{"id":76768,"date":"2024-10-16T09:46:17","date_gmt":"2024-10-16T01:46:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76768\/"},"modified":"2024-10-16T09:46:17","modified_gmt":"2024-10-16T01:46:17","slug":"mysql%e5%9b%9b%e6%8d%a8%e4%ba%94%e5%85%a5%e7%9a%84%e5%af%a6%e7%8f%be","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76768\/","title":{"rendered":"MySQL\u56db\u6368\u4e94\u5165\u7684\u5be6\u73fe"},"content":{"rendered":"<h1 id=\"mysql%e5%9b%9b%e6%8d%a8%e4%ba%94%e5%85%a5%e7%9a%84%e5%af%a6%e7%8f%be-ABxEduCHwb\">MySQL\u56db\u6368\u4e94\u5165\u7684\u5be6\u73fe<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u7cbe\u78ba\u6027\u81f3\u95dc\u91cd\u8981\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u8655\u7406\u529f\u80fd\uff0c\u5176\u4e2d\u5305\u62ec\u6578\u5b57\u7684\u56db\u6368\u4e94\u5165\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u56db\u6368\u4e94\u5165\u7684\u5be6\u73fe\u65b9\u5f0f\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e5%9b%9b%e6%8d%a8%e4%ba%94%e5%85%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-ABxEduCHwb\">\u56db\u6368\u4e94\u5165\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u56db\u6368\u4e94\u5165\u662f\u4e00\u7a2e\u6578\u5b78\u904b\u7b97\uff0c\u7528\u65bc\u5c07\u6578\u5b57\u8f49\u63db\u70ba\u6700\u63a5\u8fd1\u7684\u6574\u6578\u6216\u6307\u5b9a\u7684\u5c0f\u6578\u4f4d\u6578\u3002\u9019\u5728\u8ca1\u52d9\u8a08\u7b97\u3001\u7d71\u8a08\u5206\u6790\u7b49\u9818\u57df\u4e2d\u975e\u5e38\u5e38\u898b\u3002MySQL\u63d0\u4f9b\u4e86\u5e7e\u7a2e\u51fd\u6578\u4f86\u5be6\u73fe\u56db\u6368\u4e94\u5165\uff0c\u6700\u5e38\u7528\u7684\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>ROUND()<\/code><\/li>\n<li><code>CEIL()<\/code><\/li>\n<li><code>FLOOR()<\/code><\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8round%e5%87%bd%e6%95%b8-ABxEduCHwb\">\u4f7f\u7528ROUND()\u51fd\u6578<\/h2>\n<p><code>ROUND()<\/code>\u51fd\u6578\u662fMySQL\u4e2d\u6700\u5e38\u7528\u7684\u56db\u6368\u4e94\u5165\u51fd\u6578\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ROUND(number, decimals)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>number<\/code>\u662f\u8981\u9032\u884c\u56db\u6368\u4e94\u5165\u7684\u6578\u5b57\uff0c<code>decimals<\/code>\u662f\u8981\u4fdd\u7559\u7684\u5c0f\u6578\u4f4d\u6578\u3002\u5982\u679c<code>decimals<\/code>\u7701\u7565\uff0c\u5247\u9ed8\u8a8d\u70ba0\uff0c\u8868\u793a\u56db\u6368\u4e94\u5165\u5230\u6574\u6578\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-ABxEduCHwb\">\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4f7f\u7528<code>ROUND()<\/code>\u51fd\u6578\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT ROUND(123.4567, 2);  -- \u7d50\u679c\u70ba 123.46\nSELECT ROUND(123.4567);        -- \u7d50\u679c\u70ba 123\nSELECT ROUND(123.4567, 0);     -- \u7d50\u679c\u70ba 123\nSELECT ROUND(123.5567, 2);      -- \u7d50\u679c\u70ba 123.56\n<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8ceil%e5%92%8cfloor%e5%87%bd%e6%95%b8-ABxEduCHwb\">\u4f7f\u7528CEIL()\u548cFLOOR()\u51fd\u6578<\/h2>\n<p>\u9664\u4e86<code>ROUND()<\/code>\u51fd\u6578\uff0cMySQL\u9084\u63d0\u4f9b\u4e86<code>CEIL()<\/code>\u548c<code>FLOOR()<\/code>\u51fd\u6578\uff0c\u9019\u5169\u500b\u51fd\u6578\u5206\u5225\u7528\u65bc\u5411\u4e0a\u53d6\u6574\u548c\u5411\u4e0b\u53d6\u6574\u3002<\/p>\n<h3 