{"id":1522,"date":"2026-03-23T04:14:10","date_gmt":"2026-03-23T04:14:10","guid":{"rendered":"https:\/\/www.ez-knowledge.com\/vi\/resolving-deadlock-risks-entity-relationship-models\/"},"modified":"2026-03-23T04:14:10","modified_gmt":"2026-03-23T04:14:10","slug":"resolving-deadlock-risks-entity-relationship-models","status":"publish","type":"post","link":"https:\/\/www.ez-knowledge.com\/vi\/resolving-deadlock-risks-entity-relationship-models\/","title":{"rendered":"Gi\u1ea3i quy\u1ebft R\u1ee7i ro B\u1ebf t\u1eafc th\u00f4ng qua M\u00f4 h\u00ecnh M\u1ed1i quan h\u1ec7 Th\u1ef1c th\u1ec3 T\u1ed1t h\u01a1n"},"content":{"rendered":"
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\"Child-style<\/figure>\n<\/div>\n

C\u00e1c t\u00ecnh tr\u1ea1ng b\u1ebf t\u1eafc c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u01b0\u1eddng b\u1ecb coi l\u00e0 nh\u1eefng b\u1ea5t th\u01b0\u1eddng t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y, nh\u1eefng l\u1ed7i b\u00ed \u1ea9n ch\u1ec9 xu\u1ea5t hi\u1ec7n khi t\u1ea3i n\u1eb7ng. Tuy nhi\u00ean, khi xem x\u00e9t k\u1ef9 h\u01a1n, nguy\u00ean nh\u00e2n g\u1ed1c r\u1ec5 th\u01b0\u1eddng n\u1eb1m \u1edf giai \u0111o\u1ea1n thi\u1ebft k\u1ebf logic. M\u00f4 h\u00ecnh M\u1ed1i quan h\u1ec7 Th\u1ef1c th\u1ec3 (ERD) quy \u0111\u1ecbnh c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac, li\u00ean k\u1ebft v\u00e0 truy c\u1eadp. Khi thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 kh\u00f4ng t\u00ednh \u0111\u1ebfn c\u00e1c m\u1eabu \u0111\u1ed3ng th\u1eddi, \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u b\u1ecb bu\u1ed9c ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi xung \u0111\u1ed9t. B\u00e0i vi\u1ebft n\u00e0y kh\u00e1m ph\u00e1 c\u00e1ch tinh ch\u1ec9nh c\u1ea5u tr\u00fac ERD c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 ng\u0103n ng\u1eeba r\u1ee7i ro b\u1ebf t\u1eafc, \u0111\u1ea3m b\u1ea3o lu\u1ed3ng giao d\u1ecbch tr\u01a1n tru v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh h\u1ec7 th\u1ed1ng cao h\u01a1n.<\/p>\n

\ud83d\udd0d M\u1ed1i li\u00ean h\u1ec7 gi\u1eefa Thi\u1ebft k\u1ebf L\u01b0\u1ee3c \u0111\u1ed3 v\u00e0 \u0110\u1ed3ng th\u1eddi<\/h2>\n

H\u1ea7u h\u1ebft c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n hi\u1ec3u r\u1eb1ng b\u1ebf t\u1eafc x\u1ea3y ra khi hai giao d\u1ecbch gi\u1eef c\u00e1c kh\u00f3a tr\u00ean c\u00e1c t\u00e0i nguy\u00ean m\u00e0 nhau c\u1ea7n, t\u1ea1o th\u00e0nh v\u00f2ng ch\u1edd v\u00f2ng. Tuy nhi\u00ean, quy\u1ebft \u0111\u1ecbnh kh\u00f3a m\u1ed9t h\u00e0ng, trang ho\u1eb7c b\u1ea3ng c\u1ee5 th\u1ec3 th\u01b0\u1eddng xu\u1ea5t ph\u00e1t t\u1eeb c\u00e1c m\u1ed1i quan h\u1ec7 b\u1ea3ng n\u1ec1n t\u1ea3ng. M\u1ed9t ERD \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng k\u00e9m c\u00f3 th\u1ec3 bu\u1ed9c \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u1ea3i n\u00e2ng c\u1ea5p kh\u00f3a m\u1ed9t c\u00e1ch kh\u00f4ng c\u1ea7n thi\u1ebft.<\/p>\n

Khi b\u1ea1n x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3, b\u1ea1n thi\u1ebft l\u1eadp c\u00e1c quy t\u1eafc v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. C\u00e1c kh\u00f3a ngo\u1ea1i, c\u1eadp nh\u1eadt lan truy\u1ec1n v\u00e0 r\u00e0ng bu\u1ed9c ki\u1ec3m tra \u0111\u1ec1u g\u00e2y ra chi ph\u00ed. N\u1ebfu m\u00f4 h\u00ecnh kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c m\u1eabu truy c\u1eadp c\u1ee7a \u1ee9ng d\u1ee5ng, \u0111\u1ed9ng c\u01a1 ph\u1ea3i th\u1ef1c hi\u1ec7n th\u00eam c\u00f4ng vi\u1ec7c \u0111\u1ec3 duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n. C\u00f4ng vi\u1ec7c b\u1ed5 sung n\u00e0y l\u00e0m k\u00e9o d\u00e0i th\u1eddi gian giao d\u1ecbch. Giao d\u1ecbch d\u00e0i h\u01a1n gi\u1eef kh\u00f3a trong th\u1eddi gian d\u00e0i h\u01a1n, l\u00e0m t\u0103ng x\u00e1c su\u1ea5t va ch\u1ea1m v\u1edbi c\u00e1c qu\u00e1 tr\u00ecnh \u0111\u1ed3ng th\u1eddi.<\/p>\n

