{"id":162977,"date":"2024-11-04T19:37:20","date_gmt":"2024-11-04T11:37:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162977\/"},"modified":"2024-11-04T19:37:21","modified_gmt":"2024-11-04T11:37:21","slug":"%e6%95%99%e6%82%a8%e4%bd%bf%e7%94%a8sql%e4%b8%ad%e7%9a%84trunc%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162977\/","title":{"rendered":"\u6559\u60a8\u4f7f\u7528SQL\u4e2d\u7684TRUNC\u51fd\u6578"},"content":{"rendered":"<h1 id=\"%e6%95%99%e6%82%a8%e4%bd%bf%e7%94%a8sql%e4%b8%ad%e7%9a%84trunc%e5%87%bd%e6%95%b8-pQdzkYBMdf\">\u6559\u60a8\u4f7f\u7528SQL\u4e2d\u7684TRUNC\u51fd\u6578<\/h1>\n<p>\u5728SQL\u4e2d\uff0cTRUNC\u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u4e3b\u8981\u7528\u65bc\u6578\u64da\u7684\u622a\u65b7\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\u9084\u662f\u6578\u64da\u6e05\u7406\u904e\u7a0b\u4e2d\uff0cTRUNC\u51fd\u6578\u90fd\u80fd\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u8655\u7406\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eTRUNC\u51fd\u6578\u7684\u7528\u6cd5\u3001\u8a9e\u6cd5\u53ca\u5176\u61c9\u7528\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"trunc%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-pQdzkYBMdf\">TRUNC\u51fd\u6578\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>TRUNC\u51fd\u6578\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5c07\u6578\u5b57\u6216\u65e5\u671f\u622a\u65b7\u5230\u6307\u5b9a\u7684\u5c0f\u6578\u4f4d\u6578\u6216\u65e5\u671f\u90e8\u5206\u3002\u9019\u610f\u5473\u8457\u5b83\u53ef\u4ee5\u7528\u4f86\u53bb\u9664\u4e0d\u5fc5\u8981\u7684\u5c0f\u6578\u4f4d\uff0c\u6216\u662f\u5c07\u65e5\u671f\u622a\u65b7\u5230\u7279\u5b9a\u7684\u6642\u9593\u55ae\u4f4d\uff08\u5982\u5e74\u3001\u6708\u3001\u65e5\u7b49\uff09\u3002<\/p>\n<h2 id=\"trunc%e5%87%bd%e6%95%b8%e7%9a%84%e8%aa%9e%e6%b3%95-pQdzkYBMdf\">TRUNC\u51fd\u6578\u7684\u8a9e\u6cd5<\/h2>\n<p>TRUNC\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>TRUNC(number, [decimal_places])<\/code><\/pre>\n<p>\u6216\u662f\u5c0d\u65bc\u65e5\u671f\u7684\u4f7f\u7528\uff1a<\/p>\n<pre><code>TRUNC(date, [format])<\/code><\/pre>\n<h3 id=\"%e5%8f%83%e6%95%b8%e8%a7%a3%e9%87%8b-pQdzkYBMdf\">\u53c3\u6578\u89e3\u91cb<\/h3>\n<ul>\n<li><strong>number<\/strong>: \u9700\u8981\u88ab\u622a\u65b7\u7684\u6578\u5b57\u3002<\/li>\n<li><strong>decimal_places<\/strong>: \u53ef\u9078\u53c3\u6578\uff0c\u6307\u5b9a\u8981\u4fdd\u7559\u7684\u5c0f\u6578\u4f4d\u6578\u3002\u5982\u679c\u7701\u7565\uff0c\u9810\u8a2d\u70ba0\u3002<\/li>\n<li><strong>date<\/strong>: \u9700\u8981\u88ab\u622a\u65b7\u7684\u65e5\u671f\u3002<\/li>\n<li><strong>format<\/strong>: \u53ef\u9078\u53c3\u6578\uff0c\u6307\u5b9a\u65e5\u671f\u7684\u622a\u65b7\u683c\u5f0f\uff0c\u5982&#8217;YYYY&#8217;\u3001&#8217;MM&#8217;\u3001&#8217;DD&#8217;\u7b49\u3002<\/li>\n<\/ul>\n<h2 id=\"trunc%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-pQdzkYBMdf\">TRUNC\u51fd\u6578\u7684\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<h3 id=\"%e6%95%b8%e5%ad%97%e6%88%aa%e6%96%b7%e7%af%84%e4%be%8b-pQdzkYBMdf\">\u6578\u5b57\u622a\u65b7\u7bc4\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u6578\u5b57123.4567\uff0c\u4e26\u5e0c\u671b\u5c07\u5176\u622a\u65b7\u5230\u5c0f\u6578\u9ede\u5f8c\u5169\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT TRUNC(123.4567, 2) AS