{"id":179974,"date":"2024-11-09T06:21:21","date_gmt":"2024-11-08T22:21:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179974\/"},"modified":"2024-11-09T06:21:22","modified_gmt":"2024-11-08T22:21:22","slug":"%e5%a6%82%e4%bd%95%e6%ad%a3%e7%a2%ba%e5%b0%8d-oracle-trunc-%e5%87%bd%e6%95%b8%e9%80%b2%e8%a1%8c%e6%93%8d%e4%bd%9c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179974\/","title":{"rendered":"\u5982\u4f55\u6b63\u78ba\u5c0d Oracle trunc() \u51fd\u6578\u9032\u884c\u64cd\u4f5c\uff1f"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e6%ad%a3%e7%a2%ba%e5%b0%8d-oracle-trunc-%e5%87%bd%e6%95%b8%e9%80%b2%e8%a1%8c%e6%93%8d%e4%bd%9c%ef%bc%9f-VoTyQECpAF\">\u5982\u4f55\u6b63\u78ba\u5c0d Oracle trunc() \u51fd\u6578\u9032\u884c\u64cd\u4f5c\uff1f<\/h1>\n<p>\u5728 Oracle \u6578\u64da\u5eab\u4e2d\uff0c<code>trunc()<\/code> \u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u4e3b\u8981\u7528\u65bc\u622a\u65b7\u6578\u5b57\u6216\u65e5\u671f\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u5728\u6578\u64da\u8655\u7406\u904e\u7a0b\u4e2d\u7372\u5f97\u66f4\u7cbe\u78ba\u7684\u7d50\u679c\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u63a7\u5236\u6578\u64da\u683c\u5f0f\u7684\u60c5\u6cc1\u4e0b\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e <code>trunc()<\/code> \u51fd\u6578\u7684\u7528\u6cd5\u3001\u53c3\u6578\u4ee5\u53ca\u4e00\u4e9b\u5be6\u969b\u7684\u61c9\u7528\u793a\u4f8b\u3002<\/p>\n<h2 id=\"trunc-%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-VoTyQECpAF\">trunc() \u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 Oracle \u4e2d\uff0c<code>trunc()<\/code> \u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>TRUNC(value [, decimal_places])<\/code><\/pre>\n<p>\u9019\u88e1\uff0c<code>value<\/code> \u662f\u8981\u88ab\u622a\u65b7\u7684\u6578\u5b57\u6216\u65e5\u671f\uff0c\u800c <code>decimal_places<\/code> \u662f\u53ef\u9078\u7684\u53c3\u6578\uff0c\u6307\u5b9a\u8981\u4fdd\u7559\u7684\u5c0f\u6578\u4f4d\u6578\u3002\u5982\u679c\u4e0d\u63d0\u4f9b <code>decimal_places<\/code>\uff0c\u5247\u9ed8\u8a8d\u70ba 0\uff0c\u9019\u610f\u5473\u8457\u5c07\u6578\u5b57\u622a\u65b7\u70ba\u6574\u6578\u3002<\/p>\n<h2 id=\"%e6%95%b8%e5%ad%97%e7%9a%84%e6%88%aa%e6%96%b7-VoTyQECpAF\">\u6578\u5b57\u7684\u622a\u65b7<\/h2>\n<p>\u7576\u5c0d\u6578\u5b57\u4f7f\u7528 <code>trunc()<\/code> \u51fd\u6578\u6642\uff0c\u5b83\u6703\u6839\u64da\u6307\u5b9a\u7684\u5c0f\u6578\u4f4d\u6578\u4f86\u622a\u65b7\u6578\u5b57\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT TRUNC(123.4567, 2) FROM dual;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de <code>123.45<\/code>\uff0c\u56e0\u70ba\u5b83\u5c07\u6578\u5b57\u622a\u65b7\u5230\u5c0f\u6578\u9ede\u5f8c\u5169\u4f4d\u3002<\/p>\n<h3 id=\"%e4%b8%8d%e6%8c%87%e5%ae%9a%e5%b0%8f%e6%95%b8%e4%bd%8d%e6%95%b8%e7%9a%84%e6%83%85%e6%b3%81-VoTyQECpAF\">\u4e0d\u6307\u5b9a\u5c0f\u6578\u4f4d\u6578\u7684\u60c5\u6cc1<\/h3>\n<p>\u5982\u679c\u4e0d\u6307\u5b9a\u5c0f\u6578\u4f4d\u6578\uff0c\u5247\u9ed8\u8a8d\u70ba 0\uff1a<\/p>\n<pre><code>SELECT TRUNC(123.4567) FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de <code>123<\/code>\uff0c\u56e0\u70ba\u5b83\u5c07\u6578\u5b57\u622a\u65b7\u70ba\u6574\u6578\u3002<\/p>\n<h2 id=\"%e6%97%a5%e6%9c%9f%e7%9a%84%e6%88%aa%e6%96%b7-VoTyQECpAF\">\u65e5\u671f\u7684\u622a\u65b7<\/h2>\n<p>\u9664\u4e86\u6578\u5b57\uff0c<code>trunc()<\/code> \u51fd\u6578\u9084\u53ef\u4ee5\u7528\u65bc\u65e5\u671f\u3002\u7576\u5c0d\u65e5\u671f\u4f7f\u7528 <code>trunc()<\/code> \u6642\uff0c\u53ef\u4ee5\u6307\u5b9a\u8981\u622a\u65b7\u5230\u7684\u6642\u9593\u55ae\u4f4d\uff0c\u4f8b\u5982\u5e74\u3001\u6708\u6216\u65e5\u3002\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>TRUNC(date [, format])<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>date<\/code> \u662f\u8981\u88ab\u622a\u65b7\u7684\u65e5\u671f\uff0c\u800c <code>format<\/code> \u662f\u53ef\u9078\u7684\u53c3\u6578\uff0c\u6307\u5b9a\u8981\u622a\u65b7\u5230\u7684\u6642\u9593\u55ae\u4f4d\u3002\u5e38\u7528\u7684\u683c\u5f0f\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>'YYYY'<\/code> &#8211; \u622a\u65b7\u5230\u5e74\u4efd<\/li>\n<li><code>'MM'<\/code> &#8211; \u622a\u65b7\u5230\u6708\u4efd<\/li>\n<li><code>'DD'<\/code> &#8211; \u622a\u65b7\u5230\u65e5\u671f<\/li>\n<\/ul>\n<h3 id=\"%e6%97%a5%e6%9c%9f%e6%88%aa%e6%96%b7%e7%a4%ba%e4%be%8b-VoTyQECpAF\">\u65e5\u671f\u622a\u65b7\u793a\u4f8b<\/h3>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u7576\u524d\u65e5\u671f\u622a\u65b7\u5230\u7576\u6708\u7684\u7b2c\u4e00\u5929\uff1a<\/p>\n<pre><code>SELECT TRUNC(SYSDATE, 'MM') FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u7576\u6708\u7684\u7b2c\u4e00\u5929\uff0c\u4f8b\u5982 <code>2023-10-01<\/code>\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-VoTyQECpAF\">\u4f7f\u7528\u5834\u666f<\/h2>\n<p><code>trunc()<\/code> \u51fd\u6578\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5728\u5831\u544a\u751f\u6210\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u5c07\u6578\u64da\u683c\u5f0f\u5316\u70ba\u7279\u5b9a\u7684\u5c0f\u6578\u4f4d\u6578\uff0c\u6216\u8005\u5728\u9032\u884c\u65e5\u671f\u8a08\u7b97\u6642\uff0c\u9700\u8981\u5c07\u65e5\u671f\u622a\u65b7\u5230\u7279\u5b9a\u7684\u6642\u9593\u55ae\u4f4d\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-VoTyQECpAF\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 <code>trunc()<\/code> \u51fd\u6578\u6642\uff0c\u9700\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n    &lt;li<code>trunc()<\/code> \u51fd\u6578\u4e0d\u6703\u9032\u884c\u56db\u6368\u4e94\u5165\uff0c\u800c\u662f\u76f4\u63a5\u622a\u65b7\u3002<\/li>\n<li>\u5c0d\u65bc\u65e5\u671f\uff0c\u622a\u65b7\u5f8c\u7684\u6642\u9593\u90e8\u5206\u5c07\u88ab\u8a2d\u7f6e\u70ba 00:00:00\u3002<\/li>\n<li>\u5728\u8655\u7406\u8ca0\u6578\u6642\uff0c<code>trunc()<\/code> \u51fd\u6578\u7684\u884c\u70ba\u53ef\u80fd\u8207\u9810\u671f\u4e0d\u540c\uff0c\u9700\u8b39\u614e\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-VoTyQECpAF\">\u7e3d\u7d50<\/h2>\n<p>Oracle \u7684 <code>trunc()<\/code> \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728\u6578\u64da\u8655\u7406\u904e\u7a0b\u4e2d\u9032\u884c\u7cbe\u78ba\u7684\u622a\u65b7\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u5c0d\u6578\u5b57\u9084\u662f\u65e5\u671f\u9032\u884c\u622a\u65b7\uff0c\u6b63\u78ba\u4f7f\u7528\u6b64\u51fd\u6578\u90fd\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9032\u884c\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u7684\u7528\u6236\u4f86\u8aaa\uff0c\u638c\u63e1 <code>trunc()<\/code> \u51fd\u6578\u7684\u7528\u6cd5\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u7528\u6236\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u7db2\u7ad9\u6258\u7ba1\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u6b63\u78ba\u4f7f\u7528 Oracle trunc() \u51fd\u6578\uff0c\u638c\u63e1\u65e5\u671f\u548c\u6578\u5b57\u7684\u622a\u65b7\u6280\u5de7\uff0c\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-179974","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179974","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=179974"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179974\/revisions"}],"predecessor-version":[{"id":179975,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179974\/revisions\/179975"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179974"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179974"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179974"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}