{"id":299498,"date":"2023-12-24T11:27:58","date_gmt":"2023-12-24T04:27:58","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=299498"},"modified":"2023-12-24T11:28:00","modified_gmt":"2023-12-24T04:28:00","slug":"inner-join-trong-sql","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/","title":{"rendered":"INNER JOIN trong SQL"},"content":{"rendered":"<p>Trong c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 truy v\u1ea5n SQL, INNER JOIN l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m quan tr\u1ecdng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 k\u1ebft h\u1ee3p d\u1eef li\u1ec7u t\u1eeb nhi\u1ec1u b\u1ea3ng kh\u00e1c nhau. V\u1edbi <strong>INNER JOIN trong SQL<\/strong>, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c truy v\u1ea5n ph\u1ee9c t\u1ea1p v\u00e0 m\u1ea1nh m\u1ebd, cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c b\u1ea3ng v\u00e0 d\u1eef li\u1ec7u. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i s\u1ebd gi\u1edbi thi\u1ec7u chi ti\u1ebft v\u1ec1 c\u00e2u l\u1ec7nh n\u00e0y qua nh\u1eefng th\u00f4ng tin d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<h2>Gi\u1edbi thi\u1ec7u SQL v\u00e0 m\u1ed9t s\u1ed1 kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n v\u1ec1 JOIN<\/h2>\n<p>SQL l\u00e0 m\u1ed9t ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh \u0111\u1eb7c th\u00f9 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u0111\u1ec3 l\u01b0u tr\u1eef, x\u1eed l\u00fd v\u00e0 tr\u00edch xu\u1ea5t d\u1eef li\u1ec7u trong c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7. Ng\u00f4n ng\u1eef n\u00e0y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng b\u1edfi nhi\u1ec1u \u1ee9ng d\u1ee5ng v\u00e0 t\u1ed5 ch\u1ee9c \u0111\u1ec3 qu\u1ea3n l\u00fd v\u00e0 ph\u00e2n t\u00edch d\u1eef li\u1ec7u. SQL c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng v\u1edbi nhi\u1ec1u h\u1ec7 qu\u1ea3n tr\u1ecb c\u01a1 s\u1edf d\u1eef li\u1ec7u (DBMS) kh\u00e1c nhau nh\u01b0 MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres,&#8230;<\/p>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/inner-join-trong-sql-2\/\" rel=\"attachment wp-att-299500\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-2.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-2-300x200.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-2-768x512.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-299500 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-2.jpg\" alt=\"inner-join-trong-sql-2\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-2-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-2-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/a><\/p>\n<p>JOIN l\u00e0 m\u1ed9t to\u00e1n t\u1eed k\u1ebft n\u1ed1i d\u1eef li\u1ec7u t\u1eeb nhi\u1ec1u b\u1ea3ng v\u1edbi nhau. Khi b\u1ea1n c\u1ea7n truy v\u1ea5n v\u00e0o c\u1ed9t d\u1eef li\u1ec7u t\u1eeb nhi\u1ec1u b\u1ea3ng kh\u00e1c nhau \u0111\u1ec3 tr\u1ea3 v\u1ec1 chung m\u1ed9t t\u1eadp k\u1ebft qu\u1ea3, b\u1ea1n c\u1ea7n s\u1eed d\u1ee5ng c\u00e2u l\u1ec7nh n\u00e0y. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, 2 b\u1ea3ng k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c v\u1edbi nhau khi c\u00f3 1 d\u1eef li\u1ec7u chung gi\u1eefa 2 b\u1ea3ng. C\u00f3 nhi\u1ec1u lo\u1ea1i JOIN trong SQ, nh\u01b0 INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN v\u00e0 SELF JOIN. M\u1ed7i lo\u1ea1i JOIN c\u00f3 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng v\u00e0 k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 kh\u00e1c nhau.