{"id":5066,"date":"2023-11-07T07:04:56","date_gmt":"2023-11-07T00:04:56","guid":{"rendered":"https:\/\/mhgvietnam.com\/?p=5066"},"modified":"2023-11-07T07:05:03","modified_gmt":"2023-11-07T00:05:03","slug":"sql-la-gi-tai-sao-ban-nen-hoc-ngon-ngu-sql-ngay-bay-gio","status":"publish","type":"post","link":"https:\/\/mhgvietnam.com\/en\/sql-la-gi-tai-sao-ban-nen-hoc-ngon-ngu-sql-ngay-bay-gio\/","title":{"rendered":"SQL L\u00e0 G\u00ec? T\u1ea1i Sao B\u1ea1n N\u00ean H\u1ecdc Ng\u00f4n Ng\u1eef SQL Ngay B\u00e2y Gi\u1edd?"},"content":{"rendered":"<\/p>\n
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Ng\u00e0y nay, ng\u00e0nh ph\u00e2n t\u00edch d\u1eef li\u1ec7u ng\u00e0y c\u00e0ng tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn v\u00e0 ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai. N\u1ebfu b\u1ea1n \u0111ang mu\u1ed1n t\u00ecm hi\u1ec3u v\u1ec1 ng\u00e0nh ph\u00e2n t\u00edch d\u1eef li\u1ec7u, ch\u1eafc ch\u1eafn b\u1ea1n s\u1ebd ph\u1ea3i bi\u1ebft \u0111\u1ebfn ng\u00f4n ng\u1eef SQL. Ng\u00f4n ng\u1eef SQL th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft trong qu\u00e1 tr\u00ecnh x\u00e2y d\u1ef1ng, qu\u1ea3n tr\u1ecb d\u1eef li\u1ec7u, g\u00f3p ph\u1ea7n cho c\u00f4ng vi\u1ec7c ph\u00e2n t\u00edch, cung c\u1ea5p th\u00f4ng tin \u0111\u01b0\u1ee3c d\u1ec5 d\u00e0ng h\u01a1n.\u00a0<\/p>\n

<\/span>SQL l\u00e0 g\u00ec?<\/strong><\/span><\/h2>\n

V\u1eady SQL l\u00e0 g\u00ec? SQL vi\u1ebft t\u1eaft c\u1ee7a t\u1eeb g\u00ec? \u00a0<\/p>\n

T\u1eeb \u201cStructured Query Language\u201d \u0111\u01b0\u1ee3c vi\u1ebft t\u1eaft l\u00e0 SQL \u2013 c\u00f3 ngh\u0129a l\u00e0 ng\u00f4n ng\u1eef truy v\u1ea5n c\u1ea5u tr\u00fac d\u1eef li\u1ec7u.\u00a0<\/p>\n

\u0110\u1ec3 giao ti\u1ebfp v\u1edbi c\u01a1 s\u1edf d\u1eef li\u1ec7u (database), SQL l\u00e0 c\u1ea7n thi\u1ebft. N\u00f3 l\u00e0 ng\u00f4n ng\u1eef \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn cho c\u00e1c h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7, theo tuy\u00ean b\u1ed1 c\u1ee7a ANSI (Vi\u1ec7n Ti\u00eau chu\u1ea9n Qu\u1ed1c gia Hoa K\u1ef3). C\u1eadp nh\u1eadt d\u1eef li\u1ec7u tr\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 truy xu\u1ea5t d\u1eef li\u1ec7u t\u1eeb c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 hai v\u00ed d\u1ee5 v\u1ec1 c\u00e1c t\u00e1c v\u1ee5 s\u1eed d\u1ee5ng c\u00e2u l\u1ec7nh SQL. Oracle, Sybase, Microsoft SQL Server, Access, Ingres v\u00e0 c\u00e1c h\u1ec7 qu\u1ea3n tr\u1ecb c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7 n\u1ed5i ti\u1ebfng kh\u00e1c l\u00e0 m\u1ed9t v\u00e0i v\u00ed d\u1ee5.<\/p>\n

