{"id":196830,"date":"2024-11-14T02:52:20","date_gmt":"2024-11-13T18:52:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/196830\/"},"modified":"2024-11-14T02:52:21","modified_gmt":"2024-11-13T18:52:21","slug":"%e9%80%90%e6%a2%9d%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%e7%9a%84sql%e8%aa%9e%e5%8f%a5%e5%af%ab%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/196830\/","title":{"rendered":"\u9010\u689d\u66f4\u65b0\u6578\u64da\u7684SQL\u8a9e\u53e5\u5beb\u6cd5"},"content":{"rendered":"<h1 id=\"%e9%80%90%e6%a2%9d%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%e7%9a%84sql%e8%aa%9e%e5%8f%a5%e5%af%ab%e6%b3%95-muiqMAXrCr\">\u9010\u689d\u66f4\u65b0\u6578\u64da\u7684SQL\u8a9e\u53e5\u5beb\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u66f4\u65b0\u6578\u64da\u662f\u4e00\u9805\u5e38\u898b\u7684\u64cd\u4f5c\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u66f4\u65b0\u6578\u64da\uff0c\u5176\u4e2d\u9010\u689d\u66f4\u65b0\u6578\u64da\u7684\u65b9\u5f0f\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528SQL\u8a9e\u53e5\u9010\u689d\u66f4\u65b0\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u7bc4\u4f8b\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%80%90%e6%a2%9d%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%ef%bc%9f-muiqMAXrCr\">\u4ec0\u9ebc\u662f\u9010\u689d\u66f4\u65b0\u6578\u64da\uff1f<\/h2>\n<p>\u9010\u689d\u66f4\u65b0\u6578\u64da\u662f\u6307\u5c0d\u6578\u64da\u5eab\u4e2d\u7684\u6bcf\u4e00\u689d\u8a18\u9304\u9032\u884c\u55ae\u7368\u7684\u66f4\u65b0\u64cd\u4f5c\u3002\u9019\u7a2e\u65b9\u6cd5\u901a\u5e38\u7528\u65bc\u9700\u8981\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u6216\u908f\u8f2f\u4f86\u66f4\u65b0\u6578\u64da\u7684\u60c5\u6cc1\u3002\u8207\u6279\u91cf\u66f4\u65b0\u76f8\u6bd4\uff0c\u9010\u689d\u66f4\u65b0\u53ef\u4ee5\u63d0\u4f9b\u66f4\u9ad8\u7684\u9748\u6d3b\u6027\uff0c\u4f46\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e7%9a%84sql%e6%9b%b4%e6%96%b0%e8%aa%9e%e5%8f%a5-muiqMAXrCr\">\u57fa\u672c\u7684SQL\u66f4\u65b0\u8a9e\u53e5<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u66f4\u65b0\u6578\u64da\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>UPDATE \u8868\u540d\nSET \u5217\u540d1 = \u503c1, \u5217\u540d2 = \u503c2, ...\nWHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u9019\u88e1\u7684<strong>\u8868\u540d<\/strong>\u662f\u8981\u66f4\u65b0\u7684\u6578\u64da\u8868\uff0c<strong>\u5217\u540d<\/strong>\u662f\u9700\u8981\u66f4\u65b0\u7684\u5217\uff0c<strong>\u503c<\/strong>\u662f\u65b0\u7684\u6578\u64da\uff0c\u800c<strong>\u689d\u4ef6<\/strong>\u5247\u7528\u65bc\u6307\u5b9a\u54ea\u4e9b\u8a18\u9304\u9700\u8981\u88ab\u66f4\u65b0\u3002<\/p>\n<h2 id=\"%e9%80%90%e6%a2%9d%e6%9b%b4%e6%96%b0%e7%9a%84%e7%af%84%e4%be%8b-muiqMAXrCr\">\u9010\u689d\u66f4\u65b0\u7684\u7bc4\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\uff0c\u5305\u542b\u54e1\u5de5\u7684\u59d3\u540d\u548c\u85aa\u6c34\u3002\u6211\u5011\u5e0c\u671b\u6839\u64da\u54e1\u5de5\u7684ID\u9010\u689d\u66f4\u65b0\u4ed6\u5011\u7684\u85aa\u6c34\u3002\u4ee5\u4e0b\u662f\u9010\u689d\u66f4\u65b0\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>UPDATE employees\nSET salary = 5000\nWHERE employee_id = 1;\n\nUPDATE employees\nSET salary = 6000\nWHERE employee_id = 2;\n\nUPDATE employees\nSET salary = 7000\nWHERE employee_id = 