u1ee3c ma tr\u1eadn n\u00e0y gi\u00fap b\u1ea1n \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh s\u00e1ng su\u1ed1t. B\u1ea1n kh\u00f4ng \u0111\u01a1n gi\u1ea3n ch\u1ec9 ‘chu\u1ea9n h\u00f3a m\u1ecdi th\u1ee9’ hay ‘kh\u00f4ng chu\u1ea9n h\u00f3a m\u1ecdi th\u1ee9’. B\u1ea1n c\u1ea7n ph\u00e2n t\u00edch c\u00e1c m\u1eabu truy c\u1eadp c\u1ee5 th\u1ec3 c\u1ee7a \u1ee9ng d\u1ee5ng c\u1ee7a m\u00ecnh.<\/p>\n

      M\u00f4 h\u00ecnh h\u00f3a c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p \ud83d\udd17<\/h2>\n

      C\u00e1c m\u1ed1i quan h\u1ec7 l\u00e0 c\u1ed1t l\u00f5i c\u1ee7a s\u01a1 \u0111\u1ed3 ER. Ch\u00fang x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 d\u1eef li\u1ec7u t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. Trong khi c\u00e1c m\u1ed1i quan h\u1ec7 M\u1ed9t-\u0111\u1ed1i-M\u1ed9t v\u00e0 M\u1ed9t-\u0111\u1ed1i-Nhi\u1ec1u kh\u00e1 tr\u1ef1c quan, c\u00e1c m\u1ed1i quan h\u1ec7 Nhi\u1ec1u-\u0111\u1ed1i-Nhi\u1ec1u th\u01b0\u1eddng \u0111\u00f2i h\u1ecfi c\u00e1ch x\u1eed l\u00fd c\u1ea9n tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng.<\/p>\n

      C\u00e1c m\u1ed1i quan h\u1ec7 M\u1ed9t-\u0111\u1ed1i-M\u1ed9t<\/h3>\n

      Nh\u1eefng m\u1ed1i quan h\u1ec7 n\u00e0y hi\u1ebfm khi x\u1ea3y ra trong th\u1ef1c t\u1ebf nh\u01b0ng v\u1eabn t\u1ed3n t\u1ea1i. V\u00ed d\u1ee5: m\u1ed9t b\u1ea3ng h\u1ed3 s\u01a1 ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u1ed9t b\u1ea3ng c\u00e0i \u0111\u1eb7t h\u1ed3 s\u01a1 ng\u01b0\u1eddi d\u00f9ng. B\u1ea1n c\u00f3 th\u1ec3 tri\u1ec3n khai b\u1eb1ng c\u00e1ch \u0111\u1eb7t kh\u00f3a ngo\u1ea1i trong m\u1ed9t b\u1ea3ng ho\u1eb7c chia d\u1eef li\u1ec7u th\u00e0nh hai b\u1ea3ng. Quy\u1ebft \u0111\u1ecbnh ph\u1ee5 thu\u1ed9c v\u00e0o m\u1eabu truy c\u1eadp. N\u1ebfu c\u00e0i \u0111\u1eb7t \u0111\u01b0\u1ee3c truy c\u1eadp th\u01b0\u1eddng xuy\u00ean c\u00f9ng v\u1edbi h\u1ed3 s\u01a1, h\u00e3y gi\u1eef ch\u00fang c\u00f9ng nhau. N\u1ebfu ch\u00fang hi\u1ebfm khi \u0111\u01b0\u1ee3c truy c\u1eadp, h\u00e3y t\u00e1ch ch\u00fang ra \u0111\u1ec3 gi\u1ea3m k\u00edch th\u01b0\u1edbc b\u1ea3ng ch\u00ednh.<\/p>\n