truncated_number;<\/code><\/pre>\n<p>\u57f7\u884c\u5f8c\uff0c\u7d50\u679c\u5c07\u986f\u793a\u70ba\uff1a<\/p>\n<pre><code>truncated_number\n-----------------\n123.45\n<\/code><\/pre>\n<h3 id=\"%e6%97%a5%e6%9c%9f%e6%88%aa%e6%96%b7%e7%af%84%e4%be%8b-pQdzkYBMdf\">\u65e5\u671f\u622a\u65b7\u7bc4\u4f8b<\/h3>\n<p>\u5c0d\u65bc\u65e5\u671f\u7684\u622a\u65b7\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u65e5\u671f&#8217;2023-10-15 14:30:00&#8217;\uff0c\u4e26\u5e0c\u671b\u5c07\u5176\u622a\u65b7\u5230\u6708\u4efd\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT TRUNC(TO_DATE('2023-10-15 14:30:00', 'YYYY-MM-DD HH24:MI:SS'), 'MM') AS truncated_date;<\/code><\/pre>\n<p>\u57f7\u884c\u5f8c\uff0c\u7d50\u679c\u5c07\u986f\u793a\u70ba\uff1a<\/p>\n<pre><code>truncated_date\n-----------------\n2023-10-01 00:00:00\n<\/code><\/pre>\n<h2 id=\"trunc%e5%87%bd%e6%95%b8%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-pQdzkYBMdf\">TRUNC\u51fd\u6578\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>TRUNC\u51fd\u6578\u5728\u591a\u7a2e\u5834\u666f\u4e2d\u90fd\u80fd\u767c\u63ee\u4f5c\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u6e05\u7406<\/strong>: \u5728\u6578\u64da\u5eab\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u6e05\u7406\u4e0d\u5fc5\u8981\u7684\u5c0f\u6578\u4f4d\uff0c\u4ee5\u4fbf\u9032\u884c\u66f4\u6e96\u78ba\u7684\u8a08\u7b97\u3002<\/li>\n<li><strong>\u5831\u544a\u751f\u6210<\/strong>: \u5728\u751f\u6210\u5831\u544a\u6642\uff0c\u53ef\u80fd\u9700\u8981\u5c07\u6578\u5b57\u683c\u5f0f\u5316\u70ba\u7279\u5b9a\u7684\u5c0f\u6578\u4f4d\uff0c\u4ee5\u63d0\u9ad8\u53ef\u8b80\u6027\u3002<\/li>\n<li><strong>\u6642\u9593\u7ba1\u7406<\/strong>: \u5728\u8655\u7406\u6642\u9593\u6578\u64da\u6642\uff0c\u53ef\u80fd\u9700\u8981\u5c07\u65e5\u671f\u622a\u65b7\u5230\u7279\u5b9a\u7684\u6642\u9593\u55ae\u4f4d\uff0c\u4ee5\u4fbf\u9032\u884c\u5206\u7d44\u6216\u5206\u6790\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-pQdzkYBMdf\">\u7e3d\u7d50<\/h2>\n<p>TRUNC\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728SQL\u4e2d\u6709\u6548\u5730\u8655\u7406\u6578\u5b57\u548c\u65e5\u671f\u6578\u64da\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528TRUNC\u51fd\u6578\uff0c\u60a8\u53ef\u4ee5\u7c21\u5316\u6578\u64da\u8655\u7406\u904e\u7a0b\uff0c\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u53ef\u8b80\u6027\u3002\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\u64cd\u4f5c\uff0c\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u5206\u6790\u9084\u662f\u5831\u544a\u751f\u6210\uff0c\u5747\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728SQL\u4e2d\u4f7f\u7528TRUNC\u51fd\u6578\uff0c\u7cbe\u78ba\u63a7\u5236\u6578\u5b57\u548c\u65e5\u671f\u7684\u622a\u65b7\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-162977","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162977","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=162977"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162977\/revisions"}],"predecessor-version":[{"id":162978,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162977\/revisions\/162978"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162977"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162977"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162977"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}