3;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5c0d\u6bcf\u4e00\u4f4d\u54e1\u5de5\u7684\u85aa\u6c34\u9032\u884c\u4e86\u55ae\u7368\u7684\u66f4\u65b0\u3002\u9019\u7a2e\u65b9\u6cd5\u96d6\u7136\u7c21\u55ae\uff0c\u4f46\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u6703\u986f\u5f97\u7e41\u7463\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e6%b8%b8%e6%a8%99%e9%80%b2%e8%a1%8c%e9%80%90%e6%a2%9d%e6%9b%b4%e6%96%b0-muiqMAXrCr\">\u4f7f\u7528\u6e38\u6a19\u9032\u884c\u9010\u689d\u66f4\u65b0<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u6e38\u6a19\uff08Cursor\uff09\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u9010\u689d\u66f4\u65b0\u6578\u64da\u3002\u6e38\u6a19\u5141\u8a31\u6211\u5011\u9010\u884c\u8655\u7406\u67e5\u8a62\u7d50\u679c\uff0c\u4e26\u5c0d\u6bcf\u4e00\u884c\u9032\u884c\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u6e38\u6a19\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DECLARE @employee_id INT, @new_salary DECIMAL(10, 2);\n\nDECLARE employee_cursor CURSOR FOR\nSELECT employee_id, salary * 1.1 FROM employees; -- \u5047\u8a2d\u6211\u5011\u8981\u5c07\u85aa\u6c34\u63d0\u9ad810%\n\nOPEN employee_cursor;\n\nFETCH NEXT FROM employee_cursor INTO @employee_id, @new_salary;\n\nWHILE @@FETCH_STATUS = 0\nBEGIN\n    UPDATE employees\n    SET salary = @new_salary\n    WHERE employee_id = @employee_id;\n\n    FETCH NEXT FROM employee_cursor INTO @employee_id, @new_salary;\nEND\n\nCLOSE employee_cursor;\nDEALLOCATE employee_cursor;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5b9a\u7fa9\u4e86\u4e00\u500b\u6e38\u6a19\uff0c\u7136\u5f8c\u9010\u884c\u63d0\u53d6\u54e1\u5de5ID\u548c\u65b0\u7684\u85aa\u6c34\uff0c\u4e26\u5c0d\u6bcf\u4e00\u4f4d\u54e1\u5de5\u9032\u884c\u66f4\u65b0\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u9700\u8981\u6839\u64da\u8907\u96dc\u908f\u8f2f\u9032\u884c\u66f4\u65b0\u6642\u7279\u5225\u6709\u7528\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-muiqMAXrCr\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u9010\u689d\u66f4\u65b0\uff1a<\/strong>\u5982\u679c\u53ef\u4ee5\u4f7f\u7528\u6279\u91cf\u66f4\u65b0\uff0c\u5247\u61c9\u512a\u5148\u8003\u616e\u6279\u91cf\u66f4\u65b0\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u4f7f\u7528\u4e8b\u52d9\uff1a<\/strong>\u5728\u9032\u884c\u591a\u689d\u66f4\u65b0\u6642\uff0c\u4f7f\u7528\u4e8b\u52d9\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002<\/li>\n<li><strong>\u6e2c\u8a66\u66f4\u65b0\u8a9e\u53e5\uff1a<\/strong>\u5728\u751f\u7522\u74b0\u5883\u4e2d\u57f7\u884c\u66f4\u65b0\u8a9e\u53e5\u4e4b\u524d\uff0c\u61c9\u5728\u6e2c\u8a66\u74b0\u5883\u4e2d\u9032\u884c\u5145\u5206\u6e2c\u8a66\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-muiqMAXrCr\">\u7e3d\u7d50<\/h2>\n<p>\u9010\u689d\u66f4\u65b0\u6578\u64da\u7684SQL\u8a9e\u53e5\u5beb\u6cd5\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\u3002\u7121\u8ad6\u662f\u4f7f\u7528\u57fa\u672c\u7684\u66f4\u65b0\u8a9e\u53e5\u9084\u662f\u5229\u7528\u6e38\u6a19\u9032\u884c\u9010\u884c\u8655\u7406\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u66f4\u65b0\u6578\u64da\u5c0d\u65bc\u7dad\u8b77\u6578\u64da\u5eab\u7684\u5b8c\u6574\u6027\u548c\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u7ba1\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u9010\u689d\u66f4\u65b0\u6578\u64da\u7684SQL\u8a9e\u53e5\u5beb\u6cd5\uff0c\u638c\u63e1\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u5eab\u64cd\u4f5c\u80fd\u529b\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-196830","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196830","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=196830"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196830\/revisions"}],"predecessor-version":[{"id":196831,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196830\/revisions\/196831"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=196830"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=196830"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=196830"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}