{"id":76754,"date":"2024-10-16T09:34:18","date_gmt":"2024-10-16T01:34:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76754\/"},"modified":"2024-10-16T09:34:18","modified_gmt":"2024-10-16T01:34:18","slug":"mysql%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e4%b8%addecimal%e7%9a%84%e4%bd%9c%e7%94%a8%e5%92%8c%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76754\/","title":{"rendered":"MySQL\u6578\u64da\u985e\u578b\u4e2dDECIMAL\u7684\u4f5c\u7528\u548c\u7528\u6cd5"},"content":{"rendered":"<h1 id=\"mysql%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e4%b8%addecimal%e7%9a%84%e4%bd%9c%e7%94%a8%e5%92%8c%e7%94%a8%e6%b3%95-UaKjHRuyFS\">MySQL\u6578\u64da\u985e\u578b\u4e2dDECIMAL\u7684\u4f5c\u7528\u548c\u7528\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u5c0d\u65bc\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u5176\u4e2dDECIMAL\u985e\u578b\u7279\u5225\u9069\u5408\u7528\u65bc\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u6578\u503c\u8a08\u7b97\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2dDECIMAL\u6578\u64da\u985e\u578b\u7684\u4f5c\u7528\u548c\u7528\u6cd5\u3002<\/p>\n<h2 id=\"decimal%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e6%a6%82%e8%bf%b0-UaKjHRuyFS\">DECIMAL\u6578\u64da\u985e\u578b\u6982\u8ff0<\/h2>\n<p>DECIMAL\u6578\u64da\u985e\u578b\u662f\u4e00\u7a2e\u7cbe\u78ba\u7684\u6578\u503c\u6578\u64da\u985e\u578b\uff0c\u4e3b\u8981\u7528\u65bc\u5b58\u5132\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u6578\u5b57\uff0c\u4f8b\u5982\u91d1\u984d\u3001\u5229\u7387\u7b49\u3002\u8207\u6d6e\u9ede\u6578\u985e\u578b\uff08\u5982FLOAT\u548cDOUBLE\uff09\u4e0d\u540c\uff0cDECIMAL\u80fd\u5920\u907f\u514d\u56e0\u70ba\u6d6e\u9ede\u904b\u7b97\u800c\u5c0e\u81f4\u7684\u7cbe\u5ea6\u640d\u5931\u3002<\/p>\n<h2 id=\"decimal%e7%9a%84%e8%aa%9e%e6%b3%95-UaKjHRuyFS\">DECIMAL\u7684\u8a9e\u6cd5<\/h2>\n<p>\u5728MySQL\u4e2d\uff0cDECIMAL\u6578\u64da\u985e\u578b\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DECIMAL(M, D)<\/code><\/pre>\n<ul>\n<li><strong>M<\/strong>\uff1a\u8868\u793a\u6578\u5b57\u7684\u7e3d\u4f4d\u6578\uff08\u5373\u6578\u5b57\u7684\u9577\u5ea6\uff09\uff0c\u7bc4\u570d\u5f9e1\u523065\u3002<\/li>\n<li><strong>D<\/strong>\uff1a\u8868\u793a\u5c0f\u6578\u9ede\u5f8c\u7684\u4f4d\u6578\uff0c\u7bc4\u570d\u5f9e0\u523030\uff0c\u4e14\u5fc5\u9808\u5c0f\u65bc\u6216\u7b49\u65bcM\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c<code>DECIMAL(10, 2)<\/code>\u8868\u793a\u9019\u500b\u6578\u5b57\u6700\u591a\u53ef\u4ee5\u670910\u4f4d\u6578\uff0c\u5176\u4e2d2\u4f4d\u662f\u5c0f\u6578\u4f4d\u3002\u9019\u610f\u5473\u8457\u53ef\u4ee5\u5b58\u5132\u7684\u6578\u5b57\u7bc4\u570d\u662f-99999999.99\u523099999999.99\u3002<\/p>\n<h2 id=\"decimal%e7%9a%84%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-UaKjHRuyFS\">DECIMAL\u7684\u4f7f\u7528\u5834\u666f<\/h2>\n<p>DECIMAL\u6578\u64da\u985e\u578b\u7279\u5225\u9069\u5408\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li><strong>\u91d1\u878d\u8a08\u7b97<\/strong>\uff1a\u5728\u91d1\u878d\u61c9\u7528\u4e2d\uff0c\u91d1\u984d\u7684\u8a08\u7b97\u9700\u8981\u9ad8\u7cbe\u5ea6\uff0c\u4f7f\u7528DECIMAL\u53ef\u4ee5\u907f\u514d\u56e0\u6d6e\u9ede\u6578\u8a08\u7b97\u800c\u5c0e\u81f4\u7684\u8aa4\u5dee\u3002<\/li>\n<li><strong>\u79d1\u5b78\u8a08\u7b97<\/strong>\uff1a\u67d0\u4e9b\u79d1\u5b78\u8a08\u7b97\u9700\u8981\u7cbe\u78ba\u7684\u6578\u503c\u8868\u793a\uff0cDECIMAL\u80fd\u5920\u63d0\u4f9b\u6240\u9700\u7684\u7cbe\u5ea6\u3002<\/li>\n<li><strong>\u5831\u8868\u751f\u6210<\/strong>\uff1a\u5728\u751f\u6210\u5831\u8868\u6642\uff0c\u6578\u64da\u7684\u6e96\u78ba\u6027\u81f3\u95dc\u91cd\u8981\uff0c\u4f7f\u7528DECIMAL\u53ef\u4ee5\u78ba\u4fdd\u5831\u8868\u4e2d\u7684\u6578\u64da\u4e0d\u6703\u56e0\u70ba\u7cbe\u5ea6\u554f\u984c\u800c\u51fa\u932f\u3002<\/li>\n<\/ul>\n<h2 