{"id":64953,"date":"2024-10-14T12:59:17","date_gmt":"2024-10-14T04:59:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/64953\/"},"modified":"2024-10-14T12:59:18","modified_gmt":"2024-10-14T04:59:18","slug":"mssql%e5%be%9e%e6%95%b8%e5%80%bc%e5%9e%8b%e8%bd%89%e6%8f%9b%e7%82%ba%e5%ad%97%e7%ac%a6%e5%9e%8b%e7%9a%84%e5%af%a6%e8%b8%90%ef%bc%88mssql%e6%95%b8%e5%80%bc%e8%bd%89%e5%ad%97%e7%ac%a6%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/64953\/","title":{"rendered":"MSSQL\u5f9e\u6578\u503c\u578b\u8f49\u63db\u70ba\u5b57\u7b26\u578b\u7684\u5be6\u8e10\uff08mssql\u6578\u503c\u8f49\u5b57\u7b26\uff09"},"content":{"rendered":"<h1 id=\"mssql%e5%be%9e%e6%95%b8%e5%80%bc%e5%9e%8b%e8%bd%89%e6%8f%9b%e7%82%ba%e5%ad%97%e7%ac%a6%e5%9e%8b%e7%9a%84%e5%af%a6%e8%b8%90%ef%bc%88mssql%e6%95%b8%e5%80%bc%e8%bd%89%e5%ad%97%e7%ac%a6%ef%bc%89-amtLYEwWvu\">MSSQL\u5f9e\u6578\u503c\u578b\u8f49\u63db\u70ba\u5b57\u7b26\u578b\u7684\u5be6\u8e10\uff08mssql\u6578\u503c\u8f49\u5b57\u7b26\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u985e\u578b\u7684\u8f49\u63db\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u7279\u5225\u662f\u5728\u4f7f\u7528Microsoft SQL Server\uff08MSSQL\uff09\u6642\uff0c\u5c07\u6578\u503c\u578b\u6578\u64da\u8f49\u63db\u70ba\u5b57\u7b26\u578b\u6578\u64da\u7684\u64cd\u4f5c\u7d93\u5e38\u51fa\u73fe\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728MSSQL\u4e2d\u5be6\u73fe\u9019\u4e00\u8f49\u63db\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e8%bd%89%e6%8f%9b%e6%95%b8%e5%80%bc%e5%9e%8b%e7%82%ba%e5%ad%97%e7%ac%a6%e5%9e%8b-amtLYEwWvu\">\u70ba\u4ec0\u9ebc\u9700\u8981\u8f49\u63db\u6578\u503c\u578b\u70ba\u5b57\u7b26\u578b<\/h2>\n<p>\u6578\u503c\u578b\u6578\u64da\u901a\u5e38\u7528\u65bc\u6578\u5b78\u8a08\u7b97\u548c\u6578\u64da\u5206\u6790\uff0c\u800c\u5b57\u7b26\u578b\u6578\u64da\u5247\u66f4\u9069\u5408\u7528\u65bc\u6587\u672c\u8655\u7406\u548c\u986f\u793a\u3002\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u5c07\u6578\u503c\u578b\u6578\u64da\u8f49\u63db\u70ba\u5b57\u7b26\u578b\uff0c\u4ee5\u4fbf\u9032\u884c\u683c\u5f0f\u5316\u8f38\u51fa\u3001\u751f\u6210\u5831\u544a\u6216\u8207\u5176\u4ed6\u5b57\u7b26\u578b\u6578\u64da\u9032\u884c\u62fc\u63a5\u3002<\/p>\n<h2 id=\"mssql%e4%b8%ad%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-amtLYEwWvu\">MSSQL\u4e2d\u7684\u6578\u64da\u985e\u578b<\/h2>\n<p>MSSQL\u652f\u6301\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u5176\u4e2d\u6578\u503c\u578b\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>INT<\/code>\uff1a\u6574\u6578\u578b<\/li>\n<li><code>FLOAT<\/code>\uff1a\u6d6e\u9ede\u578b<\/li>\n<li><code>DECIMAL<\/code>\uff1a\u7cbe\u78ba\u5c0f\u6578\u578b<\/li>\n<\/ul>\n<p>\u5b57\u7b26\u578b\u6578\u64da\u985e\u578b\u5247\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>CHAR<\/code>\uff1a\u56fa\u5b9a\u9577\u5ea6\u5b57\u7b26\u578b<\/li>\n<li><code>VARCHAR<\/code>\uff1a\u53ef\u8b8a\u9577\u5ea6\u5b57\u7b26\u578b<\/li>\n<li><code>NCHAR<\/code>\uff1a\u56fa\u5b9a\u9577\u5ea6Unicode\u5b57\u7b26\u578b<\/li>\n<li><code>NVARCHAR<\/code>\uff1a\u53ef\u8b8a\u9577\u5ea6Unicode\u5b57\u7b26\u578b<\/li>\n<\/ul>\n<h2 id=\"%e6%95%b8%e5%80%bc%e5%9e%8b%e8%bd%89%e5%ad%97%e7%ac%a6%e5%9e%8b%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%96%b9%e6%b3%95-amtLYEwWvu\">\u6578\u503c\u578b\u8f49\u5b57\u7b26\u578b\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>\u5728MSSQL\u4e2d\uff0c\u5c07\u6578\u503c\u578b\u6578\u64da\u8f49\u63db\u70ba\u5b57\u7b26\u578b\u6578\u64da\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8cast%e5%87%bd%e6%95%b8-amtLYEwWvu\">1. \u4f7f\u7528CAST\u51fd\u6578<\/h3>\n<p><code>CAST<\/code>\u51fd\u6578\u53ef\u4ee5\u5c07\u4e00\u7a2e\u6578\u64da\u985e\u578b\u8f49\u63db\u70ba\u53e6\u4e00\u7a2e\u6578\u64da\u985e\u578b\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528<code>CAST<\/code>\u51fd\u6578\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT CAST(123 AS VARCHAR(10)) AS