{"id":161191,"date":"2024-11-04T04:22:40","date_gmt":"2024-11-03T20:22:40","guid":{"rendered":"https:\/\/server.hk\/cnblog\/161191\/"},"modified":"2024-11-04T04:22:40","modified_gmt":"2024-11-03T20:22:40","slug":"sql-server%e6%95%b8%e6%93%9a%e6%95%b4%e7%90%86%e7%9a%84%e6%93%8d%e4%bd%9c%e6%96%b9%e6%a1%88%e6%8f%8f%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/161191\/","title":{"rendered":"SQL Server\u6578\u64da\u6574\u7406\u7684\u64cd\u4f5c\u65b9\u6848\u63cf\u8ff0"},"content":{"rendered":"<h1 id=\"sql-server%e6%95%b8%e6%93%9a%e6%95%b4%e7%90%86%e7%9a%84%e6%93%8d%e4%bd%9c%e6%96%b9%e6%a1%88%e6%8f%8f%e8%bf%b0-ArLjWmoIKY\">SQL Server\u6578\u64da\u6574\u7406\u7684\u64cd\u4f5c\u65b9\u6848\u63cf\u8ff0<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u7684\u6574\u7406\u548c\u7ba1\u7406\u5c0d\u65bc\u4f01\u696d\u7684\u904b\u71df\u81f3\u95dc\u91cd\u8981\u3002SQL Server\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u65b9\u6cd5\u4f86\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u6574\u7406\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0eSQL Server\u6578\u64da\u6574\u7406\u7684\u64cd\u4f5c\u65b9\u6848\uff0c\u5305\u62ec\u6578\u64da\u6e05\u7406\u3001\u6578\u64da\u8f49\u63db\u548c\u6578\u64da\u6574\u5408\u7b49\u65b9\u9762\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e6%b8%85%e7%90%86-ArLjWmoIKY\">\u6578\u64da\u6e05\u7406<\/h2>\n<p>\u6578\u64da\u6e05\u7406\u662f\u6578\u64da\u6574\u7406\u904e\u7a0b\u4e2d\u7684\u7b2c\u4e00\u6b65\uff0c\u65e8\u5728\u6d88\u9664\u4e0d\u6e96\u78ba\u3001\u4e0d\u5b8c\u6574\u6216\u91cd\u8907\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6578\u64da\u6e05\u7406\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li><strong>\u522a\u9664\u91cd\u8907\u6578\u64da\uff1a<\/strong>\u4f7f\u7528SQL\u67e5\u8a62\u4f86\u8b58\u5225\u548c\u522a\u9664\u91cd\u8907\u7684\u8a18\u9304\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u53ef\u4ee5\u5e6b\u52a9\u627e\u51fa\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff1a<\/li>\n<\/ul>\n<pre><code>SELECT Email, COUNT(*) \nFROM Users \nGROUP BY Email \nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<ul>\n<li><strong>\u586b\u88dc\u7f3a\u5931\u503c\uff1a<\/strong>\u5c0d\u65bc\u7f3a\u5931\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528\u9810\u8a2d\u503c\u6216\u901a\u904e\u8a08\u7b97\u5e73\u5747\u503c\u3001\u4e2d\u4f4d\u6578\u7b49\u65b9\u6cd5\u4f86\u586b\u88dc\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code>UPDATE Users \nSET Age = (SELECT AVG(Age) FROM Users WHERE Age IS NOT NULL) \nWHERE Age IS NULL;<\/code><\/pre>\n<ul>\n<li><strong>\u683c\u5f0f\u5316\u6578\u64da\uff1a<\/strong>\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0c\u4f8b\u5982\u5c07\u6240\u6709\u7684\u96fb\u8a71\u865f\u78bc\u683c\u5f0f\u5316\u70ba\u7d71\u4e00\u7684\u6a23\u5f0f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%95%b8%e6%93%9a%e8%bd%89%e6%8f%9b-ArLjWmoIKY\">\u6578\u64da\u8f49\u63db<\/h2>\n<p>\u6578\u64da\u8f49\u63db\u662f\u5c07\u6578\u64da\u5f9e\u4e00\u7a2e\u683c\u5f0f\u8f49\u63db\u70ba\u53e6\u4e00\u7a2e\u683c\u5f0f\u7684\u904e\u7a0b\u3002\u9019\u901a\u5e38\u6d89\u53ca\u5230\u6578\u64da\u985e\u578b\u7684\u8f49\u63db\u548c\u6578\u64da\u7d50\u69cb\u7684\u8abf\u6574\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6578\u64da\u8f49\u63db\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u985e\u578b\u8f49\u63db\uff1a<\/strong>\u5728SQL