C\u00e1c khu v\u1ef1c ch\u00ednh m\u00e0 ERD \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn h\u00e0nh vi kh\u00f3a bao g\u1ed3m:<\/p>\n

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  • R\u00e0ng bu\u1ed9c Kh\u00f3a ngo\u1ea1i:<\/strong> M\u1ed7i khi m\u1ed9t b\u1ea3n ghi con \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt ho\u1eb7c x\u00f3a, b\u1ea3n ghi cha th\u01b0\u1eddng c\u1ea7n \u0111\u01b0\u1ee3c kh\u00f3a \u0111\u1ec3 x\u00e1c th\u1ef1c t\u00ednh to\u00e0n v\u1eb9n tham chi\u1ebfu.<\/li>\n
  • V\u1ecb tr\u00ed Ch\u1ec9 m\u1ee5c:<\/strong> ERD cho bi\u1ebft c\u00e1c c\u1ed9t n\u00e0o th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p. Vi\u1ec7c thi\u1ebfu ch\u1ec9 m\u1ee5c tr\u00ean c\u00e1c c\u1ed9t quan h\u1ec7 bu\u1ed9c ph\u1ea3i qu\u00e9t to\u00e0n b\u1ea3ng, d\u1eabn \u0111\u1ebfn vi\u1ec7c n\u00e2ng c\u1ea5p kh\u00f3a l\u00ean m\u1ee9c cao h\u01a1n.<\/li>\n
  • M\u1ee9c \u0111\u1ed9 Chu\u1ea9n h\u00f3a:<\/strong> C\u00e1c l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a cao y\u00eau c\u1ea7u nhi\u1ec1u ph\u00e9p n\u1ed1i h\u01a1n. C\u00e1c ph\u00e9p n\u1ed1i ph\u1ee9c t\u1ea1p li\u00ean quan \u0111\u1ebfn nhi\u1ec1u b\u1ea3ng, l\u00e0m t\u0103ng di\u1ec7n t\u00edch ti\u1ec1m \u1ea9n xung \u0111\u1ed9t kh\u00f3a.<\/li>\n
  • Ph\u1ea1m vi Giao d\u1ecbch:<\/strong> M\u00f4 h\u00ecnh x\u00e1c \u0111\u1ecbnh c\u00e1c b\u1ea3ng n\u00e0o \u0111\u01b0\u1ee3c thao t\u00e1c c\u00f9ng nhau. Truy c\u1eadp c\u00e1c b\u1ea3ng kh\u00f4ng li\u00ean quan trong m\u1ed9t giao d\u1ecbch duy nh\u1ea5t c\u00f3 th\u1ec3 l\u00e0m ph\u00e2n m\u1ea3nh t\u00e0i nguy\u00ean v\u00e0 g\u00e2y ra xung \u0111\u1ed9t.<\/li>\n<\/ul>\n

    \ud83d\udd17 Kh\u00f3a ngo\u1ea1i v\u00e0 \u0110\u1ed9 chi ti\u1ebft Kh\u00f3a<\/h2>\n

    Kh\u00f3a ngo\u1ea1i l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a t\u00ednh to\u00e0n v\u1eb9n quan h\u1ec7, nh\u01b0ng c\u0169ng l\u00e0 ngu\u1ed3n ch\u00ednh g\u00e2y ra xung \u0111\u1ed9t. Khi m\u1ed9t giao d\u1ecbch thay \u0111\u1ed5i m\u1ed9t h\u00e0ng trong b\u1ea3ng con, c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u1ea3i \u0111\u1ea3m b\u1ea3o r\u1eb1ng h\u00e0ng tham chi\u1ebfu trong b\u1ea3ng cha t\u1ed3n t\u1ea1i. Vi\u1ec7c x\u00e1c th\u1ef1c n\u00e0y y\u00eau c\u1ea7u kh\u00f3a b\u1ea3n ghi cha. Trong m\u00f4i tr\u01b0\u1eddng \u0111\u1ed3ng th\u1eddi cao, n\u1ebfu nhi\u1ec1u giao d\u1ecbch c\u00f9ng c\u1ed1 g\u1eafng thay \u0111\u1ed5i c\u00e1c con kh\u00e1c nhau c\u1ee7a c\u00f9ng m\u1ed9t cha, ch\u00fang c\u00f3 th\u1ec3 ch\u1eb7n l\u1eabn nhau.<\/p>\n

    H\u00e3y xem x\u00e9t m\u1ed9t t\u00ecnh hu\u1ed1ng m\u00e0 b\u1ea3ng \u0111\u01a1n h\u00e0ng tham chi\u1ebfu \u0111\u1ebfn b\u1ea3ng kh\u00e1ch h\u00e0ng. N\u1ebfu b\u1ea3ng kh\u00e1ch h\u00e0ng \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt th\u01b0\u1eddng xuy\u00ean (v\u00ed d\u1ee5: thay \u0111\u1ed5i \u0111\u1ecba ch\u1ec9), v\u00e0 b\u1ea3ng \u0111\u01a1n h\u00e0ng c\u0169ng \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt th\u01b0\u1eddng xuy\u00ean (v\u00ed d\u1ee5: thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i), b\u1ea3n ghi kh\u00e1ch h\u00e0ng chung s\u1ebd tr\u1edf th\u00e0nh \u0111i\u1ec3m ngh\u1ebdn. ERD c\u1ea7n \u0111\u01b0\u1ee3c xem x\u00e9t l\u1ea1i \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh xem s\u1ef1 k\u1ebft h\u1ee3p n\u00e0y c\u00f3 th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft hay kh\u00f4ng.<\/p>\n

    C\u00e1c chi\u1ebfn l\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u r\u1ee7i ro n\u00e0y th\u00f4ng qua thi\u1ebft k\u1ebf bao g\u1ed3m:<\/p>\n

