{"id":172513,"date":"2024-11-07T13:45:19","date_gmt":"2024-11-07T05:45:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172513\/"},"modified":"2024-11-07T13:45:20","modified_gmt":"2024-11-07T05:45:20","slug":"%e5%a6%82%e4%bd%95%e9%81%bf%e5%85%8d%e6%95%b8%e6%93%9a%e5%ba%abfloat%e9%a1%9e%e5%9e%8b%e9%80%a0%e6%88%90%e7%9a%84%e7%b2%be%e5%ba%a6%e5%95%8f%e9%a1%8c%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%abfloat","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172513\/","title":{"rendered":"\u5982\u4f55\u907f\u514d\u6578\u64da\u5eabfloat\u985e\u578b\u9020\u6210\u7684\u7cbe\u5ea6\u554f\u984c\uff1f (\u6578\u64da\u5eabfloat \u4e0d\u8a2d\u7f6e)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e9%81%bf%e5%85%8d%e6%95%b8%e6%93%9a%e5%ba%abfloat%e9%a1%9e%e5%9e%8b%e9%80%a0%e6%88%90%e7%9a%84%e7%b2%be%e5%ba%a6%e5%95%8f%e9%a1%8c%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%abfloat-ZUjMkCTpKa\">\u5982\u4f55\u907f\u514d\u6578\u64da\u5eabfloat\u985e\u578b\u9020\u6210\u7684\u7cbe\u5ea6\u554f\u984c\uff1f (\u6578\u64da\u5eabfloat \u4e0d\u8a2d\u7f6e)<\/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\u5b8c\u6574\u6027\u81f3\u95dc\u91cd\u8981\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u6d6e\u9ede\u6578\u64da\u6642\uff0c\u4f7f\u7528 <code>FLOAT<\/code> \u985e\u578b\u53ef\u80fd\u6703\u5c0e\u81f4\u7cbe\u5ea6\u554f\u984c\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u63a2\u8a0e\u5982\u4f55\u907f\u514d\u9019\u4e9b\u554f\u984c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u548c\u66ff\u4ee3\u65b9\u6848\u3002<\/p>\n<h2 id=\"float%e9%a1%9e%e5%9e%8b%e7%9a%84%e7%89%b9%e6%80%a7-ZUjMkCTpKa\">FLOAT\u985e\u578b\u7684\u7279\u6027<\/h2>\n<p><code>FLOAT<\/code> \u985e\u578b\u662f\u4e00\u7a2e\u7528\u65bc\u5b58\u5132\u6d6e\u9ede\u6578\u7684\u6578\u64da\u985e\u578b\uff0c\u901a\u5e38\u7528\u65bc\u9700\u8981\u8868\u793a\u5c0f\u6578\u7684\u60c5\u6cc1\u3002\u7136\u800c\uff0c<code>FLOAT<\/code> \u7684\u8868\u793a\u65b9\u5f0f\u662f\u57fa\u65bc\u4e8c\u9032\u5236\u7684\uff0c\u9019\u53ef\u80fd\u5c0e\u81f4\u67d0\u4e9b\u5341\u9032\u5236\u6578\u5b57\u7121\u6cd5\u7cbe\u78ba\u8868\u793a\u3002\u4f8b\u5982\uff0c0.1 \u548c 0.2 \u5728\u4e8c\u9032\u5236\u4e2d\u7121\u6cd5\u7cbe\u78ba\u8868\u793a\uff0c\u9019\u6703\u5c0e\u81f4\u8a08\u7b97\u7d50\u679c\u51fa\u73fe\u8aa4\u5dee\u3002<\/p>\n<h2 id=\"%e7%b2%be%e5%ba%a6%e5%95%8f%e9%a1%8c%e7%9a%84%e5%bd%b1%e9%9f%bf-ZUjMkCTpKa\">\u7cbe\u5ea6\u554f\u984c\u7684\u5f71\u97ff<\/h2>\n<p>\u7576\u4f7f\u7528 <code>FLOAT<\/code> \u985e\u578b\u6642\uff0c\u53ef\u80fd\u6703\u51fa\u73fe\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li><strong>\u8a08\u7b97\u8aa4\u5dee\uff1a<\/strong>\u5728\u9032\u884c\u6578\u5b78\u904b\u7b97\u6642\uff0c\u6d6e\u9ede\u6578\u7684\u7cbe\u5ea6\u554f\u984c\u53ef\u80fd\u5c0e\u81f4\u6700\u7d42\u7d50\u679c\u4e0d\u6e96\u78ba\u3002<\/li>\n<li><strong>\u6578\u64da\u4e0d\u4e00\u81f4\uff1a<\/strong>\u5982\u679c\u4e0d\u540c\u7684\u7cfb\u7d71\u6216\u61c9\u7528\u7a0b\u5e8f\u4f7f\u7528\u4e0d\u540c\u7684\u6d6e\u9ede\u6578\u8868\u793a\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u3002<\/li>\n<li><strong>\u96e3\u4ee5\u8abf\u8a66\uff1a<\/strong>\u7531\u65bc\u6d6e\u9ede\u6578\u7684\u7cbe\u5ea6\u554f\u984c\uff0c\u8abf\u8a66\u8a08\u7b97\u932f\u8aa4\u53ef\u80fd\u8b8a\u5f97\u66f4\u52a0\u56f0\u96e3\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%81%bf%e5%85%8dfloat%e9%a1%9e%e5%9e%8b%e7%b2%be%e5%ba%a6%e5%95%8f%e9%a1%8c%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-ZUjMkCTpKa\">\u907f\u514dFLOAT\u985e\u578b\u7cbe\u5ea6\u554f\u984c\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8decimal%e9%a1%9e%e5%9e%8b-ZUjMkCTpKa\">1. \u4f7f\u7528DECIMAL\u985e\u578b<\/h3>\n<p>\u5c0d\u65bc\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u6578\u64da\uff0c\u5efa\u8b70\u4f7f\u7528 <code>DECIMAL<\/code> \u985e\u578b\u3002<code>DECIMAL<\/code> \u662f\u4e00\u7a2e\u5b9a\u9ede\u6578\u64da\u985e\u578b\uff0c\u53ef\u4ee5\u7cbe\u78ba\u8868\u793a\u5341\u9032\u5236\u6578\u5b57\uff0c\u907f\u514d\u4e86\u6d6e\u9ede\u6578\u7684\u7cbe\u5ea6\u554f\u984c\u3002\u4f7f\u7528 <code>DECIMAL<\/code> \u6642\uff0c\u53ef\u4ee5\u6307\u5b9a\u7e3d\u4f4d\u6578\u548c\u5c0f\u6578\u4f4d\u6578\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE TABLE products (\n    id INT PRIMARY KEY,\n    price DECIMAL(10, 2)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>price<\/code> \u6b04\u4f4d\u53ef\u4ee5\u5b58\u5132\u6700\u591a 10 \u4f4d\u6578\u5b57\uff0c\u5176\u4e2d 2 \u4f4d\u662f\u5c0f\u6578\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u50f9\u683c\u7684\u6e96\u78ba\u6027\u3002<\/p>\n<h3 id=\"2-%e9%81%bf%e5%85%8d%e4%b8%8d%e5%bf%85%e8%a6%81%e7%9a%84%e6%b5%ae%e9%bb%9e%e9%81%8b%e7%ae%97-ZUjMkCTpKa\">2. \u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6d6e\u9ede\u904b\u7b97<\/h3>\n<p>\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u6642\uff0c\u61c9\u76e1\u91cf\u907f\u514d\u4f7f\u7528\u6d6e\u9ede\u6578\u9032\u884c\u8a08\u7b97\u3002\u5982\u679c\u53ef\u4ee5\uff0c\u5c07\u6240\u6709\u8a08\u7b97\u8f49\u63db\u70ba\u6574\u6578\u904b\u7b97\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u91d1\u984d\u7684\u8a08\u7b97\uff0c\u53ef\u4ee5\u5c07\u91d1\u984d\u4ee5\u5206\u70ba\u55ae\u4f4d\u5b58\u5132\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u6d6e\u9ede\u6578\u7684\u4f7f\u7528\u3002<\/p>\n<pre><code>-- \u5c07\u91d1\u984d\u4ee5\u5206\u70ba\u55ae\u4f4d\u5b58\u5132\nCREATE TABLE transactions (\n    id INT PRIMARY KEY,\n    amount INT -- \u5b58\u5132\u4ee5\u5206\u70ba\u55ae\u4f4d\u7684\u91d1\u984d\n);<\/code><\/pre>\n<h3 id=\"3-%e5%ae%9a%e6%9c%9f%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a-ZUjMkCTpKa\">3. \u5b9a\u671f\u6aa2\u67e5\u6578\u64da<\/h3>\n<p>\u5b9a\u671f\u6aa2\u67e5\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u53ef\u4ee5\u901a\u904e\u7de8\u5beb\u6e2c\u8a66\u7528\u4f8b\u6216\u4f7f\u7528\u6578\u64da\u9a57\u8b49\u5de5\u5177\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u6b63\u78ba\u6027\u3002\u9019\u6a23\u53ef\u4ee5\u53ca\u65e9\u767c\u73fe\u4e26\u4fee\u6b63\u56e0\u6d6e\u9ede\u6578\u7cbe\u5ea6\u554f\u984c\u800c\u5c0e\u81f4\u7684\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-ZUjMkCTpKa\">\u7d50\u8ad6<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u5c0d\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u81f3\u95dc\u91cd\u8981\u3002\u96d6\u7136 <code>FLOAT<\/code> \u985e\u578b\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u662f\u5408\u9069\u7684\u9078\u64c7\uff0c\u4f46\u5728\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528 <code>DECIMAL<\/code> \u985e\u578b\u662f\u66f4\u597d\u7684\u9078\u64c7\u3002\u6b64\u5916\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6d6e\u9ede\u904b\u7b97\u548c\u5b9a\u671f\u6aa2\u67e5\u6578\u64da\u4e5f\u80fd\u6709\u6548\u6e1b\u5c11\u7cbe\u5ea6\u554f\u984c\u7684\u5f71\u97ff\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u670d\u52d9\u80fd\u5920\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u8207\u6e96\u78ba\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u907f\u514d\u6578\u64da\u5eab\u4e2dfloat\u985e\u578b\u7684\u7cbe\u5ea6\u554f\u984c\uff0c\u63a2\u7d22\u6700\u4f73\u5be6\u8e10\u548c\u66ff\u4ee3\u65b9\u6848\uff0c\u78ba\u4fdd\u6578\u64da\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-172513","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172513","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=172513"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172513\/revisions"}],"predecessor-version":[{"id":172514,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172513\/revisions\/172514"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172513"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172513"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172513"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}