ConvertedValue;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6574\u6578<code>123<\/code>\u88ab\u8f49\u63db\u70ba\u5b57\u7b26\u578b\uff0c\u7d50\u679c\u70ba<code>'123'<\/code>\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8convert%e5%87%bd%e6%95%b8-amtLYEwWvu\">2. \u4f7f\u7528CONVERT\u51fd\u6578<\/h3>\n<p>\u53e6\u4e00\u7a2e\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528<code>CONVERT<\/code>\u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u683c\u5f0f\u9078\u9805\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528<code>CONVERT<\/code>\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT CONVERT(VARCHAR(10), 123.45) AS ConvertedValue;<\/code><\/pre>\n<p>\u9019\u88e1\uff0c\u6d6e\u9ede\u6578<code>123.45<\/code>\u88ab\u8f49\u63db\u70ba\u5b57\u7b26\u578b\uff0c\u7d50\u679c\u70ba<code>'123.45'<\/code>\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8str%e5%87%bd%e6%95%b8-amtLYEwWvu\">3. \u4f7f\u7528STR\u51fd\u6578<\/h3>\n<p>\u5c0d\u65bc\u6d6e\u9ede\u6578\uff0c<code>STR<\/code>\u51fd\u6578\u4e5f\u53ef\u4ee5\u7528\u4f86\u9032\u884c\u8f49\u63db\u3002\u9019\u500b\u51fd\u6578\u5141\u8a31\u60a8\u6307\u5b9a\u7e3d\u9577\u5ea6\u548c\u5c0f\u6578\u4f4d\u6578\uff1a<\/p>\n<pre><code>SELECT STR(123.456, 6, 2) AS ConvertedValue;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>123.456<\/code>\u88ab\u8f49\u63db\u70ba\u5b57\u7b26\u578b\uff0c\u4e26\u4e14\u683c\u5f0f\u5316\u70ba<code>'123.46'<\/code>\uff08\u56db\u6368\u4e94\u5165\u5230\u5c0f\u6578\u9ede\u5f8c\u5169\u4f4d\uff09\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-amtLYEwWvu\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u6578\u64da\u985e\u578b\u8f49\u63db\u6642\uff0c\u9700\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u8f49\u63db\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e1f\u5931\uff0c\u7279\u5225\u662f\u5728\u5f9e\u6d6e\u9ede\u578b\u8f49\u63db\u70ba\u6574\u6578\u578b\u6642\u3002<\/li>\n<li>\u78ba\u4fdd\u76ee\u6a19\u5b57\u7b26\u578b\u7684\u9577\u5ea6\u8db3\u5920\u5bb9\u7d0d\u8f49\u63db\u5f8c\u7684\u6578\u64da\u3002<\/li>\n<li>\u5728\u9032\u884c\u62fc\u63a5\u64cd\u4f5c\u6642\uff0c\u6578\u503c\u578b\u6578\u64da\u5fc5\u9808\u5148\u8f49\u63db\u70ba\u5b57\u7b26\u578b\uff0c\u5426\u5247\u6703\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-amtLYEwWvu\">\u7d50\u8ad6<\/h2>\n<p>\u5728MSSQL\u4e2d\uff0c\u5c07\u6578\u503c\u578b\u6578\u64da\u8f49\u63db\u70ba\u5b57\u7b26\u578b\u662f\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u64cd\u4f5c\u3002\u901a\u904e\u4f7f\u7528<code>CAST<\/code>\u3001<code>CONVERT<\/code>\u548c<code>STR<\/code>\u7b49\u51fd\u6578\uff0c\u60a8\u53ef\u4ee5\u9748\u6d3b\u5730\u8655\u7406\u6578\u64da\u985e\u578b\u8f49\u63db\u7684\u9700\u6c42\u3002\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u6578\u64da\u7684\u683c\u5f0f\u5316\u548c\u986f\u793a\uff0c\u9084\u80fd\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u9748\u6d3b\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5b58\u5132\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u904b\u884c\uff0c<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u90fd\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MSSQL\u4e2d\u6578\u503c\u578b\u8f49\u5b57\u7b26\u578b\u7684\u5be6\u8e10\u6280\u5de7\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u985e\u578b\u8f49\u63db\u4ee5\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-64953","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/64953","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=64953"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/64953\/revisions"}],"predecessor-version":[{"id":64954,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/64953\/revisions\/64954"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=64953"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=64953"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=64953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}