      \n
    • X\u00e1c th\u1ef1c B\u1ea5t \u0111\u1ed3ng b\u1ed9:<\/strong> N\u1ebfu t\u00ednh to\u00e0n v\u1eb9n tham chi\u1ebfu nghi\u00eam ng\u1eb7t kh\u00f4ng c\u1ea7n thi\u1ebft cho m\u1ed7i thao t\u00e1c vi m\u00f4, h\u00e3y c\u00e2n nh\u1eafc chuy\u1ec3n c\u00e1c ki\u1ec3m tra r\u00e0ng bu\u1ed9c sang c\u00e1c quy tr\u00ecnh n\u1ec1n. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m th\u1eddi gian kh\u00f3a \u0111\u01b0\u1ee3c gi\u1eef trong giao d\u1ecbch.<\/li>\n
    • T\u00e1ch bi\u1ec7t c\u00e1c B\u1ea3ng Ghi Nhi\u1ec1u:<\/strong> N\u1ebfu b\u1ea3ng cha n\u00f3ng v\u00e0 b\u1ea3ng con n\u00f3ng, h\u00e3y c\u00e2n nh\u1eafc sao ch\u00e9p kh\u00f3a cha v\u00e0o b\u1ea3ng con. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p b\u1ea3ng con \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i m\u00e0 kh\u00f4ng c\u1ea7n ch\u1ea1m \u0111\u1ebfn b\u1ea3ng cha, gi\u1ea3m thi\u1ec3u xung \u0111\u1ed9t kh\u00f3a tr\u00ean b\u1ea3ng cha.<\/li>\n
    • Tr\u01b0\u1eddng Kh\u00f3a T\u00edch c\u1ef1c:<\/strong> Thay v\u00ec ch\u1ec9 d\u1ef1a v\u00e0o kh\u00f3a kh\u00f3a ngo\u1ea1i \u1edf c\u1ea5p \u0111\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u, h\u00e3y gi\u1edbi thi\u1ec7u c\u00e1c c\u1ed9t phi\u00ean b\u1ea3n. \u0110i\u1ec1u n\u00e0y chuy\u1ec3n vi\u1ec7c ki\u1ec3m tra to\u00e0n v\u1eb9n sang logic \u1ee9ng d\u1ee5ng, th\u01b0\u1eddng l\u00e0m gi\u1ea3m th\u1eddi gian c\u01a1 s\u1edf d\u1eef li\u1ec7u gi\u1eef kh\u00f3a.<\/li>\n<\/ul>\n

      \ud83d\udcc9 M\u1ee9c \u0111\u1ed9 Chu\u1ea9n h\u00f3a v\u00e0 C\u00e2n b\u1eb1ng \u0110\u1ecdc\/Vi\u1ebft<\/h2>\n

      D\u1ea1ng chu\u1ea9n h\u00f3a th\u1ee9 ba (3NF) l\u00e0 ti\u00eau chu\u1ea9n v\u00e0ng v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u, t\u1ed1i thi\u1ec3u h\u00f3a s\u1ef1 tr\u00f9ng l\u1eb7p. Tuy nhi\u00ean, n\u00f3 kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng ph\u00f9 h\u1ee3p nh\u1ea5t v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng giao d\u1ecbch hi\u1ec7u su\u1ea5t cao. C\u00e1c l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a cao y\u00eau c\u1ea7u nhi\u1ec1u ph\u00e9p n\u1ed1i \u0111\u1ec3 truy xu\u1ea5t d\u1eef li\u1ec7u li\u00ean quan. Trong m\u1ed9t giao d\u1ecbch, n\u1ed1i nhi\u1ec1u b\u1ea3ng ngh\u0129a l\u00e0 ph\u1ea3i l\u1ea5y kh\u00f3a tr\u00ean nhi\u1ec1u b\u1ea3ng. N\u1ebfu th\u1ee9 t\u1ef1 truy c\u1eadp kh\u00f4ng nh\u1ea5t qu\u00e1n gi\u1eefa c\u00e1c giao d\u1ecbch, b\u1ebf t\u1eafc tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi.<\/p>\n

      Ng\u01b0\u1ee3c l\u1ea1i, m\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c phi chu\u1ea9n h\u00f3a cao gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng ph\u00e9p n\u1ed1i nh\u01b0ng l\u00e0m t\u0103ng k\u00edch th\u01b0\u1edbc h\u00e0ng. C\u00e1c h\u00e0ng l\u1edbn c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn ph\u00e2n trang v\u00e0 t\u0103ng I\/O, \u0111i\u1ec1u n\u00e0y c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t. M\u1ee5c ti\u00eau l\u00e0 t\u00ecm ra s\u1ef1 c\u00e2n b\u1eb1ng sao cho ERD h\u1ed7 tr\u1ee3 c\u00e1c m\u1eabu truy c\u1eadp ph\u1ed5 bi\u1ebfn nh\u1ea5t m\u00e0 kh\u00f4ng g\u00e2y ra s\u1ef1 ph\u1ee9c t\u1ea1p kh\u00f4ng c\u1ea7n thi\u1ebft.<\/p>\n

      Khi xem x\u00e9t l\u1ea1i ERD c\u1ee7a b\u1ea1n \u0111\u1ec3 t\u00ecm r\u1ee7i ro b\u1ebf t\u1eafc, h\u00e3y c\u00e2n nh\u1eafc c\u00e1c th\u1ecfa hi\u1ec7p sau:<\/p>\n