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

M\u1eb7c d\u00f9 s\u1eed d\u1ee5ng SQL th\u01b0\u1eddng xuy\u00ean, h\u1ea7u h\u1ebft c\u00e1c h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u0169ng ch\u1ee9a c\u00e1c ph\u1ea7n m\u1edf r\u1ed9ng \u0111\u1ed9c quy\u1ec1n th\u01b0\u1eddng ch\u1ec9 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi h\u1ec7 th\u1ed1ng \u0111\u00f3. Tuy nhi\u00ean, c\u00e1c l\u1ec7nh SQL \u0111i\u1ec3n h\u00ecnh, ch\u1eb3ng h\u1ea1n nh\u01b0 \u201cCh\u1ecdn\u201d, \u201cCh\u00e8n\u201d, \u201cC\u1eadp nh\u1eadt\u201d, \u201cX\u00f3a\u201d, \u201cT\u1ea1o\u201d v\u00e0 \u201cTh\u1ea3\u201d, c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ho\u00e0n th\u00e0nh h\u1ea7u h\u1ebft c\u00e1c t\u00e1c v\u1ee5 li\u00ean quan \u0111\u1ebfn c\u01a1 s\u1edf d\u1eef li\u1ec7u.\u00a0<\/p>\n

C\u00e1c c\u00f4ng ty l\u1edbn hi\u1ec7n nay \u0111\u1ec1u \u0111\u00e3 v\u00e0 \u0111ang c\u00f3 c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u1ec3 l\u01b0u tr\u1eef c\u01a1 s\u1edf d\u1eef li\u1ec7u. C\u00e1c d\u1eef li\u1ec7u trong c\u01a1 s\u1edf d\u1eef li\u1ec7u n\u00e0y \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp th\u00e0nh nhi\u1ec1u b\u1ea3ng v\u00e0 ch\u00fang c\u00f3 s\u1ef1 li\u00ean k\u1ebft l\u1eabn nhau. \u0110\u1ec3 l\u1ea5y hay truy v\u1ea5n d\u1eef li\u1ec7u n\u00e0o \u0111\u00f3 \u0111\u1ec3 t\u1ed5ng h\u1ee3p th\u00e0nh th\u00f4ng tin, h\u1ecd s\u1ebd d\u00f9ng \u0111\u1ebfn SQL th\u00f4ng qua c\u00e1c c\u00e2u l\u1ec7nh.\u00a0<\/p>\n

\u0110\u1ecdc th\u00eam:<\/strong> SQL Developer L\u00e0 G\u00ec? L\u00e0m Th\u1ebf N\u00e0o \u0110\u1ec3 Tr\u1edf Th\u00e0nh SQL Developer?<\/p>\n

<\/span>L\u1ecbch s\u1eed c\u1ee7a ng\u00f4n ng\u1eef SQL l\u00e0 g\u00ec?\u00a0<\/strong><\/span><\/h2>\n

\u0110\u1ec3 hi\u1ec3u h\u01a1n v\u1ec1 ng\u00f4n ng\u1eef truy v\u1ea5n c\u1ea5u tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u, ta n\u00ean bi\u1ebft v\u1ec1 l\u1ecbch s\u1eed h\u00ecnh th\u00e0nh c\u1ee7a n\u00f3. D\u01b0\u1edbi \u0111\u00e2y, Ch\u00fang t\u00f4i cung c\u1ea5p cho b\u1ea1n t\u1ed5ng quan v\u1ec1 l\u1ecbch s\u1eed h\u00ecnh th\u00e0nh ng\u00f4n ng\u1eef SQL:\u00a0<\/p>\n

    \n
  • 1970 \u2013 Ti\u1ebfn s\u0129 Edgar F. \u201cTed\u201d Codd c\u1ee7a IBM l\u00e0 ng\u01b0\u1eddi \u0111\u1ea7u ti\u00ean ngh\u0129 ra\u00a0 c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7 (Relational Database).\u00a0<\/li>\n
  • 1974 \u2013 Ng\u00f4n ng\u1eef truy v\u1ea5n c\u1ea5u tr\u00fac d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c t\u1ea1o ra.<\/li>\n
  • 1978 \u2013 IBM ph\u00e1t tri\u1ec3n c\u00e1c m\u00f4 t\u1ea3, \u00fd t\u01b0\u1edfng c\u1ee7a Ti\u1ebfn s\u0129 Edgar F. \u201cTed\u201d Codd v\u00e0 cho ra \u0111\u1eddi m\u1ed9t s\u1ea3n ph\u1ea9m l\u00e0 System \/ R.<\/li>\n
  • 1986 \u2013 Nguy\u00ean m\u1eabu c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7 \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c IBM t\u1ea1o ra v\u00e0o n\u0103m 1986 v\u00e0 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a b\u1edfi ANSI. Ph\u1ea7n m\u1ec1m quan h\u1ec7, sau \u0111\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Oracle, ch\u00ednh c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7 \u0111\u1ea7u ti\u00ean \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t h\u00e0nh.<\/li>\n<\/ul>\n

