{"id":139588,"date":"2024-10-31T18:48:31","date_gmt":"2024-10-31T10:48:31","guid":{"rendered":"https:\/\/server.hk\/cnblog\/139588\/"},"modified":"2024-10-31T18:48:32","modified_gmt":"2024-10-31T10:48:32","slug":"sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e5%85%a7%e5%ae%b9%e6%9b%bf%e6%8f%9b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/139588\/","title":{"rendered":"SQL Server\u6578\u64da\u5eab\u5167\u5bb9\u66ff\u63db\u65b9\u6cd5"},"content":{"rendered":"

SQL Server\u6578\u64da\u5eab\u5167\u5bb9\u66ff\u63db\u65b9\u6cd5<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u66ff\u63db\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u56e0\u70ba\u6578\u64da\u932f\u8aa4\u3001\u66f4\u65b0\u9700\u6c42\uff0c\u9084\u662f\u6578\u64da\u6e05\u7406\uff0cSQL Server\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u6578\u64da\u7684\u66ff\u63db\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u5e38\u7528\u7684SQL Server\u6578\u64da\u5eab\u5167\u5bb9\u66ff\u63db\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n

1. \u4f7f\u7528UPDATE\u8a9e\u53e5<\/h2>\n

\u6700\u76f4\u63a5\u7684\u65b9\u5f0f\u662f\u4f7f\u7528UPDATE<\/code>\u8a9e\u53e5\u4f86\u66ff\u63db\u7279\u5b9a\u884c\u7684\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u9069\u5408\u65bc\u9700\u8981\u66f4\u65b0\u7279\u5b9a\u689d\u4ef6\u4e0b\u7684\u6578\u64da\u3002<\/p>\n

UPDATE \u8868\u540d\nSET \u5217\u540d = '\u65b0\u503c'\nWHERE \u689d\u4ef6;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70baCustomers<\/code>\u7684\u8868\uff0c\u4e26\u5e0c\u671b\u5c07\u5ba2\u6236ID\u70ba1\u7684\u5ba2\u6236\u540d\u7a31\u66f4\u65b0\u70ba\u201c\u65b0\u540d\u7a31\u201d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n
UPDATE Customers\nSET Name = '\u65b0\u540d\u7a31'\nWHERE CustomerID = 1;<\/code><\/pre>\n
2. \u4f7f\u7528REPLACE\u51fd\u6578<\/h2>\n
\u5982\u679c\u9700\u8981\u5728\u67d0\u4e00\u5217\u4e2d\u66ff\u63db\u7279\u5b9a\u7684\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u4f7f\u7528REPLACE<\/code>\u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u5728\u6307\u5b9a\u7684\u5217\u4e2d\u67e5\u627e\u4e26\u66ff\u63db\u5b57\u7b26\u4e32\u3002<\/p>\n
UPDATE \u8868\u540d\nSET \u5217\u540d = REPLACE(\u5217\u540d, '\u820a\u503c', '\u65b0\u503c')\nWHERE \u689d\u4ef6;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u60f3\u8981\u5c07Products<\/code>\u8868\u4e2d\u6240\u6709\u7522\u54c1\u63cf\u8ff0\u4e2d\u7684\u201c\u820a\u7522\u54c1\u201d\u66ff\u63db\u70ba\u201c\u65b0\u7522\u54c1\u201d\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
UPDATE Products\nSET Description = REPLACE(Description, '\u820a\u7522\u54c1', '\u65b0\u7522\u54c1');<\/code><\/pre>\n
3. \u4f7f\u7528CASE\u8a9e\u53e5\u9032\u884c\u689d\u4ef6\u66ff\u63db<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u6839\u64da\u4e0d\u540c\u7684\u689d\u4ef6\u4f86\u66ff\u63db\u6578\u64da\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528CASE<\/code>\u8a9e\u53e5\u4f86\u5be6\u73fe\u3002<\/p>\n
UPDATE \u8868\u540d\nSET \u5217\u540d = CASE\n    WHEN \u689d\u4ef61 THEN '\u65b0\u503c1'\n    WHEN \u689d\u4ef62 THEN '\u65b0\u503c2'\n    ELSE \u5217\u540d\nEND\nWHERE \u689d\u4ef6;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u6839\u64da\u5ba2\u6236\u7684\u7b49\u7d1a\u4f86\u66f4\u65b0\u6298\u6263\u7387\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n
UPDATE Customers\nSET Discount = CASE\n    WHEN Level = '\u91d1' THEN 0.2\n    WHEN Level = '\u9280' THEN 0.1\n    ELSE 0\nEND;<\/code><\/pre>\n
4. \u4f7f\u7528MERGE\u8a9e\u53e5\u9032\u884c\u6279\u91cf\u66ff\u63db<\/h2>\n
\u5982\u679c\u9700\u8981\u6839\u64da\u53e6\u4e00\u500b\u8868\u7684\u6578\u64da\u4f86\u66f4\u65b0\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528MERGE<\/code>\u8a9e\u53e5\u3002\u9019\u7a2e\u65b9\u6cd5\u9069\u5408\u65bc\u6279\u91cf\u66f4\u65b0\u3002<\/p>\n
MERGE INTO \u76ee\u6a19\u8868 AS \u76ee\u6a19\nUSING \u6e90\u8868 AS \u6e90\nON \u76ee\u6a19.\u5339\u914d\u5217 = \u6e90.\u5339\u914d\u5217\nWHEN MATCHED THEN\n    UPDATE SET \u76ee\u6a19.\u5217\u540d = \u6e90.\u65b0\u503c\nWHEN NOT MATCHED THEN\n    INSERT (\u5217\u540d) VALUES (\u6e90.\u65b0\u503c);<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500bNewCustomers<\/code>\u8868\uff0c\u4e26\u5e0c\u671b\u5c07\u5176\u6578\u64da\u5408\u4f75\u5230Customers<\/code>\u8868\u4e2d\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
MERGE INTO Customers AS Target\nUSING NewCustomers AS Source\nON Target.CustomerID = Source.CustomerID\nWHEN MATCHED THEN\n    UPDATE SET Target.Name = Source.Name\nWHEN NOT MATCHED THEN\n    INSERT (CustomerID, Name) VALUES (Source.CustomerID, Source.Name);<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u5728SQL Server\u4e2d\uff0c\u6578\u64da\u7684\u66ff\u63db\u53ef\u4ee5\u901a\u904e\u591a\u7a2e\u65b9\u6cd5\u5be6\u73fe\uff0c\u5305\u62ec\u4f7f\u7528UPDATE<\/code>\u8a9e\u53e5\u3001REPLACE<\/code>\u51fd\u6578\u3001CASE<\/code>\u8a9e\u53e5\u4ee5\u53caMERGE<\/code>\u8a9e\u53e5\u3002\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u548c\u66f4\u65b0\u6578\u64da\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684VPS<\/code>\u89e3\u6c7a\u65b9\u6848\uff0c\u5982\u9999\u6e2fVPS<\/a>\uff0c\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u548c\u9748\u6d3b\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3SQL Server\u6578\u64da\u5eab\u5167\u5bb9\u66ff\u63db\u65b9\u6cd5\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u66f4\u65b0\u548c\u7ba1\u7406\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u6e96\u78ba\u6027\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-139588","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139588","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=139588"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139588\/revisions"}],"predecessor-version":[{"id":139589,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139588\/revisions\/139589"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=139588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=139588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=139588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}