<\/p>\n<p>INNER JOIN trong SQL l\u00e0 m\u1ed9t lo\u1ea1i JOIN ph\u1ed5 bi\u1ebfn nh\u1ea5t, n\u00f3 tr\u1ea3 v\u1ec1 c\u00e1c b\u1ea3n ghi c\u00f3 gi\u00e1 tr\u1ecb kh\u1edbp trong c\u1ea3 hai b\u1ea3ng, lo\u1ea1i b\u1ecf c\u00e1c b\u1ea3n ghi kh\u00f4ng kh\u1edbp. INNER JOIN gi\u00fap b\u1ea1n l\u1ecdc ra nh\u1eefng d\u1eef li\u1ec7u li\u00ean quan v\u00e0 ch\u00ednh x\u00e1c gi\u1eefa c\u00e1c b\u1ea3ng, tr\u00e1nh nh\u1eefng d\u1eef li\u1ec7u th\u1eeba ho\u1eb7c sai l\u1ec7ch. INNER JOIN c\u0169ng gi\u00fap b\u1ea1n t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u n\u0103ng c\u1ee7a truy v\u1ea5n, gi\u1ea3m th\u1eddi gian x\u1eed l\u00fd v\u00e0 t\u0103ng t\u1ed1c \u0111\u1ed9 tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 khi s\u1eed d\u1ee5ng.<\/p>\n<h2>\u0110\u1ecbnh ngh\u0129a v\u00e0 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a INNER JOIN trong SQL<\/h2>\n<p>INNER JOIN l\u00e0 m\u1ed9t lo\u1ea1i thao t\u00e1c k\u1ebft n\u1ed1i hai ho\u1eb7c nhi\u1ec1u b\u1ea3ng d\u1eef li\u1ec7u d\u1ef1a tr\u00ean m\u1ed9t \u0111i\u1ec1u ki\u1ec7n so s\u00e1nh gi\u1eefa c\u00e1c c\u1ed9t c\u00f3 gi\u00e1 tr\u1ecb chung. INNER JOIN ch\u1ec9 tr\u1ea3 v\u1ec1 nh\u1eefng b\u1ea3n ghi c\u00f3 gi\u00e1 tr\u1ecb kh\u1edbp nhau \u1edf c\u1ea3 hai b\u1ea3ng, c\u00f2n nh\u1eefng b\u1ea3n ghi kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb kh\u1edbp s\u1ebd b\u1ecb lo\u1ea1i b\u1ecf. C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a INNER JOIN c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c di\u1ec5n ra nh\u01b0 sau:<\/p>\n<ul>\n<li style=\"font-weight: 400;\">SQL s\u1ebd l\u1ea5y t\u1eebng b\u1ea3n ghi trong b\u1ea3ng \u0111\u1ea7u ti\u00ean v\u00e0 so s\u00e1nh gi\u00e1 tr\u1ecb trong c\u1ed9t \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh ch\u1ec9 v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng trong c\u1ed9t c\u1ee7a th\u1ee9 hai trong b\u1ea3ng.<\/li>\n<li style=\"font-weight: 400;\">N\u1ebfu c\u00f3 s\u1ef1 tr\u00f9ng kh\u1edbp gi\u1eefa c\u00e1c gi\u00e1 tr\u1ecb, SQL s\u1ebd k\u1ebft h\u1ee3p c\u00e1c b\u1ea3n ghi t\u1eeb hai b\u1ea3ng d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n kh\u1edbp n\u00e0y v\u00e0 tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3.<\/li>\n<li style=\"font-weight: 400;\">C\u00e1c b\u1ea3n ghi kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p s\u1ebd b\u1ecb lo\u1ea1i b\u1ecf kh\u1ecfi k\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng.<\/li>\n<li style=\"font-weight: 400;\">Qu\u00e1 tr\u00ecnh tr\u00ean s\u1ebd ti\u1ebfp t\u1ee5c cho \u0111\u1ebfn khi t\u1ea5t c\u1ea3 c\u00e1c b\u1ea3n ghi trong b\u1ea3ng \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u00e0 k\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng ch\u1ee9a c\u00e1c b\u1ea3n ghi h\u1ee3p nh\u1ea5t t\u1eeb \u200b\u200bc\u1ea3 hai b\u1ea3ng.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/inner-join-trong-sql-3\/\" rel=\"attachment wp-att-299501\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-3.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-3-300x200.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-3-768x512.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-299501 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-3.jpg\" alt=\"inner-join-trong-sql-3\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-3-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-3-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/a><\/p>\n<p>C\u00fa ph\u00e1p c\u1ee7a INNER JOIN nh\u01b0 sau:<\/p>\n<ul>\n<li><strong>SELECT table1.column1, table1.column2, table2.column1,&#8230;<\/strong><\/li>\n<li><strong>FROM table1<\/strong><\/li>\n<li><strong>INNER JOIN table2<\/strong><\/li>\n<li><strong>ON table1.matching_column = table2.matching_column;<\/strong><\/li>\n<\/ul>\n<p>Trong \u0111\u00f3: Table1, table2 l\u00e0 t\u00ean c\u1ee7a hai b\u1ea3ng c\u1ea7n k\u1ebft n\u1ed1i. Column1, column2 l\u00e0 t\u00ean c\u1ee7a c\u00e1c c\u1ed9t c\u1ea7n l\u1ea5y d\u1eef li\u1ec7u t\u1eeb hai b\u1ea3ng v\u00e0 matching_column l\u00e0 t\u00ean c\u1ee7a c\u1ed9t c\u00f3 gi\u00e1 tr\u1ecb chung gi\u1eefa hai b\u1ea3ng, d\u00f9ng \u0111\u1ec3 l\u00e0m \u0111i\u1ec1u ki\u1ec7n k\u1ebft n\u1ed1i.