{"id":579709,"date":"2023-12-28T03:11:06","date_gmt":"2023-12-28T03:11:06","guid":{"rendered":"https:\/\/proxyelite.info\/glossary\/sql-structured-query-language\/"},"modified":"2023-12-28T03:11:06","modified_gmt":"2023-12-28T03:11:06","slug":"sql-structured-query-language","status":"publish","type":"glossary","link":"https:\/\/proxyelite.info\/vi\/glossary\/sql-structured-query-language\/","title":{"rendered":"SQL (Ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac)"},"content":{"rendered":"<h2>Th\u00f4ng tin t\u00f3m t\u1eaft v\u1ec1 SQL (Ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac)<\/h2>\n<p>SQL, vi\u1ebft t\u1eaft c\u1ee7a Ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac, l\u00e0 ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh m\u1ea1nh m\u1ebd v\u00e0 ti\u00eau chu\u1ea9n h\u00f3a \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ch\u1ee7 y\u1ebfu \u0111\u1ec3 qu\u1ea3n l\u00fd v\u00e0 thao t\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7. N\u00f3 l\u00e0 m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu trong b\u1ed1i c\u1ea3nh c\u00f4ng ngh\u1ec7 th\u00f4ng tin, \u0111\u00f3ng vai tr\u00f2 l\u00e0 ng\u00f4n ng\u1eef ph\u1ed5 qu\u00e1t \u0111\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u01a1 s\u1edf d\u1eef li\u1ec7u. SQL cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng truy xu\u1ea5t, c\u1eadp nh\u1eadt, ch\u00e8n v\u00e0 x\u00f3a d\u1eef li\u1ec7u kh\u1ecfi c\u01a1 s\u1edf d\u1eef li\u1ec7u, c\u0169ng nh\u01b0 x\u00e1c \u0111\u1ecbnh v\u00e0 s\u1eeda \u0111\u1ed5i c\u1ea5u tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u. B\u00e0i vi\u1ebft n\u00e0y \u0111i s\u00e2u v\u00e0o c\u00e1c kh\u00eda c\u1ea1nh kh\u00e1c nhau c\u1ee7a SQL, c\u00e1c lo\u1ea1i, t\u00ednh n\u0103ng ch\u00ednh, c\u00e1ch s\u1eed d\u1ee5ng, th\u00e1ch th\u1ee9c, so s\u00e1nh, tri\u1ec3n v\u1ecdng trong t\u01b0\u01a1ng lai v\u00e0 s\u1ee9c m\u1ea1nh t\u1ed5ng h\u1ee3p c\u1ee7a n\u00f3 v\u1edbi c\u00e1c m\u00e1y ch\u1ee7 proxy.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 SQL (Ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac)<\/h2>\n<p>SQL \u0111\u01b0\u1ee3c IBM ph\u00e1t tri\u1ec3n l\u1ea7n \u0111\u1ea7u ti\u00ean v\u00e0o nh\u1eefng n\u0103m 1970, nh\u01b0 m\u1ed9t ph\u01b0\u01a1ng ti\u1ec7n \u0111\u1ec3 truy c\u1eadp v\u00e0 thao t\u00e1c d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong c\u00e1c h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7 (RDBMS). K\u1ec3 t\u1eeb \u0111\u00f3, n\u00f3 \u0111\u00e3 tr\u1ea3i qua nhi\u1ec1u l\u1ea7n l\u1eb7p l\u1ea1i v\u00e0 ti\u00eau chu\u1ea9n h\u00f3a, trong \u0111\u00f3 SQL-92 l\u00e0 m\u1ed9t trong nh\u1eefng phi\u00ean b\u1ea3n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t.<\/p>\n<p>SQL \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u00ec t\u00ednh linh ho\u1ea1t v\u00e0 d\u1ec5 s\u1eed d\u1ee5ng. N\u00f3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean m\u1ed9t nguy\u00ean t\u1eafc \u0111\u01a1n gi\u1ea3n nh\u01b0ng m\u1ea1nh m\u1ebd: s\u1eed d\u1ee5ng c\u00e1c c\u00e2u l\u1ec7nh khai b\u00e1o \u0111\u1ec3 m\u00f4 t\u1ea3 d\u1eef li\u1ec7u n\u00e0o c\u1ea7n \u0111\u01b0\u1ee3c truy xu\u1ea5t ho\u1eb7c thao t\u00e1c, thay v\u00ec ch\u1ec9 \u0111\u1ecbnh c\u00e1ch th\u1ef1c hi\u1ec7n. L\u1edbp tr\u1eebu t\u01b0\u1ee3ng n\u00e0y cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng t\u1eadp trung v\u00e0o \u201cc\u00e1i g\u00ec\u201d thay v\u00ec \u201cl\u00e0m th\u1ebf n\u00e0o\u201d, gi\u00fap c\u1ea3 ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u v\u00e0 chuy\u00ean gia \u0111\u1ec1u c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c.