{"id":79628,"date":"2024-10-16T13:21:17","date_gmt":"2024-10-16T05:21:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79628\/"},"modified":"2024-10-16T13:21:17","modified_gmt":"2024-10-16T05:21:17","slug":"mysql%e6%8c%87%e4%bb%a4-round%ef%bc%88%e5%9b%9b%e8%88%8d%e4%ba%94%e5%85%a5%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79628\/","title":{"rendered":"MySQL\u6307\u4ee4: ROUND()\uff08\u56db\u820d\u4e94\u5165\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-round%ef%bc%88%e5%9b%9b%e8%88%8d%e4%ba%94%e5%85%a5%ef%bc%89-VubcIjSHas\">MySQL\u6307\u4ee4: ROUND()\uff08\u56db\u820d\u4e94\u5165\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u8655\u7406\u6578\u64da\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662fROUND()\u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u7684\u4e3b\u8981\u7528\u9014\u662f\u5c0d\u6578\u5b57\u9032\u884c\u56db\u820d\u4e94\u5165\uff0c\u9019\u5728\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u4e2d\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<h2 id=\"round%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-VubcIjSHas\">ROUND()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>ROUND()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ROUND(number, decimals)<\/code><\/pre>\n<ul>\n<li><strong>number<\/strong>: \u9700\u8981\u9032\u884c\u56db\u820d\u4e94\u5165\u7684\u6578\u5b57\u3002<\/li>\n<li><strong>decimals<\/strong>: \u6307\u5b9a\u8981\u4fdd\u7559\u7684\u5c0f\u6578\u4f4d\u6578\u3002\u5982\u679c\u7701\u7565\u6b64\u53c3\u6578\uff0c\u5247\u9ed8\u8a8d\u70ba0\uff0c\u8868\u793a\u56db\u820d\u4e94\u5165\u5230\u6700\u63a5\u8fd1\u7684\u6574\u6578\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-VubcIjSHas\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528ROUND()\u51fd\u6578\u7684\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b1-%e5%9b%9b%e8%88%8d%e4%ba%94%e5%85%a5%e5%88%b0%e6%95%b4%e6%95%b8-VubcIjSHas\">\u7bc4\u4f8b1: \u56db\u820d\u4e94\u5165\u5230\u6574\u6578<\/h3>\n<pre><code>SELECT ROUND(123.456);<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de<strong>123<\/strong>\uff0c\u56e0\u70ba\u5b83\u5c07\u6578\u5b57\u56db\u820d\u4e94\u5165\u5230\u6700\u63a5\u8fd1\u7684\u6574\u6578\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b2-%e5%9b%9b%e8%88%8d%e4%ba%94%e5%85%a5%e5%88%b0%e5%b0%8f%e6%95%b8%e4%bd%8d-VubcIjSHas\">\u7bc4\u4f8b2: \u56db\u820d\u4e94\u5165\u5230\u5c0f\u6578\u4f4d<\/h3>\n<pre><code>SELECT ROUND(123.456, 2);<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de<strong>123.46<\/strong>\uff0c\u56e0\u70ba\u5b83\u5c07\u6578\u5b57\u56db\u820d\u4e94\u5165\u5230\u5c0f\u6578\u9ede\u5f8c\u5169\u4f4d\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b3-%e8%b2%a0%e6%95%b8%e7%9a%84%e5%9b%9b%e8%88%8d%e4%ba%94%e5%85%a5-VubcIjSHas\">\u7bc4\u4f8b3: \u8ca0\u6578\u7684\u56db\u820d\u4e94\u5165<\/h3>\n<pre><code>SELECT ROUND(-123.456);<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de<strong>-123<\/strong>\uff0c\u8ca0\u6578\u7684\u56db\u820d\u4e94\u5165\u9075\u5faa\u76f8\u540c\u7684\u898f\u5247\u3002<\/p>\n<h2 id=\"round%e5%87%bd%e6%95%b8%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-VubcIjSHas\">ROUND()\u51fd\u6578\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>ROUND()\u51fd\u6578\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\uff1a<\/p>\n<ul>\n<li><strong>\u8ca1\u52d9\u5831\u544a<\/strong>: \u5728\u8655\u7406\u91d1\u984d\u6642\uff0c\u901a\u5e38\u9700\u8981\u5c07\u6578\u5b57\u56db\u820d\u4e94\u5165\u5230\u5c0f\u6578\u9ede\u5f8c\u5169\u4f4d\uff0c\u4ee5\u4fbf\u65bc\u5831\u544a\u548c\u8a08\u7b97\u3002<\/li>\n<li><strong>\u7d71\u8a08\u5206\u6790<\/strong>: \u5728\u9032\u884c\u6578\u64da\u5206\u6790\u6642\uff0c\u56db\u820d\u4e94\u5165\u53ef\u4ee5\u5e6b\u52a9\u7c21\u5316\u6578\u64da\uff0c\u8b93\u7d50\u679c\u66f4\u6613\u65bc\u7406\u89e3\u3002<\/li>\n<li><strong>\u6578\u64da\u6e05\u7406<\/strong>: \u5728\u6578\u64da\u6e05\u7406\u904e\u7a0b\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u5c07\u4e0d\u5fc5\u8981\u7684\u5c0f\u6578\u4f4d\u53bb\u9664\uff0c\u4ee5\u63d0\u9ad8\u6578\u64da\u7684\u6574\u9ad4\u8cea\u91cf\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-VubcIjSHas\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528ROUND()\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>ROUND()\u51fd\u6578\u7684\u884c\u70ba\u53ef\u80fd\u6703\u53d7\u5230\u6578\u64da\u985e\u578b\u7684\u5f71\u97ff\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u6d6e\u9ede\u6578\u6642\u3002<\/li>\n<li>\u5982\u679c\u5c0f\u6578\u4f4d\u6578\u70ba\u8ca0\uff0c\u5247ROUND()\u5c07\u5c0d\u6574\u6578\u90e8\u5206\u9032\u884c\u56db\u820d\u4e94\u5165\u3002\u4f8b\u5982\uff0c<code>ROUND(123.456, -1)<\/code>\u5c07\u8fd4\u56de<strong>120<\/strong>\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-VubcIjSHas\">\u7d50\u8ad6<\/h2>\n<p>MySQL\u7684ROUND()\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\u6709\u6548\u7684\u56db\u820d\u4e94\u5165\u3002\u7121\u8ad6\u662f\u5728\u8ca1\u52d9\u5831\u544a\u3001\u7d71\u8a08\u5206\u6790\u9084\u662f\u6578\u64da\u6e05\u7406\u4e2d\uff0c\u9019\u500b\u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u91cd\u8981\u7684\u652f\u6301\u3002\u4e86\u89e3\u5982\u4f55\u6b63\u78ba\u4f7f\u7528ROUND()\u51fd\u6578\uff0c\u5c07\u6709\u52a9\u65bc\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6e96\u78ba\u6027\u548c\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\uff0c\u7279\u5225\u662f\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">VPS<\/a> \u670d\u52d9\uff0c\u70ba\u60a8\u7684\u9805\u76ee\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684ROUND()\u51fd\u6570\uff0c\u638c\u63e1\u5982\u4f55\u8fdb\u884c\u56db\u820d\u4e94\u5165\u64cd\u4f5c\uff0c\u63d0\u5347\u6570\u636e\u5904\u7406\u7cbe\u5ea6\u4e0e\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-79628","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79628","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=79628"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79628\/revisions"}],"predecessor-version":[{"id":79629,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79628\/revisions\/79629"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79628"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79628"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}