{"id":78272,"date":"2024-10-16T11:43:15","date_gmt":"2024-10-16T03:43:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78272\/"},"modified":"2024-10-16T11:43:15","modified_gmt":"2024-10-16T03:43:15","slug":"mysql%e6%8c%87%e4%bb%a4-decimal%ef%bc%88%e5%b0%8f%e6%95%b8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78272\/","title":{"rendered":"MySQL\u6307\u4ee4: DECIMAL\uff08\u5c0f\u6578\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-decimal%ef%bc%88%e5%b0%8f%e6%95%b8%ef%bc%89-meekqukfYo\">MySQL\u6307\u4ee4: DECIMAL\uff08\u5c0f\u6578\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\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\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662fDECIMAL\uff08\u5c0f\u6578\uff09\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684DECIMAL\u6578\u64da\u985e\u578b\uff0c\u5305\u62ec\u5176\u7279\u6027\u3001\u4f7f\u7528\u5834\u666f\u53ca\u793a\u4f8b\u3002<\/p>\n<h2 id=\"decimal%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e6%a6%82%e8%bf%b0-meekqukfYo\">DECIMAL\u6578\u64da\u985e\u578b\u6982\u8ff0<\/h2>\n<p>DECIMAL\u6578\u64da\u985e\u578b\u7528\u65bc\u5b58\u5132\u7cbe\u78ba\u7684\u6578\u503c\uff0c\u7279\u5225\u9069\u5408\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u8a08\u7b97\uff0c\u5982\u8ca1\u52d9\u6578\u64da\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<h3 id=\"decimal%e7%9a%84%e8%aa%9e%e6%b3%95-meekqukfYo\">DECIMAL\u7684\u8a9e\u6cd5<\/h3>\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\u3002<\/li>\n<li><strong>D<\/strong>\uff1a\u8868\u793a\u5c0f\u6578\u9ede\u5f8c\u7684\u4f4d\u6578\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\u8a72\u6578\u5b57\u7684\u7bc4\u570d\u662f-99999999.99\u523099999999.99\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-meekqukfYo\">\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>\u8ca1\u52d9\u8a08\u7b97<\/strong>\uff1a\u5982\u91d1\u984d\u3001\u5229\u7387\u7b49\uff0c\u56e0\u70ba\u9019\u4e9b\u6578\u64da\u9700\u8981\u9ad8\u7cbe\u5ea6\u3002<\/li>\n<li><strong>\u79d1\u5b78\u8a08\u7b97<\/strong>\uff1a\u5728\u67d0\u4e9b\u79d1\u5b78\u61c9\u7528\u4e2d\uff0c\u7cbe\u78ba\u7684\u6578\u503c\u8868\u793a\u662f\u5fc5\u9700\u7684\u3002<\/li>\n<li><strong>\u7d71\u8a08\u6578\u64da<\/strong>\uff1a\u5728\u8655\u7406\u7d71\u8a08\u6578\u64da\u6642\uff0c\u907f\u514d\u6d6e\u9ede\u6578\u7684\u7cbe\u5ea6\u554f\u984c\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%a4%ba%e4%be%8b-meekqukfYo\">\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u5982\u4f55\u5728MySQL\u4e2d\u5275\u5efa\u4e00\u500b\u5305\u542bDECIMAL\u985e\u578b\u7684\u8868\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);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba<code>products<\/code>\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u500b<code>price<\/code>\u6b04\u4f4d\uff0c\u8a72\u6b04\u4f4d\u4f7f\u7528DECIMAL(10, 2)\u4f86\u5b58\u5132\u7522\u54c1\u7684\u50f9\u683c\u3002<\/p>\n<h3 id=\"%e6%8f%92%e5%85%a5%e6%95%b8%e6%93%9a-meekqukfYo\">\u63d2\u5165\u6578\u64da<\/h3>\n<p>\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u53ef\u4ee5\u63d2\u5165\u4e00\u4e9b\u6578\u64da\u5230\u9019\u500b\u8868\u4e2d\uff1a<\/p>\n<pre><code>INSERT INTO products (name, price) VALUES ('Product A', 19.99);\nINSERT INTO products (name, price) VALUES ('Product B', 29.95);<\/code><\/pre>\n<h3 id=\"%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a-meekqukfYo\">\u67e5\u8a62\u6578\u64da<\/h3>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u6aa2\u7d22\u6240\u6709\u7522\u54c1\u53ca\u5176\u50f9\u683c\uff1a<\/p>\n<pre><code>SELECT * FROM products;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6240\u6709\u7522\u54c1\u7684\u540d\u7a31\u548c\u50f9\u683c\uff0c\u4e26\u4e14\u50f9\u683c\u5c07\u4ee5\u5169\u4f4d\u5c0f\u6578\u7684\u5f62\u5f0f\u986f\u793a\uff0c\u78ba\u4fdd\u4e86\u6578\u64da\u7684\u6e96\u78ba\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-meekqukfYo\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u4e2d\u7684DECIMAL\u6578\u64da\u985e\u578b\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u7279\u5225\u9069\u5408\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u61c9\u7528\u5834\u666f\uff0c\u5982\u8ca1\u52d9\u548c\u79d1\u5b78\u8a08\u7b97\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528DECIMAL\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\uff0c\u907f\u514d\u6d6e\u9ede\u6578\u5e36\u4f86\u7684\u6f5b\u5728\u554f\u984c\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0c\u78ba\u4fdd\u9ad8\u6548\u548c\u5b89\u5168\u7684\u6578\u64da\u7ba1\u7406\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684DECIMAL\u6307\u4ee4\uff0c\u638c\u63e1\u5982\u4f55\u7cbe\u786e\u5b58\u50a8\u5c0f\u6570\u6570\u636e\uff0c\u786e\u4fdd\u6570\u503c\u8ba1\u7b97\u7684\u51c6\u786e\u6027\u4e0e\u7a33\u5b9a\u6027\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-78272","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78272","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=78272"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78272\/revisions"}],"predecessor-version":[{"id":78273,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78272\/revisions\/78273"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78272"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78272"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78272"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}