        \n
      • S\u1ef1 tr\u00f9ng l\u1eb7p vs. T\u00ednh nh\u1ea5t qu\u00e1n:<\/strong> B\u1ea1n c\u00f3 th\u1ec3 l\u01b0u tr\u1ea1ng th\u00e1i c\u1ee7a m\u1ed9t \u0111\u01a1n h\u00e0ng tr\u1ef1c ti\u1ebfp trong b\u1ea3ng \u0111\u01a1n h\u00e0ng thay v\u00ec n\u1ed1i v\u1edbi b\u1ea3ng tra c\u1ee9u tr\u1ea1ng th\u00e1i kh\u00f4ng? \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng ph\u00e9p n\u1ed1i v\u00e0 s\u1ed1 l\u01b0\u1ee3ng b\u1ea3ng b\u1ecb kh\u00f3a.<\/li>\n
      • \u0110\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a m\u1ed1i quan h\u1ec7:<\/strong>Tr\u00e1nh c\u00e1c chu\u1ed7i m\u1ed1i quan h\u1ec7 (A li\u00ean k\u1ebft v\u1edbi B, B li\u00ean k\u1ebft v\u1edbi C, C li\u00ean k\u1ebft v\u1edbi D) trong m\u1ed9t giao d\u1ecbch duy nh\u1ea5t. N\u1ebfu c\u00f3 th\u1ec3, h\u00e3y chia ch\u00fang th\u00e0nh c\u00e1c thao t\u00e1c logic ri\u00eang bi\u1ec7t.<\/li>\n
      • T\u1eadp trung \u0111\u1ecdc cao so v\u1edbi t\u1eadp trung ghi cao:<\/strong>N\u1ebfu m\u1ed9t ph\u1ea7n c\u1ee7a m\u00f4 h\u00ecnh c\u00f3 t\u1ea7n su\u1ea5t truy v\u1ea5n cao, vi\u1ec7c lo\u1ea1i b\u1ecf chu\u1ea9n h\u00f3a c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c. N\u1ebfu ph\u1ea7n \u0111\u00f3 c\u00f3 t\u1ea7n su\u1ea5t ghi cao, h\u00e3y gi\u1eef nguy\u00ean chu\u1ea9n h\u00f3a nh\u01b0ng \u0111\u1ea3m b\u1ea3o c\u00e1c ch\u1ec9 m\u1ee5c m\u1ea1nh m\u1ebd.<\/li>\n<\/ul>\n

        \ud83e\udde9 Tham chi\u1ebfu v\u00f2ng v\u00e0 chu\u1ed7i ph\u1ee5 thu\u1ed9c<\/h2>\n

        C\u00e1c tham chi\u1ebfu v\u00f2ng x\u1ea3y ra khi Entiti A ph\u1ee5 thu\u1ed9c v\u00e0o Entiti B, v\u00e0 Entiti B ph\u1ee5 thu\u1ed9c v\u00e0o Entiti A. M\u1eb7c d\u00f9 \u0111\u00f4i khi h\u1ee3p l\u1ec7 trong c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p c\u1ee5 th\u1ec3, ch\u00fang r\u1ea5t nguy hi\u1ec3m trong ng\u1eef c\u1ea3nh giao d\u1ecbch. N\u1ebfu m\u1ed9t giao d\u1ecbch c\u1ed1 g\u1eafng c\u1eadp nh\u1eadt c\u1ea3 hai entiti trong c\u00f9ng m\u1ed9t ph\u1ea1m vi, c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u1ea3i kh\u00f3a A r\u1ed3i \u0111\u1ebfn B. N\u1ebfu m\u1ed9t giao d\u1ecbch kh\u00e1c kh\u00f3a B r\u1ed3i \u0111\u1ebfn A, s\u1ebd x\u1ea3y ra k\u1eb9t ch\u1ebft ngay l\u1eadp t\u1ee9c.<\/p>\n

        ERD c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c ph\u1ee5 thu\u1ed9c v\u00f2ng. N\u1ebfu t\u1ed3n t\u1ea1i chu tr\u00ecnh, n\u00f3 ph\u1ea3i \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd c\u1ea9n th\u1eadn. Trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, ph\u1ee5 thu\u1ed9c n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf ho\u1eb7c l\u00e0m t\u00f9y ch\u1ecdn.<\/p>\n\n\n\n\n\n\n\n\n
        M\u1eabu ph\u1ee5 thu\u1ed9c<\/th>\nR\u1ee7i ro kh\u00f3a<\/th>\nGi\u1ea3m thi\u1ec3u r\u1ee7i ro trong thi\u1ebft k\u1ebf<\/th>\n<\/tr>\n<\/thead>\n
        Tham chi\u1ebfu t\u1ef1 th\u00e2n tr\u1ef1c ti\u1ebfp<\/td>\nCao<\/td>\nS\u1eed d\u1ee5ng m\u1ed9t b\u1ea3ng ph\u00e2n c\u1ea5p ri\u00eang bi\u1ec7t ho\u1eb7c b\u1ea3n \u0111\u1ed3 ID.<\/td>\n<\/tr>\n
        Kh\u00f3a ngo\u1ea1i t\u01b0\u01a1ng h\u1ed7<\/td>\nNghi\u00eam tr\u1ecdng<\/td>\nLo\u1ea1i b\u1ecf m\u1ed9t kh\u00f3a ngo\u1ea1i; \u0111\u1ea3m b\u1ea3o b\u1eb1ng logic \u1ee9ng d\u1ee5ng.<\/td>\n<\/tr>\n
        Chu\u1ed7i s\u00e2u (A\u2192B\u2192C\u2192A)<\/td>\nCao<\/td>\nNg\u1eaft chu\u1ed7i; chia nh\u1ecf c\u00e1c giao d\u1ecbch.<\/td>\n<\/tr>\n
        M\u1ed9t-nhi\u1ec1u v\u1edbi c\u1eadp nh\u1eadt lan truy\u1ec1n<\/td>\nTrung b\u00ecnh<\/td>\nV\u00f4 hi\u1ec7u h\u00f3a c\u1eadp nh\u1eadt lan truy\u1ec1n; x\u1eed l\u00fd trong \u1ee9ng d\u1ee5ng.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        Khi c\u00e1c tham chi\u1ebfu v\u00f2ng kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi, l\u1edbp \u1ee9ng d\u1ee5ng ph\u1ea3i \u0111\u1ea3m b\u1ea3o th\u1ee9 t\u1ef1 kh\u00f3a nghi\u00eam ng\u1eb7t. T\u1ea5t c\u1ea3 c\u00e1c giao d\u1ecbch ph\u1ea3i kh\u00f3a Entiti A tr\u01b0\u1edbc Entiti B. Tuy nhi\u00ean, ph\u1ee5 thu\u1ed9c v\u00e0o m\u00e3 \u1ee9ng d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh th\u1ee9 t\u1ef1 kh\u00f3a l\u00e0 kh\u00f4ng \u1ed5n \u0111\u1ecbnh. An to\u00e0n h\u01a1n l\u00e0 t\u00e1i c\u1ea5u tr\u00fac ERD \u0111\u1ec3 lo\u1ea1i b\u1ecf chu tr\u00ecnh n\u1ebfu c\u00f3 th\u1ec3.<\/p>\n

