{"id":78270,"date":"2024-10-16T11:42:19","date_gmt":"2024-10-16T03:42:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78270\/"},"modified":"2024-10-16T11:42:19","modified_gmt":"2024-10-16T03:42:19","slug":"mysql%e6%8c%87%e4%bb%a4-dec%ef%bc%88%e5%b0%8f%e6%95%b8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78270\/","title":{"rendered":"MySQL\u6307\u4ee4: DEC\uff08\u5c0f\u6578\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-dec%ef%bc%88%e5%b0%8f%e6%95%b8%ef%bc%89-tUzueLtRXE\">MySQL\u6307\u4ee4: DEC\uff08\u5c0f\u6578\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u958b\u6e90\u8cc7\u6599\u5eab\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u985e\u578b\u4ee5\u6eff\u8db3\u4e0d\u540c\u7684\u9700\u6c42\u3002\u5176\u4e2d\uff0cDEC\uff08\u6216DECIMAL\uff09\u6578\u64da\u985e\u578b\u5c08\u9580\u7528\u65bc\u5b58\u5132\u7cbe\u78ba\u7684\u5c0f\u6578\u503c\uff0c\u9019\u5c0d\u65bc\u91d1\u878d\u8a08\u7b97\u548c\u5176\u4ed6\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u61c9\u7528\u7279\u5225\u91cd\u8981\u3002<\/p>\n<h2 id=\"decimal%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%9a%84%e5%ae%9a%e7%be%a9-tUzueLtRXE\">DECIMAL\u6578\u64da\u985e\u578b\u7684\u5b9a\u7fa9<\/h2>\n<p>DECIMAL\u6578\u64da\u985e\u578b\u5141\u8a31\u7528\u6236\u5b9a\u7fa9\u5c0f\u6578\u7684\u7cbe\u5ea6\u548c\u7bc4\u570d\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DECIMAL(M, D)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<strong>M<\/strong>\u8868\u793a\u6578\u5b57\u7684\u7e3d\u4f4d\u6578\uff08\u5373\u6574\u6578\u4f4d\u548c\u5c0f\u6578\u4f4d\u7684\u7e3d\u548c\uff09\uff0c\u800c<strong>D<\/strong>\u5247\u8868\u793a\u5c0f\u6578\u4f4d\u7684\u4f4d\u6578\u3002\u8209\u4f8b\u4f86\u8aaa\uff0c<code>DECIMAL(5, 2)<\/code>\u53ef\u4ee5\u5b58\u5132\u7684\u6578\u5b57\u7bc4\u570d\u662f\u5f9e-999.99\u5230999.99\uff0c\u4e26\u4e14\u5c0f\u6578\u9ede\u5f8c\u6709\u5169\u4f4d\u6578\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8decimal%e7%9a%84%e5%84%aa%e5%8b%a2-tUzueLtRXE\">\u4f7f\u7528DECIMAL\u7684\u512a\u52e2<\/h2>\n<ul>\n<li><strong>\u7cbe\u78ba\u6027\uff1a<\/strong>DECIMAL\u6578\u64da\u985e\u578b\u80fd\u5920\u907f\u514d\u6d6e\u9ede\u6578\u8a08\u7b97\u4e2d\u5e38\u898b\u7684\u7cbe\u5ea6\u554f\u984c\uff0c\u9019\u5c0d\u65bc\u91d1\u878d\u61c9\u7528\u5c24\u70ba\u91cd\u8981\u3002<\/li>\n<li><strong>\u9748\u6d3b\u6027\uff1a<\/strong>\u7528\u6236\u53ef\u4ee5\u6839\u64da\u9700\u6c42\u81ea\u5b9a\u7fa9\u7cbe\u5ea6\u548c\u7bc4\u570d\uff0c\u9019\u4f7f\u5f97DECIMAL\u975e\u5e38\u9748\u6d3b\u3002<\/li>\n<li><strong>\u517c\u5bb9\u6027\uff1a<\/strong>DECIMAL\u6578\u64da\u985e\u578b\u8207\u5176\u4ed6\u6578\u64da\u985e\u578b\uff08\u5982\u6574\u6578\u548c\u6d6e\u9ede\u6578\uff09\u517c\u5bb9\uff0c\u4fbf\u65bc\u9032\u884c\u6578\u64da\u8f49\u63db\u548c\u8a08\u7b97\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e4%bd%bf%e7%94%a8decimal-tUzueLtRXE\">\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528DECIMAL<\/h2>\n<p>\u5728MySQL\u4e2d\u5275\u5efa\u4e00\u500b\u5305\u542bDECIMAL\u6578\u64da\u985e\u578b\u7684\u8868\u683c\u975e\u5e38\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\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\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba<code>products<\/code>\u7684\u8868\u683c\uff0c\u5176\u4e2d\u5305\u542b\u4e09\u500b\u6b04\u4f4d\uff1a<code>id<\/code>\u3001<code>name<\/code>\u548c<code>price<\/code>\u3002<code>price<\/code>\u6b04\u4f4d\u4f7f\u7528\u4e86<code>DECIMAL(10, 