    <\/span>Ng\u00f4n ng\u1eef SQL c\u00f3 th\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c nh\u1eefng g\u00ec?\u00a0<\/strong><\/span><\/h2>\n

    V\u1eady t\u00e1c d\u1ee5ng c\u1ee7a ng\u00f4n ng\u1eef SQL l\u00e0 g\u00ec? Ch\u00fang t\u00f4i s\u1ebd \u201c\u0111i\u1ec3m danh\u201d nh\u1eefng vi\u1ec7c m\u00e0 ng\u00f4n ng\u1eef SQL c\u00f3 th\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c ngay d\u01b0\u1edbi \u0111\u00e2y:\u00a0<\/p>\n

      \n
    • SQL c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ec3 ch\u1ea1y c\u00e1c truy v\u1ea5n.<\/li>\n
    • SQL c\u00f3 quy\u1ec1n truy c\u1eadp v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u cho d\u1eef li\u1ec7u.<\/li>\n
    • B\u1ea3n ghi c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng SQL.<\/li>\n
    • C\u00e1c b\u1ea3n ghi c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt b\u1eb1ng SQL.<\/li>\n
    • X\u00f3a b\u1ea3n ghi kh\u1ecfi c\u01a1 s\u1edf d\u1eef li\u1ec7u b\u1eb1ng SQL.<\/li>\n
    • T\u1ea1o c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1edbi b\u1eb1ng SQL.<\/li>\n
    • Trong c\u01a1 s\u1edf d\u1eef li\u1ec7u, SQL c\u00f3 th\u1ec3 t\u1ea1o b\u1ea3ng m\u1edbi.<\/li>\n
    • Trong c\u01a1 s\u1edf d\u1eef li\u1ec7u, SQL c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c th\u1ee7 t\u1ee5c \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef.<\/li>\n
    • C\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 c\u00f3 c\u00e1c d\u1ea1ng xem \u0111\u01b0\u1ee3c t\u1ea1o th\u00f4ng qua SQL.<\/li>\n
    • T\u1ea5t c\u1ea3 c\u00e1c b\u1ea3ng, th\u1ee7 t\u1ee5c v\u00e0 d\u1ea1ng xem \u0111\u1ec1u c\u00f3 th\u1ec3 c\u00f3 c\u00e1c quy\u1ec1n \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh th\u00f4ng qua SQL.<\/li>\n<\/ul>\n

      <\/span>C\u00e1c c\u00e2u l\u1ec7nh c\u1ee7a SQL l\u00e0 g\u00ec?<\/strong><\/span><\/h2>\n

      CREATE, SELECT, INSERT, UPDATE, DELETE v\u00e0 DROP l\u00e0 c\u00e1c l\u1ec7nh SQL ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 giao ti\u1ebfp v\u1edbi c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7. D\u1ef1a tr\u00ean b\u1ea3n ch\u1ea5t c\u1ee7a c\u00e1c l\u1ec7nh n\u00e0y, c\u00f3 th\u1ec3 t\u1ea1o c\u00e1c danh m\u1ee5c sau:<\/p>\n

      DDL \u2013 Data Definition Language \u2013 Ng\u00f4n ng\u1eef \u0111\u1ecbnh ngh\u0129a d\u1eef li\u1ec7u:\u00a0<\/p>\n

      \n\n\n\n\n\n\n
      STT<\/td>\nL\u1ec7nh<\/td>\nM\u00f4 t\u1ea3<\/td>\n<\/tr>\n
      1<\/td>\nCREATE<\/td>\nT\u1ea1o b\u1ea3ng m\u1edbi, d\u1ea1ng xem b\u1ea3ng ho\u1eb7c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c trong c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/td>\n<\/tr>\n
      2<\/td>\nALTER<\/td>\nS\u1eeda \u0111\u1ed5i \u0111\u1ed1i t\u01b0\u1ee3ng c\u01a1 s\u1edf d\u1eef li\u1ec7u hi\u1ec7n c\u00f3, ch\u1eb3ng h\u1ea1n nh\u01b0 b\u1ea3ng.<\/td>\n<\/tr>\n
      3<\/td>\nDROP<\/td>\nX\u00f3a to\u00e0n b\u1ed9 b\u1ea3ng, d\u1ea1ng xem b\u1ea3ng ho\u1eb7c c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c trong c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n