      M\u1ed1i quan h\u1ec7 m\u1ed9t-nhi\u1ec1u<\/h3>\n

      \u0110\u00e2y l\u00e0 m\u1eabu ph\u1ed5 bi\u1ebfn nh\u1ea5t. M\u1ed9t b\u00e0i vi\u1ebft blog c\u00f3 nhi\u1ec1u b\u00ecnh lu\u1eadn. Kh\u00f3a ngo\u1ea1i n\u1eb1m \u1edf ph\u00eda “nhi\u1ec1u” (b\u00ecnh lu\u1eadn). \u0110i\u1ec1u n\u00e0y hi\u1ec7u qu\u1ea3 cho c\u00e1c truy v\u1ea5n l\u1ea5y t\u1ea5t c\u1ea3 b\u00ecnh lu\u1eadn cho m\u1ed9t b\u00e0i vi\u1ebft c\u1ee5 th\u1ec3.<\/p>\n

      M\u1ed1i quan h\u1ec7 nhi\u1ec1u-nhi\u1ec1u<\/h3>\n

      M\u1ed9t ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 theo d\u00f5i nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng kh\u00e1c, v\u00e0 m\u1ed9t ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 b\u1ecb nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng kh\u00e1c theo d\u00f5i. \u0110i\u1ec1u n\u00e0y y\u00eau c\u1ea7u m\u1ed9t b\u1ea3ng li\u00ean k\u1ebft trung gian. B\u1ea3ng n\u00e0y th\u01b0\u1eddng ch\u1ee9a c\u00e1c kh\u00f3a ngo\u1ea1i c\u1ee7a c\u1ea3 hai ph\u00eda, c\u00f9ng v\u1edbi b\u1ea5t k\u1ef3 d\u1eef li\u1ec7u m\u00f4 t\u1ea3 n\u00e0o li\u00ean quan \u0111\u1ebfn m\u1ed1i quan h\u1ec7, ch\u1eb3ng h\u1ea1n nh\u01b0 th\u1eddi \u0111i\u1ec3m k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c t\u1ea1o.<\/p>\n

        \n
      • Kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ecf qua b\u1ea3ng li\u00ean k\u1ebft:<\/strong> N\u00f3 cho ph\u00e9p b\u1ea1n l\u1eadp ch\u1ec9 m\u1ee5c cho m\u1ed1i quan h\u1ec7 v\u00e0 truy v\u1ea5n m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/li>\n
      • Xem x\u00e9t c\u00e1c kh\u00f3a h\u1ee3p th\u00e0nh:<\/strong> Kh\u00f3a ch\u00ednh c\u1ee7a b\u1ea3ng li\u00ean k\u1ebft c\u00f3 th\u1ec3 l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a hai kh\u00f3a ngo\u1ea1i.<\/li>\n
      • Ch\u00fa \u00fd \u0111\u1ebfn t\u00ednh c\u1ea5p b\u1eadc:<\/strong> \u0110\u1ea3m b\u1ea3o b\u1ea1n x\u1eed l\u00fd c\u00e1c tr\u01b0\u1eddng h\u1ee3p m\u1ed1i quan h\u1ec7 l\u00e0 t\u00f9y ch\u1ecdn thay v\u00ec b\u1eaft bu\u1ed9c.<\/li>\n<\/ul>\n

        Ph\u00e1t tri\u1ec3n v\u00e0 di chuy\u1ec3n l\u01b0\u1ee3c \u0111\u1ed3 \ud83d\udd04<\/h2>\n

        M\u1ed9t trong nh\u1eefng ph\u1ea7n kh\u00f3 nh\u1ea5t khi l\u00e0m l\u1eadp tr\u00ecnh vi\u00ean c\u1ea5p cao l\u00e0 nh\u1eadn ra r\u1eb1ng s\u01a1 \u0111\u1ed3 ER kh\u00f4ng bao gi\u1edd ho\u00e0n thi\u1ec7n. Y\u00eau c\u1ea7u thay \u0111\u1ed5i, logic kinh doanh thay \u0111\u1ed5i, d\u1eef li\u1ec7u t\u0103ng l\u00ean. L\u01b0\u1ee3c \u0111\u1ed3 c\u1ee7a b\u1ea1n ph\u1ea3i ph\u00e1t tri\u1ec3n m\u00e0 kh\u00f4ng l\u00e0m h\u1ecfng ch\u1ee9c n\u0103ng hi\u1ec7n t\u1ea1i.<\/p>\n