<\/p>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a SQL (Ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac)<\/h2>\n<p>SQL t\u1ef1 h\u00e0o c\u00f3 m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng ch\u00ednh khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh n\u1ec1n t\u1ea3ng c\u1ee7a qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u:<\/p>\n<ol>\n<li>\n<p><strong>Ph\u1ee5c h\u1ed3i d\u1eef li\u1ec7u<\/strong>: SQL cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng truy xu\u1ea5t d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 t\u1eeb m\u1ed9t ho\u1eb7c nhi\u1ec1u b\u1ea3ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng truy v\u1ea5n. C\u00e2u l\u1ec7nh SELECT l\u00e0 c\u01a1 b\u1ea3n cho m\u1ee5c \u0111\u00edch n\u00e0y.<\/p>\n<\/li>\n<li>\n<p><strong>Thao t\u00e1c d\u1eef li\u1ec7u<\/strong>: Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 s\u1eeda \u0111\u1ed5i, ch\u00e8n v\u00e0 x\u00f3a b\u1ea3n ghi trong b\u1ea3ng b\u1eb1ng SQL. C\u00e1c c\u00e2u l\u1ec7nh INSERT, UPDATE v\u00e0 DELETE r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c thao t\u00e1c n\u00e0y.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1ecbnh ngh\u0129a d\u1eef li\u1ec7u<\/strong>: SQL cho ph\u00e9p t\u1ea1o, thay \u0111\u1ed5i v\u00e0 x\u00f3a c\u00e1c c\u1ea5u tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u nh\u01b0 b\u1ea3ng, d\u1ea1ng xem v\u00e0 ch\u1ec9 m\u1ee5c. C\u00e1c c\u00e2u l\u1ec7nh CREATE, ALTER v\u00e0 DROP t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho c\u00e1c t\u00e1c v\u1ee5 n\u00e0y.<\/p>\n<\/li>\n<li>\n<p><strong>To\u00e0n v\u1eb9n d\u1eef li\u1ec7u<\/strong>: SQL h\u1ed7 tr\u1ee3 tri\u1ec3n khai c\u00e1c r\u00e0ng bu\u1ed9c \u0111\u1ec3 duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u, \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u tu\u00e2n th\u1ee7 c\u00e1c quy t\u1eafc \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc.<\/p>\n<\/li>\n<li>\n<p><strong>Giao d\u1ecbch<\/strong>: N\u00f3 cung c\u1ea5p c\u00e1c l\u1ec7nh ki\u1ec3m so\u00e1t giao d\u1ecbch (BEGIN, COMMIT, ROLLBACK) \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n c\u1ee7a d\u1eef li\u1ec7u trong c\u00e1c ho\u1ea1t \u0111\u1ed9ng ph\u1ee9c t\u1ea1p.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i SQL (Ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac)<\/h2>\n<p>SQL c\u00f3 nhi\u1ec1u lo\u1ea1i, m\u1ed7i lo\u1ea1i c\u00f3 c\u00e1c t\u00ednh n\u0103ng v\u00e0 ph\u1ea7n m\u1edf r\u1ed9ng ri\u00eang. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 lo\u1ea1i SQL n\u1ed5i b\u1eadt:<\/p>\n<table>\n<thead>\n<tr>\n<th>Ki\u1ec3u<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>MySQL<\/strong><\/td>\n<td>M\u1ed9t RDBMS ngu\u1ed3n m\u1edf \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi t\u1ed1c \u0111\u1ed9 v\u00e0 \u0111\u1ed9 tin c\u1eady.<\/td>\n<\/tr>\n<tr>\n<td><strong>Oracle SQL<\/strong><\/td>\n<td>\u0110\u01b0\u1ee3c ph\u00e1t tri\u1ec3n b\u1edfi t\u1eadp \u0111o\u00e0n Oracle, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c doanh nghi\u1ec7p.