<\/p>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng INNER JOIN trong c\u00e1c truy v\u1ea5n ph\u1ee9c t\u1ea1p<\/h2>\n<p>Khi x\u1eed l\u00fd c\u00e1c truy v\u1ea5n ph\u1ee9c t\u1ea1p, vi\u1ec7c s\u1eed d\u1ee5ng INNER JOIN l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c v\u00e0 cung c\u1ea5p th\u00f4ng tin c\u1ea7n thi\u1ebft. INNER JOIN c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c truy v\u1ea5n ph\u1ee9c t\u1ea1p tr\u00ean nhi\u1ec1u b\u1ea3ng b\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n v\u00e0 c\u00e1c ph\u00e9p so s\u00e1nh to\u00e1n t\u1eed kh\u00e1c.<\/p>\n<h3>S\u1eed d\u1ee5ng INNER JOIN trong SQL \u0111\u1ec3 k\u1ebft h\u1ee3p nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n<\/h3>\n<p>Ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng INNER JOIN \u0111\u1ec3 k\u1ebft h\u1ee3p nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n trong m\u1ec7nh \u0111\u1ec1 ON, b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c to\u00e1n t\u1eed logic nh\u01b0 AND, OR, NOT. Gi\u1ea3 s\u1eed ch\u00fang ta c\u00f3 hai b\u1ea3ng: b\u1ea3ng SinhVien ch\u1ee9a th\u00f4ng tin v\u1ec1 c\u00e1c sinh vi\u00ean v\u00e0 b\u1ea3ng Diem ch\u1ee9a th\u00f4ng tin v\u1ec1 \u0111i\u1ec3m s\u1ed1 c\u1ee7a c\u00e1c sinh vi\u00ean. Khi mu\u1ed1n truy v\u1ea5n c\u00e1c sinh vi\u00ean c\u00f3 \u0111i\u1ec3m trung b\u00ecnh l\u1edbn h\u01a1n 8 v\u00e0 thu\u1ed9c khoa CNTT.<\/p>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/inner-join-trong-sql-4\/\" rel=\"attachment wp-att-299502\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-4.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-4-300x200.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-4-768x512.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-299502 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-4.jpg\" alt=\"inner-join-trong-sql-4\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-4-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-4-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/a><\/p>\n<p>\u0110\u00e2y l\u00e0 c\u00e1ch s\u1eed d\u1ee5ng INNER JOIN v\u1edbi nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n kh\u00e1c nhau:<\/p>\n<p><strong>SELECT SinhVien.MaSV, SinhVien.HoTen, SinhVien.Khoa, Diem.DTB<\/strong><\/p>\n<p><strong>FROM SinhVien<\/strong><\/p>\n<p><strong>INNER JOIN Diem ON SinhVien.MaSV = Diem.MaSV<\/strong><\/p>\n<p><strong>WHERE Diem.DTB &gt; 8 AND SinhVien.Khoa = &#8216;CNTT&#8217;;<\/strong><\/p>\n<h3>S\u1eed d\u1ee5ng INNER JOIN trong SQL v\u1edbi c\u00e1c ph\u00e9p so s\u00e1nh to\u00e1n t\u1eed kh\u00e1c<\/h3>\n<p>Ngo\u00e0i ph\u00e9p so s\u00e1nh b\u1eb1ng (=), ch\u00fang ta c\u0169ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c ph\u00e9p so s\u00e1nh to\u00e1n t\u1eed kh\u00e1c nh\u01b0 &lt;, &gt;, &lt;=, &gt;=, &lt;&gt;, IN, BETWEEN, LIKE, IS NULL, IS NOT NULL \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111i\u1ec1u ki\u1ec7n li\u00ean k\u1ebft. Gi\u1ea3 s\u1eed n\u1ebfu c\u00f3 hai b\u1ea3ng: b\u1ea3ng NhanVien ch\u1ee9a th\u00f4ng tin v\u1ec1 c\u00e1c nh\u00e2n vi\u00ean v\u00e0 b\u1ea3ng PhongBan ch\u1ee9a th\u00f4ng tin v\u1ec1 c\u00e1c ph\u00f2ng ban. Trong tr\u01b0\u1eddng h\u1ee3p mu\u1ed1n truy v\u1ea5n c\u00e1c nh\u00e2n vi\u00ean c\u00f3 l\u01b0\u01a1ng n\u1eb1m trong kho\u1ea3ng t\u1eeb 10 tri\u1ec7u \u0111\u1ebfn 20 tri\u1ec7u v\u00e0 thu\u1ed9c ph\u00f2ng ban c\u00f3 t\u00ean b\u1eaft \u0111\u1ea7u b\u1eb1ng ch\u1eef K.<\/p>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/inner-join-trong-sql-5-1\/\" rel=\"attachment wp-att-299511\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-5.1.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-5.1-300x200.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-5.1-768x512.