      DML \u2013 Data Manipulation Language \u2013 Ng\u00f4n ng\u1eef thao t\u00e1c d\u1eef li\u1ec7u:<\/p>\n

      \n\n\n\n\n\n\n\n
      STT<\/td>\nL\u1ec7nh\u00a0<\/td>\nM\u00f4 t\u1ea3<\/td>\n<\/tr>\n
      1<\/td>\nSELECT<\/td>\nTruy xu\u1ea5t c\u00e1c b\u1ea3n ghi nh\u1ea5t \u0111\u1ecbnh t\u1eeb m\u1ed9t ho\u1eb7c nhi\u1ec1u b\u1ea3ng.<\/td>\n<\/tr>\n
      2<\/td>\nINSERT<\/td>\nT\u1ea1o m\u1ed9t b\u1ea3n ghi\/h\u1ed3 s\u01a1 d\u1eef li\u1ec7u<\/td>\n<\/tr>\n
      3<\/td>\nUPDATE<\/td>\nS\u1eeda \u0111\u1ed5i b\u1ea3n ghi\/d\u1eef li\u1ec7u<\/td>\n<\/tr>\n
      4<\/td>\nDELETE<\/td>\nX\u00f3a b\u1ea3n ghi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n

      DCL \u2013 Data Control Language \u2013 Ng\u00f4n ng\u1eef \u0111i\u1ec1u khi\u1ec3n d\u1eef li\u1ec7u<\/p>\n

      \n\n\n\n\n\n
      STT<\/td>\nL\u1ec7nh<\/td>\nM\u00f4 t\u1ea3<\/td>\n<\/tr>\n
      1<\/td>\nGRANT<\/td>\nCung c\u1ea5p m\u1ed9t \u0111\u1eb7c quy\u1ec1n cho ng\u01b0\u1eddi d\u00f9ng.<\/td>\n<\/tr>\n
      2<\/td>\nREVOKE<\/td>\nL\u1ea5y l\u1ea1i c\u00e1c \u0111\u1eb7c quy\u1ec1n \u0111\u00e3 c\u1ea5p t\u1eeb ng\u01b0\u1eddi d\u00f9ng.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n

      <\/span>SQL ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/span><\/h2>\n<\/p>\n
      \n
      \"sql\"sql<\/figure>\n<\/div>\n

      M\u1ed9t \u201cb\u1ed9 x\u1eed l\u00fd ng\u00f4n ng\u1eef truy v\u1ea5n\u201d v\u1edbi tr\u00ecnh ph\u00e2n t\u00edch c\u00fa ph\u00e1p v\u00e0 tr\u00ecnh t\u1ed1i \u01b0u h\u00f3a truy v\u1ea5n s\u1ebd x\u1eed l\u00fd m\u1ed9t truy v\u1ea5n SQL khi n\u00f3 \u0111\u01b0\u1ee3c vi\u1ebft v\u00e0 th\u1ef1c thi. Sau \u0111\u00f3, truy v\u1ea5n \u0111\u00e3 x\u1eed l\u00fd \u0111\u01b0\u1ee3c m\u00e1y ch\u1ee7 SQL t\u1eadp h\u1ee3p theo ba b\u01b0\u1edbc:<\/p>\n