        \ud83d\uddfa\ufe0f Chi\u1ebfn l\u01b0\u1ee3c ch\u1ec9 m\u1ee5c b\u00ean trong ERD<\/h2>\n

        Ch\u1ec9 m\u1ee5c kh\u00f4ng ch\u1ec9 l\u00e0 c\u00f4ng c\u1ee5 hi\u1ec7u su\u1ea5t; ch\u00fang c\u0169ng l\u00e0 c\u00f4ng c\u1ee5 kh\u00f3a. ERD x\u00e1c \u0111\u1ecbnh c\u00e1c c\u1ed9t n\u00e0o l\u00e0 kh\u00f3a ngo\u1ea1i v\u00e0 kh\u00f3a ch\u00ednh. Nh\u1eefng c\u1ed9t n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u t\u00ecm ki\u1ebfm d\u1eef li\u1ec7u nhanh ch\u00f3ng. N\u1ebfu ERD x\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 nh\u01b0ng c\u1ed9t t\u01b0\u01a1ng \u1ee9ng kh\u00f4ng c\u00f3 ch\u1ec9 m\u1ee5c, \u0111\u1ed9ng c\u01a1 ph\u1ea3i qu\u00e9t to\u00e0n b\u1ed9 b\u1ea3ng. Vi\u1ec7c qu\u00e9t b\u1ea3ng s\u1ebd kh\u00f3a nhi\u1ec1u h\u00e0ng h\u01a1n so v\u1edbi thao t\u00e1c t\u00ecm ki\u1ebfm, l\u00e0m t\u0103ng kh\u1ea3 n\u0103ng ch\u1eb7n c\u00e1c giao d\u1ecbch kh\u00e1c.<\/p>\n

        M\u1ecdi c\u1ed9t kh\u00f3a ngo\u1ea1i \u0111\u1ec1u ph\u1ea3i \u0111\u01b0\u1ee3c ch\u1ec9 m\u1ee5c. \u0110\u00e2y l\u00e0 quy t\u1eafc c\u01a1 b\u1ea3n \u0111\u1ec3 ng\u0103n ch\u1eb7n k\u1eb9t ch\u1ebft. Kh\u00f4ng c\u00f3 ch\u1ec9 m\u1ee5c, c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 n\u00e2ng c\u1ea5p kh\u00f3a h\u00e0ng th\u00e0nh kh\u00f3a b\u1ea3ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n ki\u1ec3m tra t\u00ednh to\u00e0n v\u1eb9n. Kh\u00f3a b\u1ea3ng nghi\u00eam ng\u1eb7t h\u01a1n nhi\u1ec1u v\u00e0 l\u00e0m t\u0103ng c\u1ea1nh tranh m\u1ed9t c\u00e1ch b\u00f9ng n\u1ed5.<\/p>\n

        C\u00e2n nh\u1eafc c\u00e1c y\u1ebfu t\u1ed1 ch\u1ec9 m\u1ee5c trong giai \u0111o\u1ea1n m\u00f4 h\u00ecnh h\u00f3a:<\/p>\n