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-299511 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-5.1.jpg\" alt=\"inner-join-trong-sql-5\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-5.1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-5.1-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-5.1-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/a><\/p>\n<p>\u0110\u00e2y l\u00e0 c\u00e1ch s\u1eed d\u1ee5ng INNER JOIN v\u1edbi c\u00e1c ph\u00e9p so s\u00e1nh to\u00e1n t\u1eed kh\u00e1c:<\/p>\n<p><strong>SELECT NhanVien.MaNV, NhanVien.HoTen, NhanVien.Luong, PhongBan.TenPB<\/strong><\/p>\n<p><strong>FROM NhanVien<\/strong><\/p>\n<p><strong>INNER JOIN PhongBan ON NhanVien.MaPB = PhongBan.MaPB<\/strong><\/p>\n<p><strong>WHERE NhanVien.Luong BETWEEN 10000000 AND 20000000<\/strong><\/p>\n<p><strong>AND PhongBan.TenPB LIKE &#8216;K%&#8217;;<\/strong><\/p>\n<h2>So s\u00e1nh INNER JOIN trong SQL v\u1edbi c\u00e1c lo\u1ea1i JOIN kh\u00e1c<\/h2>\n<p>Trong SQL, c\u00f3 nhi\u1ec1u lo\u1ea1i JOIN kh\u00e1c nhau \u0111\u1ec3 k\u1ebft h\u1ee3p th\u00f4ng tin t\u1eeb c\u00e1c b\u1ea3ng. M\u1ed7i lo\u1ea1i JOIN \u0111\u1ec1u c\u00f3 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng v\u00e0 \u1ee9ng d\u1ee5ng ri\u00eang. Trong s\u1ed1 \u0111\u00f3, INNER JOIN l\u00e0 m\u1ed9t trong nh\u1eefng lo\u1ea1i JOIN ph\u1ed5 bi\u1ebfn nh\u1ea5t \u1edf th\u1eddi \u0111i\u1ec3m hi\u1ec7n t\u1ea1i. Tuy nhi\u00ean, \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 c\u00e2u l\u1ec7nh n\u00e0y, ta c\u1ea7n so s\u00e1nh n\u00f3 v\u1edbi c\u00e1c lo\u1ea1i JOIN kh\u00e1c. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 so s\u00e1nh gi\u1eefa INNER JOIN v\u00e0 c\u00e1c lo\u1ea1i JOIN kh\u00e1c.<\/p>\n<h3>So s\u00e1nh INNER JOIN v\u1edbi LEFT JOIN<\/h3>\n<p>Khi l\u00e0m vi\u1ec7c v\u1edbi JOIN \u0111\u01b0\u1ee3c ph\u00e9p trong SQL, INNER JOIN v\u00e0 LEFT JOIN l\u00e0 hai lo\u1ea1i bi\u1ebfn ph\u1ed5 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 k\u1ebft h\u1ee3p d\u1eef li\u1ec7u t\u1eeb nhi\u1ec1u b\u1ea3ng. M\u1eb7c d\u00f9 c\u1ea3 hai lo\u1ea1i JOIN n\u00e0y \u0111\u1ec1u c\u00f3 c\u00e1ch k\u1ebft h\u1ee3p d\u1eef li\u1ec7u ti\u00eau chu\u1ea9n, nh\u01b0ng ch\u00fang c\u00f3 nh\u1eefng d\u1eef li\u1ec7u \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong qu\u00e1 tr\u00ecnh ch\u00fang ho\u1ea1t \u0111\u1ed9ng v\u00e0 tr\u1ea3 k\u1ebft qu\u1ea3.<\/p>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/join-3\/\" rel=\"attachment wp-att-299512\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-6.1.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-6.1-300x200.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-6.1-768x512.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-299512 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-6.1.jpg\" alt=\"inner-join-trong-sql-6\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-6.1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-6.1-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-6.1-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/a><\/p>\n<p>INNER JOIN trong SQL ch\u1ec9 tr\u1ea3 v\u1ec1 c\u00e1c b\u1ea3n ghi c\u00f3 gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p trong c\u1ea3 hai b\u1ea3ng. C\u00e1c b\u1ea3n ghi kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p s\u1ebd b\u1ecb lo\u1ea1i b\u1ecf kh\u1ecfi k\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 ch\u1ec9 nh\u1eefng b\u1ea3n ghi c\u00f3 gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p trong c\u1ea3 b\u1ea3ng tr\u00e1i v\u00e0 b\u1ea3ng ph\u1ea3i \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb. INNER JOIN gi\u00fap t\u00ecm c\u00e1c b\u1ea3n ghi c\u00f3 li\u00ean k\u1ebft trong c\u00e1c b\u1ea3ng kh\u00e1c nhau v\u00e0 k\u1ebft h\u1ee3p ch\u00fang l\u1ea1i th\u00e0nh m\u1ed9t b\u1ea3n ch\u1ec9nh s\u1eeda d\u1eef li\u1ec7u.