        \n
      • B\u01b0\u1edbc 1. Ph\u00e2n t\u00edch c\u00fa ph\u00e1p: B\u01b0\u1edbc n\u00e0y m\u00f4 t\u1ea3 m\u1ed9t th\u1ee7 t\u1ee5c ki\u1ec3m tra k\u1ef9 c\u00fa ph\u00e1p c\u1ee7a truy v\u1ea5n.<\/li>\n
      • B\u01b0\u1edbc 2. R\u00e0ng bu\u1ed9c: Tr\u01b0\u1edbc khi th\u1ef1c hi\u1ec7n truy v\u1ea5n, b\u01b0\u1edbc n\u00e0y \u0111\u00f2i h\u1ecfi ph\u1ea3i ki\u1ec3m tra ng\u1eef ngh\u0129a c\u1ee7a n\u00f3.<\/li>\n
      • B\u01b0\u1edbc 3. T\u1ed1i \u01b0u h\u00f3a: K\u1ebf ho\u1ea1ch th\u1ef1c hi\u1ec7n truy v\u1ea5n \u0111\u01b0\u1ee3c t\u1ea1o trong giai \u0111o\u1ea1n cu\u1ed1i. M\u1ee5c ti\u00eau \u1edf \u0111\u00e2y l\u00e0 t\u00ecm ki\u1ebfm m\u1ed9t k\u1ebf ho\u1ea1ch th\u1ef1c thi truy v\u1ea5n nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y r\u1eb1ng truy v\u1ea5n SQL s\u1ebd mang l\u1ea1i k\u1ebft qu\u1ea3 t\u1ed1t h\u01a1n khi n\u00f3 ph\u1ea3n h\u1ed3i nhanh h\u01a1n. M\u1ed9t k\u1ebf ho\u1ea1ch th\u1ef1c hi\u1ec7n cu\u1ed1i th\u1ef1c t\u1ebf \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p m\u1ed9t s\u1ed1 chi\u1ebfn l\u01b0\u1ee3c kh\u00e1c nhau.<\/li>\n<\/ul>\n

        \u0110\u1ecdc th\u00eam:<\/strong> Data Analyst vs. Data Scientist: Ph\u00e2n Bi\u1ec7t Ra Sao? <\/p>\n

        <\/span>T\u1ea1i sao b\u1ea1n n\u00ean h\u1ecdc ng\u00f4n ng\u1eef SQL?\u00a0<\/strong><\/span><\/h2>\n

        L\u00fd do b\u1ea1n n\u00ean h\u1ecdc ng\u00f4n ng\u1eef SQL l\u00e0 g\u00ec?\u00a0<\/p>\n

        SQL c\u00f3 nh\u1eefng l\u1ee3i \u00edch c\u1ef1c k\u1ef3 th\u00e2n thi\u1ec7n v\u1edbi ng\u01b0\u1eddi d\u00f9ng cho b\u1ea5t c\u1ee9 ai truy c\u1eadp v\u00e0o n\u1ec1n t\u1ea3ng n\u00e0y. H\u00e3y c\u00f9ng Ch\u00fang t\u00f4i tr\u1ea3 l\u1eddi l\u00fd do b\u1ea1n n\u00ean h\u1ecdc ng\u00f4n ng\u1eef n\u00e0y nh\u00e9!\u00a0<\/p>\n

        <\/span>SQL l\u00e0 ng\u00f4n ng\u1eef linh \u0111\u1ed9ng<\/strong><\/span><\/h3>\n

        SQL l\u00e0 m\u1ed9t ng\u00f4n ng\u1eef di \u0111\u1ed9ng, c\u00f3 ngh\u0129a l\u00e0 n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c di chuy\u1ec3n tr\u00ean nhi\u1ec1u h\u1ec7 th\u1ed1ng, bao g\u1ed3m m\u00e1y t\u00ednh x\u00e1ch tay, m\u00e1y ch\u1ee7, m\u00e1y t\u00ednh \u0111\u1ec3 b\u00e0n v\u00e0 th\u1eadm ch\u00ed m\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb di \u0111\u1ed9ng. Ng\u00f4n ng\u1eef n\u00e0y c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean m\u1ea1ng n\u1ed9i b\u1ed9 v\u00e0 m\u1ea1ng internet khu v\u1ef1c.<\/p>\n

        <\/span>X\u1eed l\u00fd truy v\u1ea5n nhanh<\/strong><\/span><\/h3>\n

        SQL c\u00f3 kh\u1ea3 n\u0103ng ch\u00e8n, x\u00f3a, truy xu\u1ea5t v\u00e0 thay \u0111\u1ed5i d\u1eef li\u1ec7u nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3 trong khi v\u1eabn duy tr\u00ec \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a d\u1eef li\u1ec7u, b\u1ea5t k\u1ec3 kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u. \u0110i\u1ec1u n\u00e0y gi\u00fap m\u1ecdi ng\u01b0\u1eddi c\u00f3 th\u1ec3 chia s\u1ebb d\u1eef li\u1ec7u nhanh ch\u00f3ng.<\/p>\n

        <\/span>Kh\u00f4ng c\u1ea7n ki\u1ebfn th\u1ee9c l\u1eadp tr\u00ecnh<\/strong><\/span><\/h3>\n

        Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1c ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh kh\u00e1c, SQL kh\u00f4ng y\u00eau c\u1ea7u ki\u1ebfn th\u1ee9c l\u1eadp tr\u00ecnh. T\u1ea5t c\u1ea3 ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 qu\u1ea3n l\u00fd SQL v\u1edbi s\u1ef1 h\u1ed7 tr\u1ee3 c\u1ee7a c\u00e1c t\u1eeb kh\u00f3a nh\u01b0 \u201ct\u1ea1o\u201d, \u201cch\u00e8n\u201d, \u201cch\u1ecdn\u201d, \u201cc\u1eadp nh\u1eadt\u201d v\u00e0 c\u00e1c t\u1eeb kh\u00f3a kh\u00e1c m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft b\u1ea5t k\u1ef3 kh\u1ea3 n\u0103ng l\u1eadp tr\u00ecnh n\u00e0o v\u00ec ch\u1ea5t l\u01b0\u1ee3ng th\u00e2n thi\u1ec7n v\u1edbi ng\u01b0\u1eddi d\u00f9ng c\u1ee7a n\u00f3.<\/p>\n

        <\/span>Ng\u00f4n ng\u1eef chu\u1ea9n h\u00f3a v\u00e0 n\u1ec1n t\u1ea3ng th\u1ed1ng nh\u1ea5t<\/strong><\/span><\/h3>\n

        B\u1edfi v\u00ec SQL s\u1eed d\u1ee5ng ti\u1ebfng Anh l\u00e0m ng\u00f4n ng\u1eef chu\u1ea9n c\u1ee7a n\u00f3, n\u00ean m\u1ecdi ng\u01b0\u1eddi d\u00f9ng \u0111\u1ec1u c\u00f3 th\u1ec3 hi\u1ec3u, h\u1ecdc, vi\u1ebft v\u00e0 th\u00f4ng d\u1ecbch m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n. SQL c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c \u0111\u1ed1i v\u1edbi t\u1ea5t c\u1ea3 m\u1ecdi ng\u01b0\u1eddi, \u0111\u1eb7c bi\u1ec7t l\u00e0 nh\u1eefng ng\u01b0\u1eddi c\u00f3 \u00edt ho\u1eb7c kh\u00f4ng c\u00f3 ki\u1ebfn th\u1ee9c tr\u01b0\u1edbc \u0111\u00f3, nh\u1edd c\u00e1c thu\u1eadt ng\u1eef v\u00e0 c\u00e2u ti\u1ebfng Anh.<\/p>\n

        <\/span>Cung c\u1ea5p nhi\u1ec1u ch\u1ebf \u0111\u1ed9 xem d\u1eef li\u1ec7u<\/strong><\/span><\/h3>\n

        Nhi\u1ec1u ch\u1ebf \u0111\u1ed9 xem d\u1eef li\u1ec7u c\u00f3 s\u1eb5n nh\u1edd SQL, cho ph\u00e9p nh\u1eefng ng\u01b0\u1eddi d\u00f9ng kh\u00e1c nhau ki\u1ec3m tra c\u1ea5u tr\u00fac v\u00e0 n\u1ed9i dung c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u theo nh\u1eefng c\u00e1ch kh\u00e1c nhau.<\/p>\n

        <\/span>M\u00e3 ngu\u1ed3n m\u1edf\u00a0<\/strong><\/span><\/h3>\n

        C\u01a1 s\u1edf d\u1eef li\u1ec7u SQL c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c cung c\u1ea5p th\u00f4ng qua c\u00e1c h\u1ec7 th\u1ed1ng SQL m\u00e3 ngu\u1ed3n m\u1edf nh\u01b0 MySQL, MariaDB v\u00e0 PostgreSQL. C\u00e1c th\u1ecb tr\u1ea5n l\u1edbn h\u01a1n c\u00f3 th\u1ec3 tham gia v\u00e0o vi\u1ec7c n\u00e0y v\u1edbi chi ph\u00ed th\u1ea5p h\u01a1n.<\/p>\n

        <\/span>C\u00e1c nh\u00e0 cung c\u1ea5p h\u00e0ng \u0111\u1ea7u c\u1ee7a h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u (DBMS) s\u1eed d\u1ee5ng SQL<\/strong><\/span><\/h3>\n

        Do nh\u1eefng l\u1ee3i th\u1ebf l\u1edbn m\u00e0 SQL mang l\u1ea1i, c\u00e1c doanh nghi\u1ec7p h\u00e0ng \u0111\u1ea7u nh\u01b0 IBM, Oracle v\u00e0 Microsoft s\u1eed d\u1ee5ng SQL trong h\u1ec7 th\u1ed1ng DBMS c\u1ee7a h\u1ecd.<\/p>\n