Server\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528CAST\u6216CONVERT\u51fd\u6578\u4f86\u6539\u8b8a\u6578\u64da\u985e\u578b\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code>SELECT CAST(Price AS DECIMAL(10, 2)) \nFROM Products;<\/code><\/pre>\n<ul>\n<li><strong>\u6578\u64da\u7d50\u69cb\u8abf\u6574\uff1a<\/strong>\u6709\u6642\u9700\u8981\u5c07\u6578\u64da\u5f9e\u4e00\u500b\u8868\u8f49\u79fb\u5230\u53e6\u4e00\u500b\u8868\uff0c\u9019\u53ef\u4ee5\u901a\u904eINSERT INTO\u8a9e\u53e5\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code>INSERT INTO Archive_Users (UserID, UserName) \nSELECT UserID, UserName \nFROM Users \nWHERE CreatedDate &lt; &#039;2022-01-01&#039;;<\/code><\/pre>\n<h2 id=\"%e6%95%b8%e6%93%9a%e6%95%b4%e5%90%88-ArLjWmoIKY\">\u6578\u64da\u6574\u5408<\/h2>\n<p>\u6578\u64da\u6574\u5408\u662f\u5c07\u4f86\u81ea\u4e0d\u540c\u4f86\u6e90\u7684\u6578\u64da\u5408\u4f75\u5230\u4e00\u500b\u7d71\u4e00\u7684\u8996\u5716\u4e2d\u3002\u9019\u901a\u5e38\u6d89\u53ca\u5230\u6578\u64da\u7684\u806f\u63a5\u548c\u5408\u4f75\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6578\u64da\u6574\u5408\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528JOIN\u8a9e\u53e5\uff1a<\/strong>\u901a\u904eJOIN\u8a9e\u53e5\u5c07\u591a\u500b\u8868\u4e2d\u7684\u6578\u64da\u5408\u4f75\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code>SELECT Users.UserName, Orders.OrderDate \nFROM Users \nJOIN Orders ON Users.UserID = Orders.UserID;<\/code><\/pre>\n<ul>\n<li><strong>\u4f7f\u7528UNION\u64cd\u4f5c\uff1a<\/strong>\u5c07\u4f86\u81ea\u4e0d\u540c\u8868\u7684\u6578\u64da\u5408\u4f75\u5230\u4e00\u500b\u7d50\u679c\u96c6\u4e2d\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code>SELECT UserName FROM Users \nUNION \nSELECT UserName FROM Guests;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ArLjWmoIKY\">\u7e3d\u7d50<\/h2>\n<p>SQL Server\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u6574\u7406\u7684\u64cd\u4f5c\u65b9\u6848\uff0c\u5305\u62ec\u6578\u64da\u6e05\u7406\u3001\u6578\u64da\u8f49\u63db\u548c\u6578\u64da\u6574\u5408\u7b49\u3002\u9019\u4e9b\u64cd\u4f5c\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u8cea\u91cf\uff0c\u9084\u80fd\u589e\u5f37\u6578\u64da\u7684\u53ef\u7528\u6027\u548c\u53ef\u8b80\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u7ba1\u7406\u6578\u64da\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u6574\u7406\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u7ba1\u7406\u9700\u6c42\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u6574\u7406\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQL Server\u6578\u64da\u6574\u7406\u7684\u64cd\u4f5c\u65b9\u6848\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u78ba\u4fdd\u6578\u64da\u6e96\u78ba\u6027\u8207\u4e00\u81f4\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-161191","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/161191","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=161191"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/161191\/revisions"}],"predecessor-version":[{"id":161192,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/161191\/revisions\/161192"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=161191"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=161191"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=161191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}