          \n
        • Ch\u1ec9 m\u1ee5c kh\u00f3a ngo\u1ea1i:<\/strong>\u0110\u1ea3m b\u1ea3o m\u1ecdi c\u1ed9t kh\u00f3a ngo\u1ea1i \u0111\u1ec1u c\u00f3 ch\u1ec9 m\u1ee5c t\u01b0\u01a1ng \u1ee9ng.<\/li>\n
        • Kh\u00f3a k\u1ebft h\u1ee3p:<\/strong> N\u1ebfu m\u1ed9t b\u1ea3ng s\u1eed d\u1ee5ng kh\u00f3a ch\u00ednh h\u1ee3p th\u00e0nh, h\u00e3y \u0111\u1ea3m b\u1ea3o c\u00e1c truy v\u1ea5n truy c\u1eadp c\u00e1c c\u1ed9t theo th\u1ee9 t\u1ef1 \u0111\u1ecbnh ngh\u0129a ch\u1ec9 m\u1ee5c. \u0110i\u1ec1u n\u00e0y ng\u0103n ch\u1eb7n vi\u1ec7c qu\u00e9t ch\u1ec9 m\u1ee5c.<\/li>\n
        • Ch\u1ec9 m\u1ee5c bao ph\u1ee7:<\/strong>\u0110\u1ed1i v\u1edbi c\u00e1c thao t\u00e1c \u0111\u1ecdc th\u01b0\u1eddng xuy\u00ean, h\u00e3y thi\u1ebft k\u1ebf c\u00e1c ch\u1ec9 m\u1ee5c bao g\u1ed3m d\u1eef li\u1ec7u c\u1ea7n thi\u1ebft. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u00e1p \u1ee9ng truy v\u1ea5n ch\u1ec9 t\u1eeb ch\u1ec9 m\u1ee5c, tr\u00e1nh ph\u1ea3i tra c\u1ee9u d\u1eef li\u1ec7u b\u1ea3ng.<\/li>\n
        • T\u1ea7n su\u1ea5t c\u1eadp nh\u1eadt:<\/strong>Tr\u00e1nh l\u1eadp ch\u1ec9 m\u1ee5c cho c\u00e1c c\u1ed9t th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt. M\u1ed7i l\u1ea7n c\u1eadp nh\u1eadt \u0111\u1ec1u y\u00eau c\u1ea7u ch\u1ec9 m\u1ee5c ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng l\u1ea1i, gi\u1eef kh\u00f3a trong su\u1ed1t qu\u00e1 tr\u00ecnh s\u1eeda \u0111\u1ed5i.<\/li>\n<\/ul>\n

          \ud83d\udd04 Ph\u1ea1m vi giao d\u1ecbch v\u00e0 th\u1ee9 t\u1ef1 truy c\u1eadp d\u1eef li\u1ec7u<\/h2>\n

          ERD x\u00e1c \u0111\u1ecbnh ranh gi\u1edbi c\u1ee7a d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n. N\u00f3 cho b\u1ea1n bi\u1ebft c\u00e1c b\u1ea3ng n\u00e0o thu\u1ed9c v\u1ec1 nhau. Tuy nhi\u00ean, n\u00f3 kh\u00f4ng quy \u0111\u1ecbnh th\u1ee9 t\u1ef1 truy c\u1eadp ch\u00fang. C\u00e1c t\u00ecnh tr\u1ea1ng ch\u1ebft ch\u1eb7n th\u01b0\u1eddng x\u1ea3y ra khi hai qu\u00e1 tr\u00ecnh kh\u00e1c nhau truy c\u1eadp c\u00f9ng m\u1ed9t t\u1eadp h\u1ee3p b\u1ea3ng theo th\u1ee9 t\u1ef1 kh\u00e1c nhau. B\u1ed9 \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00f4ng th\u1ec3 gi\u1ea3i quy\u1ebft xung \u0111\u1ed9t n\u00e0y m\u00e0 kh\u00f4ng ch\u1edd \u0111\u1ee3i, d\u1eabn \u0111\u1ebfn ch\u1ebft ch\u1eb7n.<\/p>\n

          B\u1eb1ng c\u00e1ch thi\u1ebft k\u1ebf ERD v\u1edbi c\u00e1c ranh gi\u1edbi giao d\u1ecbch trong t\u00e2m tr\u00ed, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecbnh h\u01b0\u1edbng logic \u1ee9ng d\u1ee5ng. N\u1ebfu m\u00f4 h\u00ecnh cho th\u1ea5y B\u1ea3ng A v\u00e0 B\u1ea3ng B c\u00f3 m\u1ed1i li\u00ean h\u1ec7 ch\u1eb7t ch\u1ebd, ch\u00fang n\u00ean \u0111\u01b0\u1ee3c truy c\u1eadp theo th\u1ee9 t\u1ef1 c\u1ed1 \u0111\u1ecbnh. N\u1ebfu B\u1ea3ng C c\u00f3 m\u1ed1i li\u00ean h\u1ec7 l\u1ecfng l\u1ebbo, n\u00f3 n\u00ean \u0111\u01b0\u1ee3c x\u1eed l\u00fd trong m\u1ed9t giao d\u1ecbch ri\u00eang bi\u1ec7t.<\/p>\n

          C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u0111\u1ec3 qu\u1ea3n l\u00fd th\u1ee9 t\u1ef1 truy c\u1eadp bao g\u1ed3m:<\/p>\n

            \n
          • Th\u1ee9 t\u1ef1 to\u00e0n c\u1ee5c:<\/strong>Thi\u1ebft l\u1eadp m\u1ed9t quy \u01b0\u1edbc n\u01a1i c\u00e1c b\u1ea3ng lu\u00f4n \u0111\u01b0\u1ee3c truy c\u1eadp theo m\u1ed9t tr\u00ecnh t\u1ef1 c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: theo ID ho\u1eb7c theo th\u1ee9 t\u1ef1 b\u1ea3ng ch\u1eef c\u00e1i).<\/li>\n
          • Giao d\u1ecbch ng\u1eafn:<\/strong>Gi\u1eef c\u00e1c giao d\u1ecbch ng\u1eafn nh\u1ea5t c\u00f3 th\u1ec3. Kh\u00f4ng bao g\u1ed3m logic kinh doanh t\u1ed1n th\u1eddi gian (nh\u01b0 g\u1ecdi API) b\u00ean trong m\u1ed9t giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n
          • Thao t\u00e1c nh\u00f3m:<\/strong>Thay v\u00ec c\u1eadp nh\u1eadt t\u1eebng h\u00e0ng m\u1ed9t, h\u00e3y nh\u00f3m ch\u00fang l\u1ea1i. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng s\u1ef1 ki\u1ec7n chi\u1ebfm gi\u1eef kh\u00f3a.<\/li>\n
          • C\u00f4 l\u1eadp nh\u1ea5t qu\u00e1n:<\/strong>S\u1eed d\u1ee5ng m\u1ee9c c\u00f4 l\u1eadp th\u1ea5p nh\u1ea5t \u0111\u00e1p \u1ee9ng nhu c\u1ea7u to\u00e0n v\u1eb9n d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n. C\u00e1c m\u1ee9c c\u00f4 l\u1eadp cao h\u01a1n gi\u1eef kh\u00f3a l\u00e2u h\u01a1n.<\/li>\n<\/ul>\n