<\/td>\n<\/tr>\n<tr>\n<td><strong>PostgreSQL<\/strong><\/td>\n<td>M\u1ed9t RDBMS ngu\u1ed3n m\u1edf \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi c\u00e1c t\u00ednh n\u0103ng n\u00e2ng cao.<\/td>\n<\/tr>\n<tr>\n<td><strong>M\u00e1y ch\u1ee7 SQL<\/strong><\/td>\n<td>Gi\u1ea3i ph\u00e1p RDBMS c\u1ee7a Microsoft v\u1edbi s\u1ef1 h\u1ed7 tr\u1ee3 m\u1ea1nh m\u1ebd d\u00e0nh cho doanh nghi\u1ec7p.<\/td>\n<\/tr>\n<tr>\n<td><strong>SQLite<\/strong><\/td>\n<td>M\u1ed9t RDBMS \u0111\u1ed9c l\u1eadp, kh\u00f4ng c\u00f3 m\u00e1y ch\u1ee7 v\u00e0 kh\u00f4ng c\u00f3 c\u1ea5u h\u00ecnh.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng SQL (Ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac)<\/h2>\n<p>SQL t\u00ecm th\u1ea5y c\u00e1c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n<ul>\n<li>\n<p><strong>Ph\u00e1t tri\u1ec3n web<\/strong>: C\u01a1 s\u1edf d\u1eef li\u1ec7u SQL h\u1ed7 tr\u1ee3 c\u00e1c trang web \u0111\u1ed9ng b\u1eb1ng c\u00e1ch l\u01b0u tr\u1eef v\u00e0 truy xu\u1ea5t d\u1eef li\u1ec7u m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<\/li>\n<li>\n<p><strong>Kinh doanh th\u00f4ng minh<\/strong>: SQL r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 t\u1ea1o b\u00e1o c\u00e1o v\u00e0 tr\u00edch xu\u1ea5t th\u00f4ng tin chuy\u00ean s\u00e2u t\u1eeb kho d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e2n t\u00edch d\u1eef li\u1ec7u<\/strong>: C\u00e1c nh\u00e0 khoa h\u1ecdc d\u1eef li\u1ec7u s\u1eed d\u1ee5ng SQL \u0111\u1ec3 kh\u00e1m ph\u00e1, l\u00e0m s\u1ea1ch v\u00e0 ph\u00e2n t\u00edch c\u00e1c t\u1eadp d\u1eef li\u1ec7u l\u1edbn.<\/p>\n<\/li>\n<li>\n<p><strong>\u1ee8ng d\u1ee5ng di \u0111\u1ed9ng<\/strong>: Nhi\u1ec1u \u1ee9ng d\u1ee5ng di \u0111\u1ed9ng d\u1ef1a v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u SQL \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u c\u1ee5c b\u1ed9.<\/p>\n<\/li>\n<\/ul>\n<h3>Nh\u1eefng th\u00e1ch th\u1ee9c v\u00e0 gi\u1ea3i ph\u00e1p SQL ph\u1ed5 bi\u1ebfn<\/h3>\n<ol>\n<li>\n<p><strong>Hi\u1ec7u su\u1ea5t<\/strong>: C\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a c\u00e1c truy v\u1ea5n ch\u1eadm b\u1eb1ng c\u00e1ch t\u1ea1o ch\u1ec9 m\u1ee5c, gi\u1ea3m thi\u1ec3u vi\u1ec7c s\u1eed d\u1ee5ng k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n v\u00e0 l\u01b0u k\u1ebft qu\u1ea3 truy v\u1ea5n v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/p>\n<\/li>\n<li>\n<p><strong>B\u1ea3o v\u1ec7<\/strong>: C\u00f3 th\u1ec3 ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng ti\u00eam nhi\u1ec5m SQL b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c truy v\u1ea5n \u0111\u01b0\u1ee3c tham s\u1ed1 h\u00f3a v\u00e0 x\u00e1c th\u1ef1c \u0111\u1ea7u v\u00e0o.<\/p>\n<\/li>\n<li>\n<p><strong>Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng<\/strong>: C\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c quy m\u00f4 theo chi\u1ec1u ngang b\u1eb1ng c\u00e1ch ph\u00e2n chia ho\u1eb7c s\u1eed d\u1ee5ng c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u00e2n t\u00e1n.<\/p>\n<\/li>\n<li>\n<p><strong>Sao l\u01b0u d\u1eef li\u1ec7u<\/strong>: Sao l\u01b0u th\u01b0\u1eddng xuy\u00ean \u0111\u1ea3m b\u1ea3o ph\u1ee5c h\u1ed3i d\u1eef li\u1ec7u trong tr\u01b0\u1eddng h\u1ee3p c\u00f3 l\u1ed7i.