2)<\/code>\uff0c\u9019\u610f\u5473\u8457\u5b83\u53ef\u4ee5\u5b58\u5132\u6700\u591a10\u4f4d\u6578\u5b57\uff0c\u5176\u4e2d2\u4f4d\u662f\u5c0f\u6578\u3002<\/p>\n<h2 id=\"%e6%8f%92%e5%85%a5%e5%92%8c%e6%9f%a5%e8%a9%a2decimal%e6%95%b8%e6%93%9a-tUzueLtRXE\">\u63d2\u5165\u548c\u67e5\u8a62DECIMAL\u6578\u64da<\/h2>\n<p>\u63d2\u5165DECIMAL\u6578\u64da\u7684\u8a9e\u6cd5\u8207\u5176\u4ed6\u6578\u64da\u985e\u578b\u76f8\u540c\uff1a<\/p>\n<pre><code>INSERT INTO products (name, price) VALUES ('Product A', 19.99);<\/code><\/pre>\n<p>\u67e5\u8a62DECIMAL\u6578\u64da\u4e5f\u5f88\u7c21\u55ae\uff1a<\/p>\n<pre><code>SELECT * FROM products WHERE price &gt; 10.00;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u50f9\u683c\u5927\u65bc10.00\u7684\u7522\u54c1\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-tUzueLtRXE\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528DECIMAL\u6578\u64da\u985e\u578b\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>DECIMAL\u7684\u5b58\u5132\u7a7a\u9593\u6703\u96a8\u8457M\u7684\u5927\u5c0f\u800c\u8b8a\u5316\uff0cM\u7684\u503c\u8d8a\u5927\uff0c\u6240\u9700\u7684\u5b58\u5132\u7a7a\u9593\u4e5f\u8d8a\u5927\u3002<\/li>\n<li>\u5728\u9032\u884c\u6578\u5b78\u904b\u7b97\u6642\uff0cDECIMAL\u985e\u578b\u7684\u8a08\u7b97\u901f\u5ea6\u53ef\u80fd\u6703\u6bd4\u6574\u6578\u548c\u6d6e\u9ede\u6578\u6162\u3002<\/li>\n<li>\u5728\u9032\u884c\u6bd4\u8f03\u6642\uff0cDECIMAL\u985e\u578b\u7684\u6578\u64da\u53ef\u80fd\u6703\u53d7\u5230\u5c0f\u6578\u9ede\u4f4d\u7f6e\u7684\u5f71\u97ff\uff0c\u56e0\u6b64\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\u9700\u8b39\u614e\u8003\u616e\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-tUzueLtRXE\">\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\u5c0f\u6578\u8a08\u7b97\u7684\u61c9\u7528\u3002\u901a\u904e\u9748\u6d3b\u7684\u5b9a\u7fa9\u548c\u7cbe\u78ba\u7684\u5b58\u5132\uff0cDECIMAL\u80fd\u5920\u6709\u6548\u5730\u6eff\u8db3\u5404\u7a2e\u9700\u6c42\u3002\u5c0d\u65bc\u5e0c\u671b\u5728\u9999\u6e2f\u5c0b\u627e\u9ad8\u6548\u80fd\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u7684\u7528\u6236\uff0c\u4e86\u89e3\u5982\u4f55\u4f7f\u7528DECIMAL\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u61c9\u7528\u7684\u7a69\u5b9a\u6027\u548c\u6e96\u78ba\u6027\u3002\u82e5\u60a8\u5c0d\u65bc<code>VPS<\/code>\u3001<code>\u9999\u6e2fvps<\/code>\u6216\u5176\u4ed6<code>\u4e91\u670d\u52a1\u5668<\/code>\u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a> \u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684DEC\u6307\u4ee4\uff0c\u5982\u4f55\u4f7f\u7528\u5c0f\u6578\u985e\u578b\u5b58\u5132\u7cbe\u78ba\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u6e96\u78ba\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-78270","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78270","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=78270"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78270\/revisions"}],"predecessor-version":[{"id":78271,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78270\/revisions\/78271"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78270"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78270"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78270"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}