            \ud83d\udee1\ufe0f X\u1eed l\u00fd x\u00f3a m\u1ec1m v\u00e0 b\u1ea3n ghi ho\u1ea1t \u0111\u1ed9ng<\/h2>\n

            Nhi\u1ec1u h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng x\u00f3a m\u1ec1m, \u0111\u00e1nh d\u1ea5u m\u1ed9t h\u00e0ng l\u00e0 \u0111\u00e3 x\u00f3a thay v\u00ec x\u00f3a ho\u00e0n to\u00e0n. L\u1ef1a ch\u1ecdn thi\u1ebft k\u1ebf n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn ERD. N\u1ebfu ERD bao g\u1ed3m m\u1ed9t c\u1edd x\u00f3a, c\u00e1c truy v\u1ea5n th\u01b0\u1eddng l\u1ecdc theo c\u1edd n\u00e0y. C\u1edd n\u00e0y tr\u1edf th\u00e0nh \u0111i\u1ec3m truy c\u1eadp ph\u1ed5 bi\u1ebfn cho nhi\u1ec1u giao d\u1ecbch.<\/p>\n

            N\u1ebfu m\u1ecdi giao d\u1ecbch \u0111\u1ec1u c\u1eadp nh\u1eadt c\u1edd `is_deleted` tr\u00ean c\u00f9ng m\u1ed9t t\u1eadp h\u1ee3p b\u1ea3n ghi, m\u1ee9c \u0111\u1ed9 c\u1ea1nh tranh s\u1ebd t\u0103ng v\u1ecdt. ERD n\u00ean xem x\u00e9t li\u1ec7u x\u00f3a m\u1ec1m c\u00f3 th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft cho t\u1ea5t c\u1ea3 c\u00e1c th\u1ef1c th\u1ec3 hay kh\u00f4ng. \u0110\u1ed1i v\u1edbi nh\u1eadt k\u00fd ho\u1eb7c h\u1ed3 s\u01a1 ki\u1ec3m to\u00e1n c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn, x\u00f3a c\u1ee9ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n. \u0110\u1ed1i v\u1edbi d\u1eef li\u1ec7u kh\u00e1ch h\u00e0ng, x\u00f3a m\u1ec1m ph\u1ed5 bi\u1ebfn nh\u01b0ng \u0111\u00f2i h\u1ecfi l\u1eadp ch\u1ec9 m\u1ee5c c\u1ea9n th\u1eadn.<\/p>\n

            Nh\u1eefng y\u1ebfu t\u1ed1 quan tr\u1ecdng khi m\u00f4 h\u00ecnh h\u00f3a x\u00f3a m\u1ec1m:<\/p>\n

              \n
            • C\u1edd tr\u1ea1ng th\u00e1i \u0111\u01b0\u1ee3c l\u1eadp ch\u1ec9 m\u1ee5c:<\/strong>\u0110\u1ea3m b\u1ea3o c\u1edd x\u00f3a m\u1ec1m n\u1eb1m trong ch\u1ec9 m\u1ee5c.<\/li>\n
            • T\u00e1ch bi\u1ec7t tr\u00e1ch nhi\u1ec7m:<\/strong>Gi\u1eef c\u00e1c b\u1ea3n ghi ho\u1ea1t \u0111\u1ed9ng v\u00e0 b\u1ea3n ghi \u0111\u00e3 x\u00f3a t\u00e1ch bi\u1ec7t v\u1ec1 m\u1eb7t logic m\u1ed7i khi c\u00f3 th\u1ec3, \u0111\u1ec3 tr\u00e1nh qu\u00e9t to\u00e0n b\u1ed9 b\u1ea3ng.<\/li>\n
            • D\u1ecdn d\u1eb9p n\u1ec1n:<\/strong>Kh\u00f4ng n\u00ean ph\u1ee5 thu\u1ed9c v\u00e0o giao d\u1ecbch ch\u00ednh \u0111\u1ec3 d\u1ecdn d\u1eb9p c\u00e1c b\u1ea3n ghi \u0111\u00e3 x\u00f3a. S\u1eed d\u1ee5ng m\u1ed9t quy tr\u00ecnh ri\u00eang \u0111\u1ec3 x\u1eed l\u00fd thu gom r\u00e1c.<\/li>\n<\/ul>\n

              \ud83d\udcca T\u00f3m t\u1eaft c\u00e1c \u0111i\u1ec1u ch\u1ec9nh thi\u1ebft k\u1ebf<\/h2>\n

              C\u1ea3i thi\u1ec7n M\u00f4 h\u00ecnh quan h\u1ec7 th\u1ef1c th\u1ec3 \u0111\u1ec3 ng\u0103n ch\u1eb7n ch\u1ebft ch\u1eb7n l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh c\u00f3 h\u1ec7 th\u1ed1ng. N\u00f3 \u0111\u00f2i h\u1ecfi ph\u1ea3i nh\u00ecn xa h\u01a1n nhu c\u1ea7u l\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u1ee9c th\u00ec v\u00e0 xem x\u00e9t h\u00e0nh vi th\u1eddi gian ch\u1ea1y c\u1ee7a h\u1ec7 th\u1ed1ng. B\u1eb1ng c\u00e1ch gi\u1ea3i quy\u1ebft c\u00e1c r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i, chu\u1ea9n h\u00f3a ph\u00f9 h\u1ee3p, qu\u1ea3n l\u00fd ch\u1ec9 m\u1ee5c v\u00e0 x\u00e1c \u0111\u1ecbnh r\u00f5 ranh gi\u1edbi giao d\u1ecbch, b\u1ea1n c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng m\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 ch\u1ed1ng l\u1ea1i s\u1ef1 c\u1ea1nh tranh.<\/p>\n