        G\u00e1n phi\u00ean b\u1ea3n cho l\u01b0\u1ee3c \u0111\u1ed3<\/h3>\n

        Kh\u00f4ng bao gi\u1edd gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng vi\u1ec7c di chuy\u1ec3n l\u00e0 m\u1ed9t s\u1ef1 ki\u1ec7n duy nh\u1ea5t. Xem l\u01b0\u1ee3c \u0111\u1ed3 nh\u01b0 m\u00e3 ngu\u1ed3n. S\u1eed d\u1ee5ng ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n cho c\u00e1c k\u1ecbch b\u1ea3n di chuy\u1ec3n. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p b\u1ea1n ho\u00e0n nguy\u00ean thay \u0111\u1ed5i n\u1ebfu m\u1ed9t c\u1ed9t m\u1edbi g\u00e2y ra v\u1ea5n \u0111\u1ec1. N\u00f3 c\u0169ng cung c\u1ea5p b\u1ea3n ghi ki\u1ec3m to\u00e1n v\u1ec1 c\u00e1ch c\u1ea5u tr\u00fac d\u1eef li\u1ec7u thay \u0111\u1ed5i theo th\u1eddi gian.<\/p>\n

        Di chuy\u1ec3n kh\u00f4ng gi\u00e1n \u0111o\u1ea1n<\/h3>\n

        \u0110\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng s\u1ea3n xu\u1ea5t, th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng th\u01b0\u1eddng kh\u00f4ng th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi m\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn t\u1eebng b\u01b0\u1edbc cho c\u00e1c thay \u0111\u1ed5i l\u01b0\u1ee3c \u0111\u1ed3:<\/p>\n

          \n
        • Th\u00eam c\u1ed9t tr\u01b0\u1edbc ti\u00ean:<\/strong>Th\u00eam c\u1ed9t m\u1edbi v\u1edbi kh\u1ea3 n\u0103ng null. Tri\u1ec3n khai m\u00e3 ngu\u1ed3n vi\u1ebft v\u00e0o c\u1ed9t \u0111\u00f3.<\/li>\n
        • \u0110i\u1ec1n d\u1eef li\u1ec7u ng\u01b0\u1ee3c:<\/strong>Ch\u1ea1y m\u1ed9t t\u00e1c v\u1ee5 n\u1ec1n \u0111\u1ec3 \u0111i\u1ec1n d\u1eef li\u1ec7u v\u00e0o c\u1ed9t m\u1edbi.<\/li>\n
        • Chuy\u1ec3n \u0111\u1ed5i \u0111\u1ecdc:<\/strong>C\u1eadp nh\u1eadt \u1ee9ng d\u1ee5ng \u0111\u1ec3 \u0111\u1ecdc t\u1eeb c\u1ed9t m\u1edbi.<\/li>\n
        • X\u00f3a c\u00e1c c\u1ed9t c\u0169:<\/strong>Khi h\u1ec7 th\u1ed1ng \u1ed5n \u0111\u1ecbnh, x\u00f3a c\u1ed9t c\u0169.<\/li>\n<\/ul>\n

          X\u1eed l\u00fd kh\u00f3a<\/h3>\n

          Vi\u1ec7c th\u00eam ch\u1ec9 m\u1ee5c ho\u1eb7c r\u00e0ng bu\u1ed9c v\u00e0o m\u1ed9t b\u1ea3ng l\u1edbn c\u00f3 th\u1ec3 kh\u00f3a b\u1ea3ng, ng\u0103n ch\u1eb7n thao t\u00e1c ghi. B\u1ea1n ph\u1ea3i s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 thay \u0111\u1ed5i l\u01b0\u1ee3c \u0111\u1ed3 tr\u1ef1c tuy\u1ebfn ho\u1eb7c c\u00e1c chi\u1ebfn l\u01b0\u1ee3c ph\u00e2n v\u00f9ng \u0111\u1ec3 gi\u1ea3m thi\u1ec3u th\u1eddi gian kh\u00f3a. Hi\u1ec3u r\u00f5 c\u01a1 ch\u1ebf kh\u00f3a c\u1ee7a b\u1ed9 \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u n\u1ec1n t\u1ea3ng l\u00e0 \u0111i\u1ec1u then ch\u1ed1t \u1edf \u0111\u00e2y.<\/p>\n

          Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t \ud83d\udea7<\/h2>\n

          Ngay c\u1ea3 c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m khi chuy\u1ec3n \u0111\u1ed5i s\u01a1 \u0111\u1ed3 ER sang SQL. Bi\u1ebft \u0111\u01b0\u1ee3c nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn s\u1ebd gi\u00fap b\u1ea1n tr\u00e1nh ch\u00fang tr\u01b0\u1edbc khi ch\u00fang tr\u1edf th\u00e0nh v\u1ea5n \u0111\u1ec1 nghi\u00eam tr\u1ecdng.<\/p>\n

            \n
          • Gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c ghi c\u1ee9ng:<\/strong>Tr\u00e1nh s\u1eed d\u1ee5ng c\u00e1c c\u1ed9t `INT` \u0111\u1ec3 l\u01b0u tr\u1eef c\u1edd logic (0\/1) m\u00e0 kh\u00f4ng c\u00f3 r\u00e0ng bu\u1ed9c r\u00f5 r\u00e0ng. S\u1eed d\u1ee5ng ki\u1ec3u `BOOLEAN` ho\u1eb7c ki\u1ec3u li\u1ec7t k\u00ea n\u1ebfu \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3.<\/li>\n
          • Thi\u1ebfu r\u00e0ng bu\u1ed9c:<\/strong>D\u1ef1a ho\u00e0n to\u00e0n v\u00e0o logic \u1ee9ng d\u1ee5ng \u0111\u1ec3 th\u1ef1c thi kh\u00f3a ngo\u1ea1i l\u00e0 r\u1ee7i ro. N\u1ebfu m\u1ed9t l\u1ed7i cho ph\u00e9p ch\u00e8n d\u1eef li\u1ec7u x\u1ea5u, d\u1eef li\u1ec7u s\u1ebd b\u1ecb h\u1ecfng. Th\u1ef1c thi c\u00e1c r\u00e0ng bu\u1ed9c \u1edf c\u1ea5p \u0111\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n
          • S\u1eed d\u1ee5ng qu\u00e1 m\u1ee9c VARCHAR:<\/strong>M\u1eb7c d\u00f9 linh ho\u1ea1t, `VARCHAR` c\u00f3 th\u1ec3 ch\u1eadm h\u01a1n c\u00e1c ki\u1ec3u c\u00f3 \u0111\u1ed9 d\u00e0i c\u1ed1 \u0111\u1ecbnh nh\u01b0 `CHAR` \u0111\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 lo\u1ea1i d\u1eef li\u1ec7u. S\u1eed d\u1ee5ng `CHAR` cho d\u1eef li\u1ec7u c\u00f3 \u0111\u1ed9 d\u00e0i c\u1ed1 \u0111\u1ecbnh nh\u01b0 UUID ho\u1eb7c m\u00e3 b\u01b0u ch\u00ednh.<\/li>\n
          • B\u1ecf qua b\u1ed9 k\u00fd t\u1ef1:<\/strong>N\u1ebfu \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n h\u1ed7 tr\u1ee3 k\u00fd t\u1ef1 qu\u1ed1c t\u1ebf, h\u00e3y \u0111\u1ea3m b\u1ea3o c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 b\u1ea3ng \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh h\u1ed7 tr\u1ee3 UTF-8 ngay t\u1eeb \u0111\u1ea7u. Vi\u1ec7c thay \u0111\u1ed5i \u0111i\u1ec1u n\u00e0y sau n\u00e0y l\u00e0 r\u1ea5t kh\u00f3 kh\u0103n.<\/li>\n
          • C\u00e1c ph\u00e9p n\u1ed1i ng\u1ea7m:<\/strong>Tr\u00e1nh c\u00e1c truy v\u1ea5n n\u1ed1i b\u1ea3ng m\u00e0 kh\u00f4ng c\u00f3 ch\u1ec9 m\u1ee5c r\u00f5 r\u00e0ng. Lu\u00f4n xem x\u00e9t k\u1ebf ho\u1ea1ch th\u1ef1c thi truy v\u1ea5n.<\/li>\n<\/ul>\n

