{"id":191844,"date":"2024-11-12T17:18:25","date_gmt":"2024-11-12T09:18:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/191844\/"},"modified":"2024-11-12T17:18:27","modified_gmt":"2024-11-12T09:18:27","slug":"%e8%a9%b3%e8%a7%a3sql%e4%b8%ad%e5%be%aa%e7%92%b0%e7%b5%90%e6%a7%8b%e7%9a%84%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/191844\/","title":{"rendered":"\u8a73\u89e3SQL\u4e2d\u5faa\u74b0\u7d50\u69cb\u7684\u4f7f\u7528"},"content":{"rendered":"<h1 id=\"%e8%a9%b3%e8%a7%a3sql%e4%b8%ad%e5%be%aa%e7%92%b0%e7%b5%90%e6%a7%8b%e7%9a%84%e4%bd%bf%e7%94%a8-RybwavzafR\">\u8a73\u89e3SQL\u4e2d\u5faa\u74b0\u7d50\u69cb\u7684\u4f7f\u7528<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u67e5\u8a62\u548c\u64cd\u4f5c\u8cc7\u6599\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u7576\u6211\u5011\u9700\u8981\u5c0d\u8cc7\u6599\u9032\u884c\u91cd\u8907\u6027\u64cd\u4f5c\u6642\uff0c\u5faa\u74b0\u7d50\u69cb\u4fbf\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u5de5\u5177\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eSQL\u4e2d\u5faa\u74b0\u7d50\u69cb\u7684\u4f7f\u7528\uff0c\u5305\u62ec\u5176\u57fa\u672c\u6982\u5ff5\u3001\u5e38\u898b\u985e\u578b\u53ca\u5be6\u969b\u61c9\u7528\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e5%be%aa%e7%92%b0%e7%b5%90%e6%a7%8b%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-RybwavzafR\">\u5faa\u74b0\u7d50\u69cb\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5faa\u74b0\u7d50\u69cb\u5141\u8a31\u6211\u5011\u91cd\u8907\u57f7\u884c\u4e00\u6bb5\u7a0b\u5f0f\u78bc\uff0c\u76f4\u5230\u6eff\u8db3\u7279\u5b9a\u689d\u4ef6\u70ba\u6b62\u3002\u5728SQL\u4e2d\uff0c\u5faa\u74b0\u7d50\u69cb\u901a\u5e38\u7528\u65bc\u5b58\u5132\u904e\u7a0b\uff08Stored Procedures\uff09\u4e2d\uff0c\u4ee5\u4fbf\u5c0d\u8cc7\u6599\u9032\u884c\u6279\u91cf\u8655\u7406\u6216\u91cd\u8907\u67e5\u8a62\u3002\u9019\u4e9b\u7d50\u69cb\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\uff0c\u6e1b\u5c11\u91cd\u8907\u4ee3\u78bc\uff0c\u4e26\u4f7f\u7a0b\u5f0f\u78bc\u66f4\u5177\u53ef\u8b80\u6027\u3002<\/p>\n<h2 id=\"sql%e4%b8%ad%e7%9a%84%e5%be%aa%e7%92%b0%e7%b5%90%e6%a7%8b%e9%a1%9e%e5%9e%8b-RybwavzafR\">SQL\u4e2d\u7684\u5faa\u74b0\u7d50\u69cb\u985e\u578b<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u7a2e\u5faa\u74b0\u7d50\u69cb\uff1a<\/p>\n<ul>\n<li><strong>WHILE\u5faa\u74b0<\/strong><\/li>\n<li><strong>REPEAT&#8230;UNTIL\u5faa\u74b0<\/strong><\/li>\n<li><strong>FOR\u5faa\u74b0<\/strong><\/li>\n<\/ul>\n<h3 id=\"1-while%e5%be%aa%e7%92%b0-RybwavzafR\">1. WHILE\u5faa\u74b0<\/h3>\n<p>WHILE\u5faa\u74b0\u6703\u5728\u689d\u4ef6\u70ba\u771f\u6642\u91cd\u8907\u57f7\u884c\u4e00\u6bb5\u7a0b\u5f0f\u78bc\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528WHILE\u5faa\u74b0\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DECLARE @counter INT = 1;\nWHILE @counter &lt;= 5\nBEGIN\n    PRINT 'Counter value: ' + CAST(@counter AS VARCHAR);\n    SET @counter = @counter + 1;\nEND<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u7576\u8a08\u6578\u5668\u5c0f\u65bc\u6216\u7b49\u65bc5\u6642\uff0c\u5c07\u6301\u7e8c\u6253\u5370\u8a08\u6578\u5668\u7684\u503c\uff0c\u4e26\u5728\u6bcf\u6b21\u8ff4\u5708\u5f8c\u5c07\u8a08\u6578\u5668\u52a01\u3002<\/p>\n<h3 id=\"2-repeat-until%e5%be%aa%e7%92%b0-RybwavzafR\">2. REPEAT&#8230;UNTIL\u5faa\u74b0<\/h3>\n<p>REPEAT&#8230;UNTIL\u5faa\u74b0\u6703\u5728\u689d\u4ef6\u70ba\u5047\u6642\u91cd\u8907\u57f7\u884c\u4e00\u6bb5\u7a0b\u5f0f\u78bc\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528REPEAT&#8230;UNTIL\u5faa\u74b0\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DECLARE @counter INT = 1;\nREPEAT\n    PRINT 'Counter value: ' + CAST(@counter AS VARCHAR);\n    SET @counter = @counter + 1;\nUNTIL @counter &gt; 5\nEND REPEAT;<\/code><\/pre>\n<p>\u9019\u6bb5\u7a0b\u5f0f\u78bc\u5c07\u5728\u8a08\u6578\u5668\u5927\u65bc5\u4e4b\u524d\u6301\u7e8c\u6253\u5370\u8a08\u6578\u5668\u7684\u503c\u3002<\/p>\n<h3 