id=\"ceil%e5%87%bd%e6%95%b8-ABxEduCHwb\">CEIL()\u51fd\u6578<\/h3>\n<p><code>CEIL()<\/code>\u51fd\u6578\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CEIL(number)<\/code><\/pre>\n<p>\u9019\u500b\u51fd\u6578\u5c07\u6578\u5b57\u5411\u4e0a\u53d6\u6574\u5230\u6700\u63a5\u8fd1\u7684\u6574\u6578\u3002<\/p>\n<h4 id=\"%e7%a4%ba%e4%be%8b-ABxEduCHwb\">\u793a\u4f8b<\/h4>\n<pre><code>SELECT CEIL(123.4567);  -- \u7d50\u679c\u70ba 124\nSELECT CEIL(-123.4567);   -- \u7d50\u679c\u70ba -123\n<\/code><\/pre>\n<h3 id=\"floor%e5%87%bd%e6%95%b8-ABxEduCHwb\">FLOOR()\u51fd\u6578<\/h3>\n<p><code>FLOOR()<\/code>\u51fd\u6578\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>FLOOR(number)<\/code><\/pre>\n<p>\u9019\u500b\u51fd\u6578\u5c07\u6578\u5b57\u5411\u4e0b\u53d6\u6574\u5230\u6700\u63a5\u8fd1\u7684\u6574\u6578\u3002<\/p>\n<h4 id=\"%e7%a4%ba%e4%be%8b-ABxEduCHwb\">\u793a\u4f8b<\/h4>\n<pre><code>SELECT FLOOR(123.4567);  -- \u7d50\u679c\u70ba 123\nSELECT FLOOR(-123.4567);   -- \u7d50\u679c\u70ba -124\n<\/code><\/pre>\n<h2 id=\"%e5%b0%8f%e6%95%b8%e4%bd%8d%e6%95%b8%e7%9a%84%e8%99%95%e7%90%86-ABxEduCHwb\">\u5c0f\u6578\u4f4d\u6578\u7684\u8655\u7406<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u5c0d\u5c0f\u6578\u4f4d\u6578\u9032\u884c\u66f4\u7cbe\u7d30\u7684\u63a7\u5236\u3002\u4f7f\u7528<code>ROUND()<\/code>\u51fd\u6578\u6642\uff0c\u53ef\u4ee5\u6307\u5b9a\u5c0f\u6578\u4f4d\u6578\uff0c\u9019\u5c0d\u65bc\u8ca1\u52d9\u5831\u8868\u7b49\u61c9\u7528\u5834\u666f\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-ABxEduCHwb\">\u793a\u4f8b<\/h3>\n<pre><code>SELECT ROUND(123.4567, 3);  -- \u7d50\u679c\u70ba 123.457\nSELECT ROUND(123.4444, 2);    -- \u7d50\u679c\u70ba 123.44\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ABxEduCHwb\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u5be6\u73fe\u6578\u5b57\u7684\u56db\u6368\u4e94\u5165\uff0c\u5305\u62ec<code>ROUND()<\/code>\u3001<code>CEIL()<\/code>\u548c<code>FLOOR()<\/code>\u3002\u9019\u4e9b\u51fd\u6578\u5728\u6578\u64da\u8655\u7406\u548c\u5206\u6790\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u7cbe\u78ba\u63a7\u5236\u6578\u5b57\u683c\u5f0f\u7684\u60c5\u6cc1\u4e0b\u3002\u4e86\u89e3\u9019\u4e9b\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u8655\u7406\u6578\u64da\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u7121\u8ad6\u662f\u9078\u64c7<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0cServer.HK\u90fd\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u56db\u6368\u4e94\u5165\u7684\u5be6\u73fe\u65b9\u6cd5\uff0c\u638c\u63e1ROUND\u51fd\u6578\u7684\u7528\u6cd5\u53ca\u5176\u5728\u6578\u64da\u8655\u7406\u4e2d\u7684\u61c9\u7528\u6280\u5de7\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-76768","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76768","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=76768"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76768\/revisions"}],"predecessor-version":[{"id":76769,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76768\/revisions\/76769"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76768"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76768"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76768"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}