            Giao ti\u1ebfp gi\u1eefa c\u00e1c \u0111\u1ed9i ng\u0169 \ud83e\udd1d<\/h2>\n

            S\u01a1 \u0111\u1ed3 ER l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 giao ti\u1ebfp. N\u00f3 n\u1ed1i li\u1ec1n kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c qu\u1ea3n tr\u1ecb vi\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u, nh\u00e0 ph\u00e1t tri\u1ec3n backend, nh\u00e0 ph\u00e1t tri\u1ec3n frontend v\u00e0 c\u00e1c qu\u1ea3n l\u00fd s\u1ea3n ph\u1ea9m. M\u1ed9t s\u01a1 \u0111\u1ed3 r\u00f5 r\u00e0ng gi\u00fap ng\u0103n ng\u1eeba nh\u1eefng gi\u1ea3 \u0111\u1ecbnh sai l\u1ea7m.<\/p>\n

              \n
            • \u0110\u1ed1i v\u1edbi c\u00e1c qu\u1ea3n l\u00fd s\u1ea3n ph\u1ea9m:<\/strong>N\u00f3 gi\u00fap h\u1ecd hi\u1ec3u y\u00eau c\u1ea7u d\u1eef li\u1ec7u cho m\u1ed9t y\u00eau c\u1ea7u t\u00ednh n\u0103ng.<\/li>\n
            • \u0110\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n frontend:<\/strong>N\u00f3 l\u00e0m r\u00f5 c\u1ea5u tr\u00fac d\u1eef li\u1ec7u m\u00e0 h\u1ecd s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c t\u1eeb c\u00e1c API.<\/li>\n
            • \u0110\u1ed1i v\u1edbi DevOps:<\/strong>N\u00f3 cung c\u1ea5p th\u00f4ng tin cho l\u1eadp k\u1ebf ho\u1ea1ch dung l\u01b0\u1ee3ng v\u00e0 chi\u1ebfn l\u01b0\u1ee3c sao l\u01b0u.<\/li>\n<\/ul>\n

              N\u1ebfu s\u01a1 \u0111\u1ed3 kh\u00f4ng r\u00f5 r\u00e0ng, \u0111\u1ed9i ng\u0169 s\u1ebd \u0111o\u00e1n m\u00f2. Vi\u1ec7c \u0111o\u00e1n m\u00f2 d\u1eabn \u0111\u1ebfn l\u1ed7i. M\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao \u0111\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 ch\u00ednh x\u00e1c, c\u1eadp nh\u1eadt m\u1edbi nh\u1ea5t v\u00e0 d\u1ec5 truy c\u1eadp cho t\u1ea5t c\u1ea3 nh\u1eefng ng\u01b0\u1eddi tham gia v\u00e0o v\u00f2ng \u0111\u1eddi d\u1ef1 \u00e1n.<\/p>\n