              D\u01b0\u1edbi \u0111\u00e2y l\u00e0 danh s\u00e1ch ki\u1ec3m tra c\u00f3 th\u1ec3 h\u01b0\u1edbng d\u1eabn cho vi\u1ec7c \u0111\u00e1nh gi\u00e1 c\u1ee7a b\u1ea1n:<\/p>\n

                \n
              • T\u1ea5t c\u1ea3 c\u00e1c kh\u00f3a ngo\u1ea1i c\u00f3 \u0111\u01b0\u1ee3c ch\u1ec9 m\u1ee5c h\u00f3a kh\u00f4ng?<\/li>\n
              • C\u00f3 t\u1ed3n t\u1ea1i c\u00e1c ph\u1ee5 thu\u1ed9c v\u00f2ng tr\u00f2n gi\u1eefa c\u00e1c b\u1ea3ng kh\u00f4ng?<\/li>\n
              • Th\u1ee9 t\u1ef1 truy c\u1eadp cho c\u00e1c b\u1ea3ng li\u00ean quan c\u00f3 nh\u1ea5t qu\u00e1n trong to\u00e0n b\u1ed9 \u1ee9ng d\u1ee5ng kh\u00f4ng?<\/li>\n
              • C\u00f3 th\u1ec3 chuy\u1ec3n c\u00e1c c\u1eadp nh\u1eadt lan truy\u1ec1n sang logic \u1ee9ng d\u1ee5ng kh\u00f4ng?<\/li>\n
              • C\u00f3 c\u00e1c c\u1eadp nh\u1eadt t\u1ea7n su\u1ea5t cao tr\u00ean c\u00e1c b\u1ea3n ghi cha chung kh\u00f4ng?<\/li>\n
              • M\u1ee9c \u0111\u1ed9 chu\u1ea9n h\u00f3a c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi t\u1ef7 l\u1ec7 \u0111\u1ecdc\/ghi kh\u00f4ng?<\/li>\n<\/ul>\n

                Vi\u1ec7c \u00e1p d\u1ee5ng c\u00e1c th\u1ef1c h\u00e0nh n\u00e0y kh\u00f4ng \u0111\u1ea3m b\u1ea3o lo\u1ea1i b\u1ecf m\u1ecdi v\u1ea5n \u0111\u1ec1 \u0111\u1ed3ng th\u1eddi, v\u00ec ph\u1ea7n c\u1ee9ng v\u00e0 t\u1ea3i thay \u0111\u1ed5i. Tuy nhi\u00ean, n\u00f3 lo\u1ea1i b\u1ecf c\u00e1c nguy\u00ean nh\u00e2n c\u1ea5u tr\u00fac d\u1eabn \u0111\u1ebfn k\u1eb9t ch\u1ebft. M\u1ed9t m\u00f4 h\u00ecnh \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf t\u1ed1t s\u1ebd \u0111\u00f3ng vai tr\u00f2 n\u1ec1n t\u1ea3ng cho m\u1ed9t h\u1ec7 th\u1ed1ng \u1ed5n \u0111\u1ecbnh, gi\u1ea3m nhu c\u1ea7u v\u1ec1 c\u00e1c b\u1ea3n v\u00e1 kh\u1ea9n c\u1ea5p v\u00e0 logic kh\u00f3a ph\u1ee9c t\u1ea1p trong giai \u0111o\u1ea1n sau c\u1ee7a v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n.<\/p>\n","protected":false},"excerpt":{"rendered":"

                C\u00e1c t\u00ecnh tr\u1ea1ng b\u1ebf t\u1eafc c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u01b0\u1eddng b\u1ecb coi l\u00e0 nh\u1eefng b\u1ea5t th\u01b0\u1eddng t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y, nh\u1eefng l\u1ed7i b\u00ed \u1ea9n ch\u1ec9 xu\u1ea5t hi\u1ec7n khi t\u1ea3i n\u1eb7ng.…<\/p>\n","protected":false},"author":1,"featured_media":1523,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Gi\u1ea3i quy\u1ebft R\u1ee7i ro K\u1eb9t Ch\u1ebft th\u00f4ng qua C\u00e1c M\u00f4 H\u00ecnh ER T\u1ed1t H\u01a1n \ud83d\uddc4\ufe0f","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch c\u00e1c m\u00f4 h\u00ecnh quan h\u1ec7 th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a ng\u0103n ch\u1eb7n k\u1eb9t ch\u1ebft c\u01a1 s\u1edf d\u1eef li\u1ec7u. C\u1ea3i thi\u1ec7n thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u00ednh \u0111\u1ed3ng th\u1eddi v\u00e0 to\u00e0n v\u1eb9n giao d\u1ecbch t\u1ed1t h\u01a1n.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[65],"tags":[80,84],"class_list":["post-1522","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-design","tag-academic","tag-erd"],"yoast_head":"\nGi\u1ea3i quy\u1ebft R\u1ee7i ro K\u1eb9t Ch\u1ebft th\u00f4ng qua C\u00e1c M\u00f4 H\u00ecnh ER T\u1ed1t H\u01a1n \ud83d\uddc4\ufe0f<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch c\u00e1c m\u00f4 h\u00ecnh quan h\u1ec7 th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a ng\u0103n ch\u1eb7n k\u1eb9t ch\u1ebft c\u01a1 s\u1edf d\u1eef li\u1ec7u. 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