{"id":138311,"date":"2024-10-31T13:25:25","date_gmt":"2024-10-31T05:25:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/138311\/"},"modified":"2024-10-31T13:25:26","modified_gmt":"2024-10-31T05:25:26","slug":"sql-server%ef%bc%8coracle%ef%bc%8cdb2%e4%b8%8a%e5%b8%b8%e7%94%a8%e5%87%bd%e6%95%b8%e5%b0%8d%e6%af%94%e8%88%87%e7%b8%bd%e7%b5%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/138311\/","title":{"rendered":"SQL Server\uff0cOracle\uff0cDB2\u4e0a\u5e38\u7528\u51fd\u6578\u5c0d\u6bd4\u8207\u7e3d\u7d50"},"content":{"rendered":"<h1 id=\"sql-server%e3%80%81oracle%e3%80%81db2%e4%b8%8a%e5%b8%b8%e7%94%a8%e5%87%bd%e6%95%b8%e5%b0%8d%e6%af%94%e8%88%87%e7%b8%bd%e7%b5%90-faLRcubBMq\">SQL Server\u3001Oracle\u3001DB2\u4e0a\u5e38\u7528\u51fd\u6578\u5c0d\u6bd4\u8207\u7e3d\u7d50<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u51fd\u6578\u662f\u7528\u4f86\u57f7\u884c\u7279\u5b9a\u64cd\u4f5c\u7684\u9810\u5b9a\u7fa9\u7a0b\u5f0f\u78bc\u7247\u6bb5\u3002\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u5982 SQL Server\u3001Oracle \u548c DB2 \u63d0\u4f9b\u4e86\u5404\u81ea\u7684\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u5728\u8a9e\u6cd5\u548c\u529f\u80fd\u4e0a\u53ef\u80fd\u6703\u6709\u6240\u4e0d\u540c\u3002\u672c\u6587\u5c07\u5c0d\u9019\u4e09\u7a2e\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u5e38\u7528\u7684\u51fd\u6578\u9032\u884c\u6bd4\u8f03\u8207\u7e3d\u7d50\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\u3002<\/p>\n<h2 id=\"1-%e5%ad%97%e4%b8%b2%e8%99%95%e7%90%86%e5%87%bd%e6%95%b8-faLRcubBMq\">1. \u5b57\u4e32\u8655\u7406\u51fd\u6578<\/h2>\n<p>\u5b57\u4e32\u8655\u7406\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u5e38\u898b\u7684\u9700\u6c42\u3002\u4ee5\u4e0b\u662f SQL Server\u3001Oracle \u548c DB2 \u4e2d\u4e00\u4e9b\u5e38\u7528\u7684\u5b57\u4e32\u8655\u7406\u51fd\u6578\u7684\u6bd4\u8f03\uff1a<\/p>\n<ul>\n<li><strong>\u5b57\u4e32\u9577\u5ea6<\/strong>\n<ul>\n<li>SQL Server: <code>LEN(string)<\/code><\/li>\n<li>Oracle: <code>LENGTH(string)<\/code><\/li>\n<li>DB2: <code>LENGTH(string)<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>\u5b57\u4e32\u9023\u63a5<\/strong>\n<ul>\n<li>SQL Server: <code>string1 + string2<\/code><\/li>\n<li>Oracle: <code>string1 || string2<\/code><\/li>\n<li>DB2: <code>string1 || string2<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>\u5b57\u4e32\u8f49\u63db\u70ba\u5927\u5beb<\/strong>\n<ul>\n<li>SQL Server: <code>UPPER(string)<\/code><\/li>\n<li>Oracle: <code>UPPER(string)<\/code><\/li>\n<li>DB2: <code>UPPER(string)<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 id=\"2-%e6%95%b8%e5%ad%b8%e5%87%bd%e6%95%b8-faLRcubBMq\">2. \u6578\u5b78\u51fd\u6578<\/h2>\n<p>\u6578\u5b78\u51fd\u6578\u5728\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u4e2d\u975e\u5e38\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4e09\u7a2e\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u7684\u6578\u5b78\u51fd\u6578\u6bd4\u8f03\uff1a<\/p>\n<ul>\n<li><strong>\u53d6\u6574<\/strong>\n<ul>\n<li>SQL Server: <code>ROUND(number, decimal_places)<\/code><\/li>\n<li>Oracle: <code>ROUND(number, decimal_places)<\/code><\/li>\n<li>DB2: <code>ROUND(number, decimal_places)<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>\u7d55\u5c0d\u503c<\/strong>\n<ul>\n<li>SQL Server: <code>ABS(number)<\/code><\/li>\n<li>Oracle: <code>ABS(number)<\/code><\/li>\n<li>DB2: <code>ABS(number)<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>\u96a8\u6a5f\u6578<\/strong>\n<ul>\n<li>SQL Server: <code>RAND()<\/code><\/li>\n<li>Oracle: <code>DBMS_RANDOM.VALUE()<\/code><\/li>\n<li>DB2: <code>RAND()<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 id=\"3-%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8-faLRcubBMq\">3. \u65e5\u671f\u548c\u6642\u9593\u51fd\u6578<\/h2>\n<p>\u65e5\u671f\u548c\u6642\u9593\u7684\u8655\u7406\u5728\u8a31\u591a\u61c9\u7528\u4e2d\u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u4ee5\u4e0b\u662f\u4e09\u7a2e\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\u7684\u6bd4\u8f03\uff1a<\/p>\n<ul>\n<li><strong>\u7576\u524d\u65e5\u671f\u548c\u6642\u9593<\/strong>\n<ul>\n<li>SQL Server: <code>GETDATE()<\/code><\/li>\n<li>Oracle: <code>SYSDATE<\/code><\/li>\n<li>DB2: <code>CURRENT TIMESTAMP<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>\u65e5\u671f\u52a0\u6e1b<\/strong>\n<ul>\n<li>SQL Server: <code>DATEADD(unit, number, date)<\/code><\/li>\n<li>Oracle: <code>date + number<\/code> (number \u70ba\u5929\u6578)<\/li>\n<li>DB2: <code>date + number DAYS<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 id=\"4-%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-faLRcubBMq\">4. \u805a\u5408\u51fd\u6578<\/h2>\n<p>\u805a\u5408\u51fd\u6578\u7528\u65bc\u8a08\u7b97\u4e00\u7d44\u503c\u7684\u7e3d\u548c\u3001\u5e73\u5747\u503c\u7b49\u3002\u4ee5\u4e0b\u662f\u4e09\u7a2e\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u7684\u805a\u5408\u51fd\u6578\u6bd4\u8f03\uff1a<\/p>\n<ul>\n<li><strong>\u8a08\u6578<\/strong>\n<ul>\n<li>SQL Server: <code>COUNT(column)<\/code><\/li>\n<li>Oracle: <code>COUNT(column)<\/code><\/li>\n<li>DB2: <code>COUNT(column)<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>\u7e3d\u548c<\/strong>\n<ul>\n<li>SQL Server: <code>SUM(column)<\/code><\/li>\n<li>Oracle: <code>SUM(column)<\/code><\/li>\n<li>DB2: <code>SUM(column)<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>\u5e73\u5747\u503c<\/strong>\n<ul>\n<li>SQL Server: <code>AVG(column)<\/code><\/li>\n<li>Oracle: <code>AVG(column)<\/code><\/li>\n<li>DB2: <code>AVG(column)<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-faLRcubBMq\">\u7e3d\u7d50<\/h2>\n<p>\u5728\u9078\u64c7\u6578\u64da\u5eab\u7cfb\u7d71\u6642\uff0c\u4e86\u89e3\u5404\u7a2e\u51fd\u6578\u7684\u5dee\u7570\u548c\u7279\u9ede\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002SQL Server\u3001Oracle \u548c DB2 \u5404\u81ea\u63d0\u4f9b\u4e86\u8c50\u5bcc\u7684\u51fd\u6578\u5eab\uff0c\u80fd\u5920\u6eff\u8db3\u4e0d\u540c\u7684\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u5b57\u4e32\u8655\u7406\u3001\u6578\u5b78\u8a08\u7b97\u9084\u662f\u65e5\u671f\u6642\u9593\u7684\u64cd\u4f5c\uff0c\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u9ad8\u6548\u5730\u5b8c\u6210\u4efb\u52d9\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f\u5176\u4ed6\u96f2\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6bd4\u8f03SQL Server\u3001Oracle\u548cDB2\u7684\u5e38\u7528\u51fd\u6578\uff0c\u7e3d\u7d50\u5176\u7279\u9ede\u8207\u5dee\u7570\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\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-138311","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138311","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=138311"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138311\/revisions"}],"predecessor-version":[{"id":138312,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138311\/revisions\/138312"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=138311"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=138311"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=138311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}