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh kh\u00e1c v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<p>H\u00e3y so s\u00e1nh SQL v\u1edbi m\u1ed9t s\u1ed1 thu\u1eadt ng\u1eef li\u00ean quan:<\/p>\n<table>\n<thead>\n<tr>\n<th>Thu\u1eadt ng\u1eef<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>NoSQL<\/strong><\/td>\n<td>M\u1ed9t h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00f4ng d\u1ef1a v\u00e0o l\u01b0\u1ee3c \u0111\u1ed3 c\u1ed1 \u0111\u1ecbnh, ph\u00f9 h\u1ee3p v\u1edbi d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac ho\u1eb7c b\u00e1n c\u1ea5u tr\u00fac.<\/td>\n<\/tr>\n<tr>\n<td><strong>DDL<\/strong> (Ng\u00f4n ng\u1eef \u0111\u1ecbnh ngh\u0129a d\u1eef li\u1ec7u)<\/td>\n<td>M\u1ed9t t\u1eadp h\u1ee3p con SQL \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u00e0 s\u1eeda \u0111\u1ed5i c\u1ea5u tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/td>\n<\/tr>\n<tr>\n<td><strong>DML<\/strong> (Ng\u00f4n ng\u1eef thao t\u00e1c d\u1eef li\u1ec7u)<\/td>\n<td>M\u1ed9t t\u1eadp h\u1ee3p con SQL \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 truy v\u1ea5n v\u00e0 thao t\u00e1c d\u1eef li\u1ec7u.<\/td>\n<\/tr>\n<tr>\n<td><strong>axit<\/strong> (T\u00ednh nguy\u00ean t\u1eed, t\u00ednh nh\u1ea5t qu\u00e1n, s\u1ef1 c\u00f4 l\u1eadp, \u0111\u1ed9 b\u1ec1n)<\/td>\n<td>C\u00e1c thu\u1ed9c t\u00ednh \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady c\u1ee7a c\u00e1c giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1c quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 trong t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn SQL (Ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac)<\/h2>\n<p>SQL ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n v\u1edbi nh\u1eefng ti\u1ebfn b\u1ed9 c\u00f4ng ngh\u1ec7. M\u1ed9t s\u1ed1 xu h\u01b0\u1edbng v\u00e0 c\u00f4ng ngh\u1ec7 \u0111\u1ecbnh h\u00ecnh t\u01b0\u01a1ng lai c\u1ee7a SQL bao g\u1ed3m:<\/p>\n<ul>\n<li>\n<p><strong>T\u00edch h\u1ee3p d\u1eef li\u1ec7u l\u1edbn<\/strong>: SQL ng\u00e0y c\u00e0ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u h\u01a1n c\u00f9ng v\u1edbi c\u00e1c c\u00f4ng ngh\u1ec7 d\u1eef li\u1ec7u l\u1edbn nh\u01b0 Apache Hadoop v\u00e0 Spark.<\/p>\n<\/li>\n<li>\n<p><strong>AI v\u00e0 h\u1ecdc m\u00e1y<\/strong>: SQL ng\u00e0y c\u00e0ng tr\u1edf n\u00ean t\u00edch h\u1ee3p h\u01a1n trong vi\u1ec7c qu\u1ea3n l\u00fd v\u00e0 ph\u00e2n t\u00edch d\u1eef li\u1ec7u cho c\u00e1c \u1ee9ng d\u1ee5ng AI v\u00e0 machine learning.<\/p>\n<\/li>\n<li>\n<p><strong>C\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00f4ng c\u00f3 m\u00e1y ch\u1ee7<\/strong>: S\u1ef1 gia t\u0103ng c\u1ee7a \u0111i\u1ec7n to\u00e1n kh\u00f4ng m\u00e1y ch\u1ee7 \u0111ang t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn c\u01a1 s\u1edf d\u1eef li\u1ec7u SQL, khi\u1ebfn ch\u00fang tr\u1edf n\u00ean linh ho\u1ea1t h\u01a1n v\u00e0 ti\u1ebft ki\u1ec7m chi ph\u00ed h\u01a1n.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi SQL (Ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac)<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong c\u00e1c t\u00e1c v\u1ee5 li\u00ean quan \u0111\u1ebfn SQL, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c t\u00ecnh hu\u1ed1ng m\u00e0 quy\u1ec1n ri\u00eang t\u01b0 v\u00e0 b\u1ea3o m\u1eadt d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1eb7t l\u00ean h\u00e0ng \u0111\u1ea7u. \u0110\u00e2y l\u00e0 c\u00e1ch ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft:<\/p>\n<ol>\n<li>\n<p><strong>Ki\u1ec3m so\u00e1t truy c\u1eadp<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 th\u1ef1c thi c\u00e1c ch\u00ednh s\u00e1ch ki\u1ec3m so\u00e1t truy c\u1eadp, \u0111\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ec9 nh\u1eefng ng\u01b0\u1eddi d\u00f9ng \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n m\u1edbi c\u00f3 th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u01a1 s\u1edf d\u1eef li\u1ec7u SQL.