<\/p>\n<p>M\u1eb7t kh\u00e1c, LEFT JOIN kh\u00f4ng lo\u1ea1i b\u1ecf b\u1ea5t k\u1ef3 b\u1ea3n ghi n\u00e0o t\u1eeb b\u1ea3ng tr\u00e1i. N\u00f3 tr\u1ea3 v\u1ec1 t\u1ea5t c\u1ea3 c\u00e1c b\u1ea3n ghi t\u1eeb b\u1ea3ng tr\u00e1i, kh\u00f4ng k\u1ec3 c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi b\u1ea3ng ph\u1ea3i hay kh\u00f4ng. N\u1ebfu ph\u1ea3i kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb tr\u00f9ng kh\u1edbp trong b\u1ea3ng th\u00ec c\u00e1c c\u1ed9t trong b\u1ea3ng ph\u1ea3i c\u00f3 gi\u00e1 tr\u1ecb NULL trong k\u1ebft qu\u1ea3 \u0111\u1ea7u ra. LEFT JOIN cho ph\u00e9p l\u1ea5y t\u1ea5t c\u1ea3 c\u00e1c b\u1ea3n ghi t\u1eeb b\u1ea3ng tr\u00e1i v\u00e0 k\u1ebft h\u1ee3p ch\u00fang v\u1edbi c\u00e1c b\u1ea3n ghi ph\u00f9 h\u1ee3p t\u1eeb b\u1ea3ng ph\u1ea3i.<\/p>\n<h3>So s\u00e1nh INNER JOIN v\u1edbi RIGHT JOIN<\/h3>\n<p>INNER JOIN v\u00e0 RIGHT JOIN l\u00e0 hai lo\u1ea1i JOIN kh\u00e1c nhau v\u1ec1 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng v\u00e0 k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1. C\u00e2u l\u1ec7nh n\u00e0y ch\u1ec9 tr\u1ea3 v\u1ec1 c\u00e1c b\u1ea3n ghi c\u00f3 gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p trong c\u1ea3 hai b\u1ea3ng. Ch\u1ec9 nh\u1eefng b\u1ea3n ghi c\u00f3 gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p trong c\u1ea3 b\u1ea3ng tr\u00e1i v\u00e0 b\u1ea3ng ph\u1ea3i \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb. B\u1ea3n ghi kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p s\u1ebd b\u1ecb lo\u1ea1i b\u1ecf.<\/p>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/join\/\" rel=\"attachment wp-att-299505\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-7.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-7-300x200.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-7-768x512.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-299505 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-7.jpg\" alt=\"inner-join-trong-sql-7\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-7.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-7-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-7-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/a><\/p>\n<p>RIGHT JOIN th\u00ec kh\u00f4ng lo\u1ea1i b\u1ecf b\u1ea5t k\u1ef3 b\u1ea3n ghi n\u00e0o t\u1eeb b\u1ea3ng ph\u1ea3i. N\u00f3 tr\u1ea3 v\u1ec1 t\u1ea5t c\u1ea3 c\u00e1c b\u1ea3n ghi t\u1eeb b\u1ea3ng ph\u1ea3i \u0111\u01b0\u1ee3c lo\u1ea1i tr\u1eeb c\u00f3 kh\u1edbp v\u1edbi b\u1ea3ng tr\u00e1i hay kh\u00f4ng. N\u1ebfu kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb tr\u00f9ng kh\u1edbp trong b\u1ea3ng tr\u00e1i, c\u00e1c c\u1ed9t t\u1eeb b\u1ea3ng tr\u00e1i s\u1ebd c\u00f3 gi\u00e1 tr\u1ecb NULL trong k\u1ebft qu\u1ea3 \u0111\u1ea7u ra. C\u00e2u l\u1ec7nh n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong tr\u01b0\u1eddng h\u1ee3p ng\u01b0\u1eddi d\u00f9ng mu\u1ed1n l\u1ea5y t\u1ea5t c\u1ea3 c\u00e1c b\u1ea3n ghi t\u1eeb b\u1ea3ng ph\u1ea3i v\u00e0 k\u1ebft h\u1ee3p ch\u00fang v\u1edbi c\u00e1c b\u1ea3n ghi ph\u00f9 h\u1ee3p t\u1eeb b\u1ea3ng b\u00ean tr\u00e1i. \u0110i\u1ec1u n\u00e0y h\u1eefu \u00edch khi mu\u1ed1n gi\u1eef l\u1ea1i t\u1ea5t c\u1ea3 th\u00f4ng tin t\u1eeb b\u1ea3ng ph\u1ea3i, ngay c\u1ea3 khi kh\u00f4ng c\u00f3 k\u1ebft qu\u1ea3 kh\u1edbp trong b\u1ea3ng b\u00ean tr\u00e1i.<\/p>\n<h3>So s\u00e1nh INNER JOIN v\u1edbi FULL JOIN<\/h3>\n<p>INNER JOIN v\u00e0 FULL JOIN l\u00e0 hai lo\u1ea1i JOIN kh\u00e1c nhau v\u1ec1 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng v\u00e0 k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1. INNER JOIN ch\u1ec9 tr\u1ea3 v\u1ec1 c\u00e1c b\u1ea3n ghi c\u00f3 gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p trong c\u1ea3 hai b\u1ea3ng. Ch\u1ec9 nh\u1eefng b\u1ea3n ghi c\u00f3 gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p trong c\u1ea3 b\u1ea3ng tr\u00e1i v\u00e0 b\u1ea3ng ph\u1ea3i \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb trong k\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng. B\u1ea3n ghi kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p s\u1ebd b\u1ecb lo\u1ea1i b\u1ecf.