id=\"decimal%e7%9a%84%e7%a4%ba%e4%be%8b-UaKjHRuyFS\">DECIMAL\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528DECIMAL\u6578\u64da\u985e\u578b\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE products (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    name VARCHAR(100),\n    price DECIMAL(10, 2)\n);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70baproducts\u7684\u8868\uff0c\u5176\u4e2dprice\u5b57\u6bb5\u4f7f\u7528\u4e86DECIMAL(10, 2)\u985e\u578b\uff0c\u9019\u610f\u5473\u8457\u6bcf\u500b\u7522\u54c1\u7684\u50f9\u683c\u53ef\u4ee5\u7cbe\u78ba\u5230\u5c0f\u6578\u9ede\u5f8c\u5169\u4f4d\u3002<\/p>\n<h2 id=\"decimal%e7%9a%84%e5%84%aa%e7%bc%ba%e9%bb%9e-UaKjHRuyFS\">DECIMAL\u7684\u512a\u7f3a\u9ede<\/h2>\n<h3 id=\"%e5%84%aa%e9%bb%9e-UaKjHRuyFS\">\u512a\u9ede<\/h3>\n<ul>\n<li>\u9ad8\u7cbe\u5ea6\uff1aDECIMAL\u80fd\u5920\u63d0\u4f9b\u6bd4\u6d6e\u9ede\u6578\u66f4\u9ad8\u7684\u7cbe\u5ea6\uff0c\u9069\u5408\u9700\u8981\u7cbe\u78ba\u8a08\u7b97\u7684\u5834\u666f\u3002<\/li>\n<li>\u907f\u514d\u7cbe\u5ea6\u640d\u5931\uff1a\u5728\u9032\u884c\u6578\u5b78\u904b\u7b97\u6642\uff0cDECIMAL\u4e0d\u6703\u51fa\u73fe\u6d6e\u9ede\u6578\u7684\u7cbe\u5ea6\u640d\u5931\u554f\u984c\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%bc%ba%e9%bb%9e-UaKjHRuyFS\">\u7f3a\u9ede<\/h3>\n<ul>\n<li>\u6027\u80fd\uff1a\u7531\u65bcDECIMAL\u9700\u8981\u66f4\u591a\u7684\u5b58\u5132\u7a7a\u9593\u548c\u8a08\u7b97\u8cc7\u6e90\uff0c\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/li>\n<li>\u5b58\u5132\u7a7a\u9593\uff1aDECIMAL\u985e\u578b\u7684\u5b58\u5132\u7a7a\u9593\u6bd4\u6574\u6578\u985e\u578b\u8981\u5927\uff0c\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u6703\u5c0e\u81f4\u5b58\u5132\u6548\u7387\u964d\u4f4e\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-UaKjHRuyFS\">\u7e3d\u7d50<\/h2>\n<p>\u5728MySQL\u4e2d\uff0cDECIMAL\u6578\u64da\u985e\u578b\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u9069\u5408\u7528\u65bc\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u6578\u503c\u8a08\u7b97\u3002\u7121\u8ad6\u662f\u5728\u91d1\u878d\u3001\u79d1\u5b78\u9084\u662f\u5831\u8868\u751f\u6210\u7b49\u9818\u57df\uff0cDECIMAL\u90fd\u80fd\u5920\u63d0\u4f9b\u6e96\u78ba\u7684\u6578\u64da\u8868\u793a\u3002\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6e96\u78ba\u6027\u81f3\u95dc\u91cd\u8981\uff0c\u56e0\u6b64\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u61c9\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\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\u60a8\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\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2dDECIMAL\u6578\u64da\u985e\u578b\u7684\u4f5c\u7528\u548c\u7528\u6cd5\uff0c\u78ba\u4fdd\u7cbe\u78ba\u5b58\u5132\u6578\u5b57\uff0c\u9069\u7528\u65bc\u8ca1\u52d9\u8a08\u7b97\u548c\u9ad8\u7cbe\u5ea6\u9700\u6c42\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-76754","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76754","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=76754"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76754\/revisions"}],"predecessor-version":[{"id":76755,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76754\/revisions\/76755"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76754"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76754"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76754"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}