              C\u00f4ng c\u1ee5 so v\u1edbi t\u01b0 duy \ud83d\udca1<\/h2>\n

              C\u00f3 r\u1ea5t nhi\u1ec1u c\u00f4ng c\u1ee5 s\u1eb5n s\u00e0ng \u0111\u1ec3 v\u1ebd s\u01a1 \u0111\u1ed3 ER. M\u1eb7c d\u00f9 ch\u00fang h\u1eefu \u00edch cho vi\u1ec7c tr\u1ef1c quan h\u00f3a, nh\u01b0ng ch\u00fang kh\u00f4ng th\u1ec3 thay th\u1ebf t\u01b0 duy ph\u1ea3n bi\u1ec7n. M\u1ed9t c\u00f4ng c\u1ee5 c\u00f3 th\u1ec3 t\u1ea1o SQL t\u1eeb s\u01a1 \u0111\u1ed3, nh\u01b0ng n\u00f3 kh\u00f4ng th\u1ec3 hi\u1ec3u logic kinh doanh \u0111\u1eb1ng sau l\u00fd do t\u1ea1i sao m\u1ed9t m\u1ed1i quan h\u1ec7 t\u1ed3n t\u1ea1i.<\/p>\n

                \n
              • T\u1eadp trung v\u00e0o logic:<\/strong>D\u00e0nh nhi\u1ec1u th\u1eddi gian h\u01a1n tr\u00ean b\u1ea3ng tr\u1eafng ho\u1eb7c trong tr\u00ecnh so\u1ea1n th\u1ea3o v\u0103n b\u1ea3n \u0111\u1ec3 th\u1ea3o lu\u1eadn v\u1ec1 m\u00f4 h\u00ecnh thay v\u00ec nh\u1ea5p v\u00e0o c\u00e1c n\u00fat trong c\u00f4ng c\u1ee5 v\u1ebd.<\/li>\n
              • X\u00e1c minh b\u1eb1ng SQL:<\/strong>Sau khi v\u1ebd s\u01a1 \u0111\u1ed3 xong, h\u00e3y vi\u1ebft SQL. N\u1ebfu SQL g\u00e2y nh\u1ea7m l\u1eabn, s\u01a1 \u0111\u1ed3 c\u00f3 kh\u1ea3 n\u0103ng \u0111ang c\u00f3 v\u1ea5n \u0111\u1ec1.<\/li>\n
              • Gi\u1eef \u0111\u01a1n gi\u1ea3n:<\/strong>\u0110\u1eebng thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 qu\u00e1 ph\u1ee9c t\u1ea1p. N\u1ebfu m\u1ed9t m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 suy ra \u0111\u01b0\u1ee3c, \u0111\u1eebng \u00e9p bu\u1ed9c m\u1ed9t c\u1ea5u tr\u00fac ph\u1ee9c t\u1ea1p.<\/li>\n<\/ul>\n

                Suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u \ud83c\udfc1<\/h2>\n

                X\u00e2y d\u1ef1ng m\u1ed9t l\u1edbp d\u1eef li\u1ec7u v\u1eefng ch\u1eafc l\u00e0 s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa l\u00fd thuy\u1ebft v\u00e0 th\u1ef1c ti\u1ec5n. M\u1ed9t s\u01a1 \u0111\u1ed3 ER kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t b\u1ee9c tranh; \u0111\u00f3 l\u00e0 m\u1ed9t h\u1ee3p \u0111\u1ed3ng gi\u1eefa \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n v\u00e0 d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n. Khi b\u1ea1n t\u00f4n tr\u1ecdng c\u00e1c l\u1edbp tr\u1eebu t\u01b0\u1ee3ng, hi\u1ec3u r\u00f5 c\u00e1c th\u1ecfa hi\u1ec7p gi\u1eefa chu\u1ea9n h\u00f3a v\u00e0 hi\u1ec7u su\u1ea5t, v\u00e0 l\u00ean k\u1ebf ho\u1ea1ch cho s\u1ef1 ph\u00e1t tri\u1ec3n ngay t\u1eeb ng\u00e0y \u0111\u1ea7u ti\u00ean, b\u1ea1n s\u1ebd t\u1ea1o ra c\u00e1c h\u1ec7 th\u1ed1ng b\u1ec1n b\u1ec9 v\u00e0 m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c.<\/p>\n