<\/p>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/join-2\/\" rel=\"attachment wp-att-299506\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-8.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-8-300x200.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-8-768x512.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-299506 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-8.jpg\" alt=\"inner-join-trong-sql-8\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-8.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-8-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-8-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/a><\/p>\n<p>Ng\u01b0\u1ee3c l\u1ea1i, FULL JOIN \u0111\u01b0\u1ee3c tr\u1ea3 v\u1ec1 t\u1ea5t c\u1ea3 c\u00e1c b\u1ea3n ghi t\u1eeb c\u1ea3 hai b\u1ea3ng, bao g\u1ed3m c\u1ea3 b\u1ea3n ghi tr\u00f9ng kh\u1edbp v\u00e0 kh\u00f4ng kh\u1edbp. N\u1ebfu kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb tr\u00f9ng kh\u1edbp trong m\u1ed9t b\u1ea3ng th\u00ec c\u00e1c c\u1ed9t t\u1eeb b\u1ea3ng \u0111\u00f3 s\u1ebd c\u00f3 gi\u00e1 tr\u1ecb NULL trong k\u1ebft qu\u1ea3 \u0111\u1ea7u ra. FULL JOIN \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng khi ng\u01b0\u1eddi d\u00f9ng mu\u1ed1n l\u1ea5y t\u1ea5t c\u1ea3 c\u00e1c b\u1ea3n ghi t\u1eeb c\u1ea3 hai b\u1ea3ng, b\u1ea5t k\u1ec3 c\u00f3 tr\u00f9ng kh\u1edbp hay kh\u00f4ng. \u0110\u00e2y l\u00e0 c\u00e2u l\u1ec7nh h\u1eefu d\u1ee5ng khi mu\u1ed1n hi\u1ec3n th\u1ecb t\u1ea5t c\u1ea3 th\u00f4ng tin t\u1eeb c\u1ea3 hai b\u1ea3ng v\u00e0 x\u00e1c \u0111\u1ecbnh c\u00e1c b\u1ea3n ghi kh\u00f4ng kh\u1edbp.<\/p>\n<h2>M\u1ed9t s\u1ed1 c\u00e2u l\u1ec7nh c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p l\u1ec7nh INNER JOIN<\/h2>\n<p>INNER JOIN trong SQL l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd cho ph\u00e9p k\u1ebft h\u1ee3p th\u00f4ng tin t\u1eeb nhi\u1ec1u b\u1ea3ng d\u1ef1a tr\u00ean m\u1ed9t k\u1ebft n\u1ed1i \u0111i\u1ec1u ki\u1ec7n. Khi s\u1eed d\u1ee5ng c\u00e2u l\u1ec7nh n\u00e0y, ta c\u00f3 th\u1ec3 truy xu\u1ea5t d\u1eef li\u1ec7u t\u1eeb c\u00e1c b\u1ea3ng li\u00ean k\u1ebft v\u00e0 l\u1ea5y k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c m\u00e0 ta c\u1ea7n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 bi\u1ebfn ph\u1ed5 c\u00e2u l\u1ec7nh c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p v\u1edbi INNER JOIN \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c truy v\u1ea5n ph\u1ee9c h\u1ee3p:<\/p>\n<h3>L\u1ec7nh WHERE<\/h3>\n<p>L\u1ec7nh WHERE trong SQL \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u00e1p d\u1ee5ng d\u1eef li\u1ec7u l\u1ecdc \u0111i\u1ec1u ki\u1ec7n trong l\u1ec7nh CH\u1eccN, C\u1eacP NH\u1eacT ho\u1eb7c X\u00d3A. L\u1ec7nh WHERE cho ph\u00e9p ta ch\u1ec9 \u0111\u1ecbnh m\u1ed9t ho\u1eb7c nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n m\u00e0 h\u00e0ng h\u00f3a ph\u1ea3i th\u1ecfa m\u00e3n \u0111\u1ec3 \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn, c\u1eadp nh\u1eadt ho\u1eb7c x\u00f3a.<\/p>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/inner-join-trong-sql-9\/\" rel=\"attachment wp-att-299507\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-9.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-9-300x200.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-9-768x512.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-299507 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-9.jpg\" alt=\"inner-join-trong-sql-9\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-9.