{"id":139670,"date":"2024-10-31T19:40:20","date_gmt":"2024-10-31T11:40:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/139670\/"},"modified":"2024-10-31T19:40:21","modified_gmt":"2024-10-31T11:40:21","slug":"sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%a6%82%e4%bd%95%e5%90%88%e4%bd%b5%e8%a1%a8%e6%a0%bc%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/139670\/","title":{"rendered":"SQL Server\u6578\u64da\u5eab\u4e2d\u5982\u4f55\u5408\u4f75\u8868\u683c\u6578\u64da"},"content":{"rendered":"

SQL Server\u6578\u64da\u5eab\u4e2d\u5982\u4f55\u5408\u4f75\u8868\u683c\u6578\u64da<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5408\u4f75\u8868\u683c\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002SQL Server\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5408\u4f75\u8868\u683c\u6578\u64da\uff0c\u9019\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u6574\u5408\u548c\u7ba1\u7406\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u5e38\u7528\u7684\u5408\u4f75\u65b9\u6cd5\uff0c\u5305\u62ec\u4f7f\u7528JOIN\u3001UNION\u4ee5\u53caMERGE\u8a9e\u53e5\u3002<\/p>\n

\u4f7f\u7528JOIN\u5408\u4f75\u8868\u683c\u6578\u64da<\/h2>\n

JOIN\u662fSQL\u4e2d\u6700\u5e38\u7528\u7684\u5408\u4f75\u6578\u64da\u7684\u65b9\u6cd5\u4e4b\u4e00\u3002\u5b83\u5141\u8a31\u7528\u6236\u6839\u64da\u4e00\u500b\u6216\u591a\u500b\u5171\u540c\u7684\u5217\u4f86\u5408\u4f75\u5169\u500b\u6216\u591a\u500b\u8868\u683c\u3002\u6839\u64da\u9700\u8981\uff0cJOIN\u6709\u5e7e\u7a2e\u985e\u578b\uff0c\u5305\u62ecINNER JOIN\u3001LEFT JOIN\u3001RIGHT JOIN\u548cFULL OUTER JOIN\u3002<\/p>\n

INNER JOIN<\/h3>\n

INNER JOIN\u53ea\u8fd4\u56de\u5728\u5169\u500b\u8868\u4e2d\u90fd\u6709\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528INNER JOIN\u7684\u7bc4\u4f8b\uff1a<\/p>\n

SELECT a.*, b.*\nFROM TableA a\nINNER JOIN TableB b ON a.ID = b.A_ID;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u53ea\u6709\u7576TableA\u548cTableB\u4e2d\u90fd\u6709\u76f8\u540c\u7684ID\u6642\uff0c\u624d\u6703\u8fd4\u56de\u9019\u4e9b\u8a18\u9304\u3002<\/p>\n
LEFT JOIN<\/h3>\n
LEFT JOIN\u8fd4\u56de\u5de6\u5074\u8868\u683c\u7684\u6240\u6709\u8a18\u9304\uff0c\u5373\u4f7f\u53f3\u5074\u8868\u683c\u4e2d\u6c92\u6709\u5339\u914d\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662fLEFT JOIN\u7684\u7bc4\u4f8b\uff1a<\/p>\n
SELECT a.*, b.*\nFROM TableA a\nLEFT JOIN TableB b ON a.ID = b.A_ID;<\/code><\/pre>\n
\u9019\u6a23\uff0c\u5373\u4f7fTableB\u4e2d\u6c92\u6709\u8207TableA\u5339\u914d\u7684\u8a18\u9304\uff0cTableA\u7684\u6240\u6709\u8a18\u9304\u4ecd\u7136\u6703\u88ab\u8fd4\u56de\uff0c\u4e26\u4e14\u5c0d\u61c9\u7684TableB\u6b04\u4f4d\u5c07\u986f\u793a\u70baNULL\u3002<\/p>\n
\u4f7f\u7528UNION\u5408\u4f75\u8868\u683c\u6578\u64da<\/h2>\n
UNION\u7528\u65bc\u5408\u4f75\u5169\u500b\u6216\u591a\u500bSELECT\u67e5\u8a62\u7684\u7d50\u679c\u96c6\u3002\u4f7f\u7528UNION\u6642\uff0c\u6240\u6709\u67e5\u8a62\u5fc5\u9808\u5177\u6709\u76f8\u540c\u7684\u5217\u6578\u548c\u76f8\u4f3c\u7684\u6578\u64da\u985e\u578b\u3002\u4ee5\u4e0b\u662f\u4e00\u500bUNION\u7684\u7bc4\u4f8b\uff1a<\/p>\n
SELECT ID, Name FROM TableA\nUNION\nSELECT ID, Name FROM TableB;<\/code><\/pre>\n
\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56deTableA\u548cTableB\u4e2d\u6240\u6709\u4e0d\u540c\u7684ID\u548cName\u7d44\u5408\u3002\u5982\u679c\u9700\u8981\u5305\u62ec\u91cd\u8907\u7684\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528UNION ALL\u3002<\/p>\n
\u4f7f\u7528MERGE\u8a9e\u53e5\u5408\u4f75\u6578\u64da<\/h2>\n
MERGE\u8a9e\u53e5\u662f\u4e00\u7a2e\u66f4\u9ad8\u6548\u7684\u5408\u4f75\u6578\u64da\u7684\u65b9\u6cd5\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\u66f4\u65b0\u6216\u63d2\u5165\u6578\u64da\u6642\u3002MERGE\u8a9e\u53e5\u53ef\u4ee5\u540c\u6642\u57f7\u884cINSERT\u3001UPDATE\u548cDELETE\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u500bMERGE\u7684\u7bc4\u4f8b\uff1a<\/p>\n
MERGE INTO TargetTable AS target\nUSING SourceTable AS source\nON target.ID = source.ID\nWHEN MATCHED THEN\n    UPDATE SET target.Name = source.Name\nWHEN NOT MATCHED THEN\n    INSERT (ID, Name) VALUES (source.ID, source.Name);<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u7576ID\u5339\u914d\u6642\uff0c\u5c07\u66f4\u65b0TargetTable\u4e2d\u7684Name\uff1b\u5982\u679cID\u4e0d\u5339\u914d\uff0c\u5247\u5c07\u63d2\u5165\u65b0\u7684\u8a18\u9304\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u5408\u4f75\u8868\u683c\u6578\u64da\u662fSQL Server\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u7121\u8ad6\u662f\u4f7f\u7528JOIN\u3001UNION\u9084\u662fMERGE\u8a9e\u53e5\uff0c\u90fd\u80fd\u6709\u6548\u5730\u6574\u5408\u6578\u64da\u3002\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684SQL Server\u6578\u64da\u5eab\u9700\u6c42\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u4f01\u696d\u9084\u662f\u5927\u578b\u4f01\u696d\uff0c\u5408\u9069\u7684\u4e91\u670d\u52a1\u5668<\/a>\u90fd\u80fd\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u5728SQL Server\u6578\u64da\u5eab\u4e2d\u5408\u4f75\u8868\u683c\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u7c21\u5316\u67e5\u8a62\u548c\u5831\u544a\u904e\u7a0b\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-139670","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139670","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=139670"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139670\/revisions"}],"predecessor-version":[{"id":139671,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139670\/revisions\/139671"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=139670"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=139670"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=139670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}