                Nh\u1eefng nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao hi\u1ec7u qu\u1ea3 nh\u1ea5t l\u00e0 nh\u1eefng ng\u01b0\u1eddi c\u00f3 th\u1ec3 nh\u00ecn v\u00e0o m\u1ed9t s\u01a1 \u0111\u1ed3 h\u00ecnh h\u1ed9p v\u00e0 \u0111\u01b0\u1eddng k\u1ebb v\u00e0 ngay l\u1eadp t\u1ee9c nh\u1eadn ra c\u00e1c truy v\u1ea5n ti\u1ec1m n\u0103ng, c\u00e1c \u0111i\u1ec3m ngh\u1ebdn c\u00f3 th\u1ec3 x\u1ea3y ra v\u00e0 con \u0111\u01b0\u1eddng di chuy\u1ec3n. H\u1ecd kh\u00f4ng ch\u1ec9 v\u1ebd \u0111\u01b0\u1eddng k\u1ebb; h\u1ecd thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng. B\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y, b\u1ea1n \u0111\u1ea3m b\u1ea3o ki\u1ebfn tr\u00fac d\u1eef li\u1ec7u c\u1ee7a m\u00ecnh h\u1ed7 tr\u1ee3 m\u1ee5c ti\u00eau kinh doanh m\u00e0 kh\u00f4ng tr\u1edf th\u00e0nh g\u00e1nh n\u1eb7ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

                S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) th\u01b0\u1eddng b\u1ecb m\u1ed9t s\u1ed1 ng\u01b0\u1eddi coi l\u00e0 nh\u1eefng b\u00e0i t\u1eadp h\u1ecdc thu\u1eadt ho\u1eb7c t\u00e0i li\u1ec7u \u0111\u01b0\u1ee3c t\u1ea1o ra ch\u1ec9 \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau…<\/p>\n","protected":false},"author":1,"featured_media":58,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"S\u01a1 \u0111\u1ed3 ER cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao: Tr\u1eebu t\u01b0\u1ee3ng so v\u1edbi Th\u1ef1c t\u1ebf \ud83d\udee0\ufe0f","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao c\u00e2n b\u1eb1ng gi\u1eefa tr\u1eebu t\u01b0\u1ee3ng s\u01a1 \u0111\u1ed3 ER v\u00e0 th\u1ef1c t\u1ebf tri\u1ec3n khai. H\u01b0\u1edbng d\u1eabn v\u1ec1 thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3, chu\u1ea9n h\u00f3a v\u00e0 chi\u1ebfn l\u01b0\u1ee3c di chuy\u1ec3n.","inline_featured_image":false,"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[6],"tags":[10,11],"class_list":["post-57","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-erd","tag-academic","tag-erd"],"yoast_head":"\nS\u01a1 \u0111\u1ed3 ER cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao: Tr\u1eebu t\u01b0\u1ee3ng so v\u1edbi Th\u1ef1c t\u1ebf \ud83d\udee0\ufe0f<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao c\u00e2n b\u1eb1ng gi\u1eefa tr\u1eebu t\u01b0\u1ee3ng s\u01a1 \u0111\u1ed3 ER v\u00e0 th\u1ef1c t\u1ebf tri\u1ec3n khai. H\u01b0\u1edbng d\u1eabn v\u1ec1 thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3, chu\u1ea9n h\u00f3a v\u00e0 chi\u1ebfn l\u01b0\u1ee3c di chuy\u1ec3n.\" \/>\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\/er-diagrams-senior-developers-abstraction-implementation\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"S\u01a1 \u0111\u1ed3 ER cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao: Tr\u1eebu t\u01b0\u1ee3ng so v\u1edbi Th\u1ef1c t\u1ebf \ud83d\udee0\ufe0f\" \/>\n<meta property=\"og:description\" content=\"H\u1ecdc c\u00e1ch c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea5p cao c\u00e2n b\u1eb1ng gi\u1eefa tr\u1eebu t\u01b0\u1ee3ng s\u01a1 \u0111\u1ed3 ER v\u00e0 th\u1ef1c t\u1ebf tri\u1ec3n khai. 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