<\/p>\n<\/li>\n<li>\n<p><strong>\u1ea9n danh<\/strong>: Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u00e1y ch\u1ee7 proxy \u0111\u1ec3 \u1ea9n danh c\u00e1c truy v\u1ea5n SQL c\u1ee7a h\u1ecd, g\u00e2y kh\u00f3 kh\u0103n cho vi\u1ec7c truy t\u00ecm ngu\u1ed3n g\u1ed1c c\u1ee7a ch\u00fang.<\/p>\n<\/li>\n<li>\n<p><strong>C\u00e2n b\u1eb1ng t\u1ea3i<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 ph\u00e2n ph\u1ed1i c\u00e1c truy v\u1ea5n SQL tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ec3 c\u00e2n b\u1eb1ng t\u1ea3i v\u00e0 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t.<\/p>\n<\/li>\n<li>\n<p><strong>B\u1ea3o v\u1ec7<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t b\u1ed9 \u0111\u1ec7m gi\u1eefa c\u00e1c m\u00e1y kh\u00e1ch b\u00ean ngo\u00e0i v\u00e0 c\u01a1 s\u1edf d\u1eef li\u1ec7u SQL, b\u1ea3o v\u1ec7 kh\u1ecfi c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng ti\u00eam nhi\u1ec5m SQL v\u00e0 c\u00e1c m\u1ed1i \u0111e d\u1ecda b\u1ea3o m\u1eadt kh\u00e1c.<\/p>\n<\/li>\n<\/ol>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 SQL (Ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac) v\u00e0 c\u00e1c kh\u00eda c\u1ea1nh kh\u00e1c nhau c\u1ee7a n\u00f3, b\u1ea1n c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ul>\n<li><a target=\"_new\" rel=\"noopener\">H\u01b0\u1edbng d\u1eabn SQL c\u1ee7a W3Schools<\/a><\/li>\n<li><a target=\"_new\" rel=\"noopener\">T\u00e0i li\u1ec7u Oracle SQL<\/a><\/li>\n<li><a target=\"_new\" rel=\"noopener\">T\u00e0i li\u1ec7u v\u1ec1 m\u00e1y ch\u1ee7 Microsoft SQL<\/a><\/li>\n<\/ul>\n<p>SQL l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a qu\u1ea3n l\u00fd d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i v\u00e0 \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng trong c\u00e1c ng\u00e0nh. T\u00ednh linh ho\u1ea1t, kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng v\u00e0 s\u1ef1 ph\u00e1t tri\u1ec3n li\u00ean t\u1ee5c c\u1ee7a n\u00f3 l\u00e0m cho n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t c\u00f4ng c\u1ee5 quan tr\u1ecdng cho c\u00e1c doanh nghi\u1ec7p c\u0169ng nh\u01b0 c\u00e1c chuy\u00ean gia d\u1eef li\u1ec7u.<\/p>","protected":false},"featured_media":579710,"menu_order":0,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-579709","glossary","type-glossary","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/proxyelite.info\/vi\/wp-json\/wp\/v2\/glossary\/579709","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/proxyelite.info\/vi\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/proxyelite.info\/vi\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":0,"href":"https:\/\/proxyelite.info\/vi\/wp-json\/wp\/v2\/glossary\/579709\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/proxyelite.info\/vi\/wp-json\/wp\/v2\/media\/579710"}],"wp:attachment":[{"href":"https:\/\/proxyelite.info\/vi\/wp-json\/wp\/v2\/media?parent=579709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}