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-9-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-9-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/a><\/p>\n<p>Khi INNER JOIN h\u1ee3p nh\u1ea5t v\u1edbi l\u1ec7nh WHERE, ch\u00fang ta c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng c\u00e1c \u0111i\u1ec1u ki\u1ec7n b\u1ed5 sung \u0111\u1ec3 l\u1ecdc k\u1ebft qu\u1ea3 c\u1ee7a l\u1ec7nh INNER JOIN. L\u1ec7nh WHERE cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng ch\u1ec9 \u0111\u1ecbnh m\u1ed9t \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 ch\u1ecdn c\u00e1c h\u00e0ng t\u1eeb c\u00e1c b\u1ea3ng \u0111\u00e3 \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p.<\/p>\n<h3>L\u1ec7nh GROUP BY<\/h3>\n<p>GROUP BY l\u00e0 m\u1ed9t c\u00e2u l\u1ec7nh m\u1ea1nh m\u1ebd trong c\u01a1 s\u1edf d\u1eef li\u1ec7u truy v\u1ea5n ng\u00f4n ng\u1eef, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 nh\u00f3m c\u00e1c b\u1ea3n ghi d\u1ef1a tr\u00ean m\u1ed9t ho\u1eb7c nhi\u1ec1u c\u1ed9t. Khi h\u1ee3p nh\u1ea5t v\u1edbi l\u1ec7nh INNER JOIN trong SQL, l\u1ec7nh GROUP BY c\u00f3 th\u1ec3 mang l\u1ea1i c\u00e1c ph\u00e2n nh\u00f3m h\u1eefu \u00edch sau khi \u0111\u00e3 k\u1ebft n\u1ed1i hai b\u1ea3ng.<\/p>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/inner-join-trong-sql-10\/\" rel=\"attachment wp-att-299508\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-10.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-10-300x200.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-10-768x512.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-299508 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-10.jpg\" alt=\"inner-join-trong-sql-10\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-10.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-10-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-10-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/a><\/p>\n<p>Khi s\u1eed d\u1ee5ng l\u1ec7nh GROUP BY, ch\u00fang ta ph\u1ea3i ch\u1ec9 \u0111\u1ecbnh c\u00e1c c\u1ed9t ho\u1eb7c c\u00e1c c\u1ed9t m\u00e0 ch\u00fang ta mu\u1ed1n nh\u00f3m d\u1eef li\u1ec7u theo. C\u00e1c b\u1ea3n ghi c\u00f3 gi\u00e1 tr\u1ecb gi\u1ed1ng nhau trong c\u00e1c c\u1ed9t \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh s\u1ebd \u0111\u01b0\u1ee3c nh\u00f3m l\u1ea1i th\u00e0nh m\u1ed9t nh\u00f3m duy nh\u1ea5t. Sau \u0111\u00f3, h\u1ecd c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng c\u00e1c h\u00e0m t\u1ed5ng h\u1ee3p nh\u01b0 COUNT, SUM, AVG, MAX, MIN v\u00e0 nhi\u1ec1u h\u00e0m kh\u00e1c \u0111\u1ec3 t\u00ednh to\u00e1n c\u00e1c th\u1ed1ng k\u00ea gi\u00e1 tr\u1ecb tr\u00ean c\u00e1c d\u1eef li\u1ec7u nh\u00f3m n\u00e0y.<\/p>\n<h3>L\u1ec7nh ORDER BY<\/h3>\n<p>L\u1ec7nh ORDER BY l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong c\u01a1 s\u1edf d\u1eef li\u1ec7u truy v\u1ea5n ng\u00f4n ng\u1eef, cho ph\u00e9p ch\u00fang s\u1eafp x\u1ebfp c\u00e1c b\u1ea3n ghi theo m\u1ed9t ho\u1eb7c nhi\u1ec1u c\u1ed9t. Khi k\u1ebft h\u1ee3p v\u1edbi INNER JOIN l\u1ec7nh, c\u00e2u l\u1ec7nh n\u00e0y cung c\u1ea5p kh\u1ea3 n\u0103ng s\u1eafp x\u1ebfp c\u00e1c b\u1ea3n ghi sau khi hai b\u1ea3ng \u0111\u00e3 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i.<\/p>\n<p><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/inner-join-trong-sql-11\/\" rel=\"attachment wp-att-299509\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-11.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-11-300x200.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/inner-join-trong-sql-11-768x512.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-299509 webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-11.jpg\" alt=\"inner-join-trong-sql-11\" width=\"800\" height=\"533\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-11.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-11-300x200.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/inner-join-trong-sql-11-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/a><\/p>\n<p>Trong c\u01a1 s\u1edf d\u1eef li\u1ec7u, th\u00f4ng tin th\u01b0\u1eddng \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef theo c\u1ea5u tr\u00fac ho\u1eb7c kh\u00f4ng c\u00f3 tr\u00ecnh t\u1ef1 \u0111\u1ecbnh ngh\u0129a nh\u1ea5t. Khi mu\u1ed1n hi\u1ec3n th\u1ecb d\u1eef li\u1ec7u theo th\u1ee9 t\u1ef1 t\u1ed1i thi\u1ec3u, l\u1ec7nh ORDER BY s\u1ebd tr\u1edf n\u00ean c\u1ea7n thi\u1ebft. Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 ch\u1ec9 \u0111\u1ecbnh c\u00e1c c\u1ed9t ho\u1eb7c c\u00e1c c\u1ed9t m\u00e0 ch\u00fang ta mu\u1ed1n s\u1eafp x\u1ebfp d\u1eef li\u1ec7u. Khi truy v\u1ea5n \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n, d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 t\u0103ng d\u1ea7n ho\u1eb7c gi\u1ea3m d\u1ea7n c\u1ee7a c\u00e1c c\u1ed9t \u0111\u00e3 ch\u1ecdn.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p><strong>INNER JOIN trong SQL<\/strong> l\u00e0 m\u1ed9t k\u1ebft n\u1ed1i quan tr\u1ecdng cho ph\u00e9p k\u1ebft h\u1ee3p th\u00f4ng tin t\u1eeb nhi\u1ec1u b\u1ea3ng kh\u00e1c nhau d\u1ef1a tr\u00ean m\u1ed9t k\u1ebft h\u1ee3p \u0111i\u1ec1u ki\u1ec7n. Vi\u1ec7c s\u1eed d\u1ee5ng INNER JOIN c\u1ea7n \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n c\u1ea9n th\u1eadn v\u00e0 x\u00e1c \u0111\u1ecbnh \u0111i\u1ec1u ki\u1ec7n h\u1ee3p l\u00fd \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh ch\u00ednh x\u00e1c v\u00e0 hi\u1ec7u qu\u1ea3 c\u1ee7a truy v\u1ea5n d\u1eef li\u1ec7u. Tuy nhi\u00ean, ng\u01b0\u1eddi d\u00f9ng c\u1ea7n c\u1ea9n th\u1eadn \u0111\u1ec3 tr\u00e1nh t\u00ecnh tr\u1ea1ng tr\u1ea3 k\u1ebft qu\u1ea3 qu\u00e1 l\u1edbn ho\u1eb7c truy v\u1ea5n kh\u00f4ng hi\u1ec7u qu\u1ea3. \u0110\u1ed3ng th\u1eddi, vi\u1ec7c x\u00e1c \u0111\u1ecbnh m\u1ed9t \u0111i\u1ec1u ki\u1ec7n ph\u00f9 h\u1ee3p l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh ch\u00ednh x\u00e1c v\u00e0 \u0111\u00fang \u0111\u1eafn c\u1ee7a k\u1ebft qu\u1ea3 INNER JOIN.<\/p>\n<p>Xem th\u00eam:<\/p>\n<p class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/kieu-go-telex\/\">Ki\u1ec3u g\u00f5 Telex, c\u00e1ch g\u00f5 Telex v\u00e0 b\u1ea3ng m\u00e3 ti\u1ebfng Vi\u1ec7t Telex<\/a><\/p>\n<p class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/reg-la-gi\/\">T\u1ec7p REG l\u00e0 g\u00ec trong Windows? C\u00e1ch m\u1edf v\u00e0 \u0111\u1ecdc n\u1ed9i dung t\u1ec7p REG<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 truy v\u1ea5n SQL, INNER JOIN l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m quan tr\u1ecdng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 k\u1ebft h\u1ee3p d\u1eef li\u1ec7u t\u1eeb nhi\u1ec1u b\u1ea3ng kh\u00e1c nhau. V\u1edbi INNER JOIN trong SQL, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c truy v\u1ea5n ph\u1ee9c t\u1ea1p v\u00e0 m\u1ea1nh m\u1ebd, cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng t\u00ecm hi\u1ec3u [&hellip;]<\/p>\n","protected":false},"author":86,"featured_media":299510,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,412],"tags":[],"class_list":["post-299498","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thu-thuat","category-thu-thuat-may-tinh"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.2 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>INNER JOIN trong SQL, t\u00ecm hi\u1ec3u chi ti\u1ebft<\/title>\n<meta name=\"description\" content=\"INNER JOIN trong SQL l\u00e0 g\u00ec? H\u1ecdc c\u00e1ch k\u1ebft h\u1ee3p d\u1eef li\u1ec7u t\u1eeb hai b\u1ea3ng hi\u1ec7u qu\u1ea3. H\u1ecdc ngay \u0111\u1ec3 n\u1eafm b\u1eaft c\u00fa ph\u00e1p v\u00e0 c\u00e1ch k\u1ebft h\u1ee3p v\u1edbi c\u00e2u l\u1ec7nh kh\u00e1c.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hoanghamobile.com\/tin-tuc\/inner-join-trong-sql\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"INNER JOIN trong SQL\" \/>\n<meta property=\"og:description\" content=\"INNER JOIN trong SQL l\u00e0 g\u00ec? H\u1ecdc c\u00e1ch k\u1ebft h\u1ee3p d\u1eef li\u1ec7u t\u1eeb hai b\u1ea3ng hi\u1ec7u qu\u1ea3. 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