{"id":153075,"date":"2024-11-02T04:25:18","date_gmt":"2024-11-01T20:25:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/153075\/"},"modified":"2024-11-02T04:25:19","modified_gmt":"2024-11-01T20:25:19","slug":"%e5%89%b5%e5%bb%ba-sql-%e5%87%bd%e6%95%b8%e7%9a%84%e5%af%a6%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/153075\/","title":{"rendered":"\u5275\u5efa SQL \u51fd\u6578\u7684\u5be6\u4f8b"},"content":{"rendered":"<h1 id=\"%e5%89%b5%e5%bb%ba-sql-%e5%87%bd%e6%95%b8%e7%9a%84%e5%af%a6%e4%be%8b-HYKnjEuIhQ\">\u5275\u5efa SQL \u51fd\u6578\u7684\u5be6\u4f8b<\/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\u3002SQL \u51fd\u6578\u662f\u7528\u4f86\u57f7\u884c\u7279\u5b9a\u4efb\u52d9\u7684\u7a0b\u5f0f\u78bc\u584a\uff0c\u80fd\u5920\u7c21\u5316\u8907\u96dc\u7684\u67e5\u8a62\u4e26\u63d0\u9ad8\u6548\u7387\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5275\u5efa SQL \u51fd\u6578\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u4f8b\u4f86\u5e6b\u52a9\u7406\u89e3\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-sql-%e5%87%bd%e6%95%b8%ef%bc%9f-HYKnjEuIhQ\">\u4ec0\u9ebc\u662f SQL \u51fd\u6578\uff1f<\/h2>\n<p>SQL \u51fd\u6578\u662f\u4e00\u7a2e\u53ef\u91cd\u7528\u7684\u7a0b\u5f0f\u78bc\u7247\u6bb5\uff0c\u901a\u5e38\u7528\u65bc\u57f7\u884c\u7279\u5b9a\u7684\u8a08\u7b97\u6216\u64cd\u4f5c\u3002\u5b83\u5011\u53ef\u4ee5\u63a5\u53d7\u53c3\u6578\u4e26\u8fd4\u56de\u7d50\u679c\uff0c\u9019\u4f7f\u5f97\u5b83\u5011\u5728\u8655\u7406\u91cd\u8907\u6027\u4efb\u52d9\u6642\u975e\u5e38\u6709\u7528\u3002SQL \u51fd\u6578\u53ef\u4ee5\u5206\u70ba\u5169\u985e\uff1a\u5167\u5efa\u51fd\u6578\u548c\u4f7f\u7528\u8005\u81ea\u5b9a\u7fa9\u51fd\u6578\uff08UDF\uff09\u3002\u5167\u5efa\u51fd\u6578\u662f\u8cc7\u6599\u5eab\u7cfb\u7d71\u81ea\u5e36\u7684\uff0c\u800c\u4f7f\u7528\u8005\u81ea\u5b9a\u7fa9\u51fd\u6578\u5247\u662f\u7531\u958b\u767c\u8005\u6839\u64da\u9700\u6c42\u5275\u5efa\u7684\u3002<\/p>\n<h2 id=\"%e5%89%b5%e5%bb%ba%e4%bd%bf%e7%94%a8%e8%80%85%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-HYKnjEuIhQ\">\u5275\u5efa\u4f7f\u7528\u8005\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u5275\u5efa\u4f7f\u7528\u8005\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE FUNCTION \u51fd\u6578\u540d\u7a31 (\u53c3\u6578\u985e\u578b)\nRETURNS \u8fd4\u56de\u985e\u578b\nAS\nBEGIN\n    -- \u51fd\u6578\u908f\u8f2f\n    RETURN \u8fd4\u56de\u503c;\nEND;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<strong>\u51fd\u6578\u540d\u7a31<\/strong>\u662f\u60a8\u70ba\u51fd\u6578\u6307\u5b9a\u7684\u540d\u7a31\uff0c<strong>\u53c3\u6578\u985e\u578b<\/strong>\u662f\u51fd\u6578\u6240\u9700\u7684\u8f38\u5165\u53c3\u6578\uff0c<strong>\u8fd4\u56de\u985e\u578b<\/strong>\u662f\u51fd\u6578\u8fd4\u56de\u7684\u8cc7\u6599\u985e\u578b\u3002<\/p>\n<h2 id=\"%e5%af%a6%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e8%a8%88%e7%ae%97%e5%b9%b3%e6%96%b9%e7%9a%84%e5%87%bd%e6%95%b8-HYKnjEuIhQ\">\u5be6\u4f8b\uff1a\u5275\u5efa\u4e00\u500b\u8a08\u7b97\u5e73\u65b9\u7684\u51fd\u6578<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684 SQL \u51fd\u6578\u793a\u4f8b\uff0c\u7528\u65bc\u8a08\u7b97\u4e00\u500b\u6578\u5b57\u7684\u5e73\u65b9\uff1a<\/p>\n<pre><code>CREATE FUNCTION CalculateSquare (@number INT)\nRETURNS INT\nAS\nBEGIN\n    RETURN @number * @number;\nEND;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <strong>CalculateSquare<\/strong> \u7684\u51fd\u6578\uff0c\u5b83\u63a5\u53d7\u4e00\u500b\u6574\u6578\u53c3\u6578 <strong>@number<\/strong>\uff0c\u4e26\u8fd4\u56de\u8a72\u6578\u5b57\u7684\u5e73\u65b9\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e5%87%bd%e6%95%b8-HYKnjEuIhQ\">\u4f7f\u7528\u51fd\u6578<\/h3>\n<p>\u5275\u5efa\u51fd\u6578\u5f8c\uff0c\u60a8\u53ef\u4ee5\u5728 SQL \u67e5\u8a62\u4e2d\u4f7f\u7528\u5b83\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT dbo.CalculateSquare(5) AS SquareValue;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de 25\uff0c\u56e0\u70ba 5 \u7684\u5e73\u65b9\u662f 25\u3002<\/p>\n<h2 id=\"%e5%af%a6%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e8%a8%88%e7%ae%97%e5%93%a1%e5%b7%a5%e5%b9%b4%e9%bd%a1%e7%9a%84%e5%87%bd%e6%95%b8-HYKnjEuIhQ\">\u5be6\u4f8b\uff1a\u5275\u5efa\u4e00\u500b\u8a08\u7b97\u54e1\u5de5\u5e74\u9f61\u7684\u51fd\u6578<\/h2>\n<p>\u53e6\u4e00\u500b\u5be6\u7528\u7684\u4f8b\u5b50\u662f\u5275\u5efa\u4e00\u500b\u8a08\u7b97\u54e1\u5de5\u5e74\u9f61\u7684\u51fd\u6578\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u54e1\u5de5\u8cc7\u6599\u8868\uff0c\u5305\u542b\u54e1\u5de5\u7684\u51fa\u751f\u65e5\u671f\uff0c\u6211\u5011\u53ef\u4ee5\u5275\u5efa\u4e00\u500b\u51fd\u6578\u4f86\u8a08\u7b97\u5e74\u9f61\uff1a<\/p>\n<pre><code>CREATE FUNCTION CalculateAge (@birthDate DATE)\nRETURNS INT\nAS\nBEGIN\n    RETURN DATEDIFF(YEAR, @birthDate, GETDATE());\nEND;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<strong>CalculateAge<\/strong> \u51fd\u6578\u63a5\u53d7\u4e00\u500b\u65e5\u671f\u53c3\u6578 <strong>@birthDate<\/strong>\uff0c\u4e26\u4f7f\u7528 <strong>DATEDIFF<\/strong> \u51fd\u6578\u8a08\u7b97\u5f9e\u51fa\u751f\u65e5\u671f\u5230\u7576\u524d\u65e5\u671f\u7684\u5e74\u6578\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e5%b9%b4%e9%bd%a1%e8%a8%88%e7%ae%97%e5%87%bd%e6%95%b8-HYKnjEuIhQ\">\u4f7f\u7528\u5e74\u9f61\u8a08\u7b97\u51fd\u6578<\/h3>\n<p>\u60a8\u53ef\u4ee5\u9019\u6a23\u4f7f\u7528\u9019\u500b\u51fd\u6578\uff1a<\/p>\n<pre><code>SELECT dbo.CalculateAge(BirthDate) AS Age FROM Employees;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6bcf\u4f4d\u54e1\u5de5\u7684\u5e74\u9f61\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-HYKnjEuIhQ\">\u7e3d\u7d50<\/h2>\n<p>SQL \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u7c21\u5316\u67e5\u8a62\u548c\u63d0\u9ad8\u6548\u7387\u3002\u901a\u904e\u5275\u5efa\u4f7f\u7528\u8005\u81ea\u5b9a\u7fa9\u51fd\u6578\uff0c\u60a8\u53ef\u4ee5\u6839\u64da\u7279\u5b9a\u9700\u6c42\u57f7\u884c\u8907\u96dc\u7684\u8a08\u7b97\u6216\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u8a08\u7b97\u5e73\u65b9\u9084\u662f\u8a08\u7b97\u5e74\u9f61\uff0c\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u5920\u63d0\u9ad8\u8cc7\u6599\u8655\u7406\u7684\u9748\u6d3b\u6027\u548c\u53ef\u91cd\u7528\u6027\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u8cc7\u6599\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5f0f\u548c\u8cc7\u6599\u5eab\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5275\u5efa SQL \u51fd\u6578\u7684\u5be6\u4f8b\uff0c\u5b78\u7fd2\u5982\u4f55\u7de8\u5beb\u548c\u4f7f\u7528\u81ea\u5b9a\u7fa9\u51fd\u6578\u4ee5\u63d0\u5347\u6578\u64da\u5eab\u64cd\u4f5c\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-153075","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153075","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=153075"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153075\/revisions"}],"predecessor-version":[{"id":153076,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153075\/revisions\/153076"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=153075"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=153075"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=153075"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}