id=\"3-for%e5%be%aa%e7%92%b0-RybwavzafR\">3. FOR\u5faa\u74b0<\/h3>\n<p>FOR\u5faa\u74b0\u901a\u5e38\u7528\u65bc\u904d\u6b77\u4e00\u500b\u7bc4\u570d\u6216\u96c6\u5408\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528FOR\u5faa\u74b0\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DECLARE @i INT;\nFOR @i = 1 TO 5\nBEGIN\n    PRINT 'Counter value: ' + CAST(@i AS VARCHAR);\nEND<\/code><\/pre>\n<p>\u9019\u6bb5\u7a0b\u5f0f\u78bc\u5c07\u6253\u5370\u5f9e1\u52305\u7684\u8a08\u6578\u5668\u503c\u3002<\/p>\n<h2 id=\"%e5%be%aa%e7%92%b0%e7%b5%90%e6%a7%8b%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8-RybwavzafR\">\u5faa\u74b0\u7d50\u69cb\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n<p>\u5faa\u74b0\u7d50\u69cb\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u975e\u5e38\u5ee3\u6cdb\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u6279\u91cf\u8655\u7406\u8cc7\u6599\u7684\u60c5\u6cc1\u4e0b\u3002\u4f8b\u5982\uff0c\u7576\u9700\u8981\u5f9e\u4e00\u500b\u8868\u4e2d\u63d0\u53d6\u591a\u689d\u8a18\u9304\u4e26\u9032\u884c\u8a08\u7b97\u6642\uff0c\u5faa\u74b0\u7d50\u69cb\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u7c21\u5316\u904e\u7a0b\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u5be6\u969b\u7684\u61c9\u7528\u7bc4\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u92b7\u552e\u8a18\u9304\u8868\uff0c\u4e26\u5e0c\u671b\u8a08\u7b97\u6bcf\u500b\u92b7\u552e\u4eba\u54e1\u7684\u7e3d\u92b7\u552e\u984d\uff1a<\/p>\n<pre><code>DECLARE @salesPersonId INT;\nDECLARE @totalSales DECIMAL(10, 2);\nDECLARE sales_cursor CURSOR FOR\nSELECT SalesPersonId FROM SalesRecords;\n\nOPEN sales_cursor;\nFETCH NEXT FROM sales_cursor INTO @salesPersonId;\n\nWHILE @@FETCH_STATUS = 0\nBEGIN\n    SELECT @totalSales = SUM(SaleAmount) FROM SalesRecords WHERE SalesPersonId = @salesPersonId;\n    PRINT 'Sales Person ID: ' + CAST(@salesPersonId AS VARCHAR) + ', Total Sales: ' + CAST(@totalSales AS VARCHAR);\n    FETCH NEXT FROM sales_cursor INTO @salesPersonId;\nEND\n\nCLOSE sales_cursor;\nDEALLOCATE sales_cursor;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u6e38\u6a19\uff08Cursor\uff09\u4f86\u904d\u6b77\u6bcf\u500b\u92b7\u552e\u4eba\u54e1\u7684ID\uff0c\u4e26\u8a08\u7b97\u4ed6\u5011\u7684\u7e3d\u92b7\u552e\u984d\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-RybwavzafR\">\u7e3d\u7d50<\/h2>\n<p>\u5faa\u74b0\u7d50\u69cb\u5728SQL\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u9ad8\u6548\u5730\u8655\u7406\u91cd\u8907\u6027\u4efb\u52d9\u3002\u7121\u8ad6\u662f\u4f7f\u7528WHILE\u3001REPEAT&#8230;UNTIL\u9084\u662fFOR\u5faa\u74b0\uff0c\u9019\u4e9b\u7d50\u69cb\u90fd\u80fd\u5920\u7c21\u5316\u7a0b\u5f0f\u78bc\u4e26\u63d0\u9ad8\u57f7\u884c\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9032\u884c\u5927\u91cf\u8cc7\u6599\u8655\u7406\u7684\u61c9\u7528\u5834\u666f\uff0c\u638c\u63e1\u9019\u4e9b\u5faa\u74b0\u7d50\u69cb\u7684\u4f7f\u7528\u5c07\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u9805\u76ee\u4e2d\u4f7f\u7528\u9019\u4e9b\u6280\u8853\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u6216\u662f\u9700\u8981\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u63f4\u60a8\u7684\u8cc7\u6599\u5eab\u64cd\u4f5c\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eSQL\u4e2d\u5faa\u74b0\u7d50\u69cb\u7684\u4f7f\u7528\uff0c\u89e3\u6790\u5176\u8a9e\u6cd5\u3001\u61c9\u7528\u5834\u666f\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u52a9\u4f60\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\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-191844","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191844","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=191844"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191844\/revisions"}],"predecessor-version":[{"id":191845,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191844\/revisions\/191845"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=191844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=191844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=191844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}