        <\/span>Ng\u00f4n ng\u1eef c\u00f3 th\u1ec3 t\u01b0\u01a1ng t\u00e1c<\/strong><\/span><\/h3>\n

        SQL l\u00e0 m\u1ed9t ng\u00f4n ng\u1eef t\u01b0\u01a1ng t\u00e1c. Do \u0111\u00f3, n\u00f3 l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng hi\u1ec3u nh\u1ea7m ho\u1eb7c giao ti\u1ebfp k\u00e9m gi\u1eefa ng\u01b0\u1eddi d\u00f9ng. <\/p>\n

        K\u1ebft lu\u1eadn<\/strong><\/p>\n

        Hi\u1ec7n nay, c\u00e1c c\u00f4ng ty l\u1edbn, v\u1edbi ngu\u1ed3n c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u1ed5ng l\u1ed3 \u0111\u1ec1u s\u1eed d\u1ee5ng SQL trong vi\u1ec7c x\u00e2y d\u1ef1ng v\u00e0 truy v\u1ea5n \u0111i\u1ec1u n\u00e0y m\u1edf ra c\u01a1 h\u1ed9i vi\u1ec7c l\u00e0m r\u1ea5t t\u1ed1t cho nh\u1eefng b\u1ea1n tr\u1ebb \u0111ang trong qu\u00e1 tr\u00ecnh t\u00ecm ki\u1ebfm vi\u1ec7c l\u00e0m trong ng\u00e0nh d\u1eef li\u1ec7u n\u00e0y.
        Ch\u00fang t\u00f4i hy v\u1ecdng, v\u1edbi b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n \u0111\u00e3 c\u00f3 th\u1ec3 hi\u1ec3u th\u00eam v\u1ec1 t\u1ed5ng quan ng\u00f4n ng\u1eef SQL, vi\u1ec7c nghi\u00ean c\u1ee9u ng\u00f4n ng\u1eef n\u00e0y kh\u00f4ng bao gi\u1edd l\u00e0 qu\u00e1 mu\u1ed9n, b\u1ea1n h\u00e3y b\u1eaft \u0111\u1ea7u ngay h\u00f4m nay \u0111\u1ec3 m\u1edf r\u1ed9ng con \u0111\u01b0\u1eddng ph\u00e1t tri\u1ec3n s\u1ef1 nghi\u1ec7p trong t\u01b0\u01a1ng lai b\u1ea1n nh\u00e9!\u00a0<\/p>\n

        <\/p>\n

        <\/div>\n
        \n
        <\/div>\n<\/p><\/div>\n

        <\/p>\n

        <\/div>\n

        <\/p>\n

        <\/div>\n

        <\/p>\n

        \"t\u1ea3i\"t\u1ea3i<\/div>\n

        \n <\/div>","protected":false},"excerpt":{"rendered":"

        Ng\u00e0y nay, ng\u00e0nh ph\u00e2n t\u00edch d\u1eef li\u1ec7u ng\u00e0y c\u00e0ng tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn v\u00e0 ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai. N\u1ebfu b\u1ea1n \u0111ang mu\u1ed1n t\u00ecm hi\u1ec3u v\u1ec1 ng\u00e0nh ph\u00e2n t\u00edch d\u1eef li\u1ec7u, ch\u1eafc ch\u1eafn b\u1ea1n s\u1ebd ph\u1ea3i bi\u1ebft \u0111\u1ebfn ng\u00f4n ng\u1eef SQL. Ng\u00f4n ng\u1eef SQL th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft trong qu\u00e1 tr\u00ecnh x\u00e2y d\u1ef1ng, qu\u1ea3n tr\u1ecb […]<\/p>\n","protected":false},"author":1,"featured_media":6817,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[],"class_list":["post-5066","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cong-nghe"],"_links":{"self":[{"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/posts\/5066","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/comments?post=5066"}],"version-history":[{"count":1,"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/posts\/5066\/revisions"}],"predecessor-version":[{"id":6818,"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/posts\/5066\/revisions\/6818"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/media\/6817"}],"wp:attachment":[{"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/media?parent=5066"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/categories?post=5066"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mhgvietnam.com\/en\/wp-json\/wp\/v2\/tags?post=5066"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}