{"id":160729,"date":"2024-11-04T00:31:23","date_gmt":"2024-11-03T16:31:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160729\/"},"modified":"2024-11-04T00:31:24","modified_gmt":"2024-11-03T16:31:24","slug":"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-float%e3%80%81double%e3%80%81decimal%ef%bc%88%e5%b0%8f%e6%95%b8%e9%a1%9e%e5%9e%8b%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160729\/","title":{"rendered":"\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL FLOAT\u3001DOUBLE\u3001DECIMAL\uff08\u5c0f\u6578\u985e\u578b\uff09"},"content":{"rendered":"<h1 id=\"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-float%e3%80%81double%e3%80%81decimal%ef%bc%88%e5%b0%8f%e6%95%b8%e9%a1%9e%e5%9e%8b%ef%bc%89-Anjznbofmg\">\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL FLOAT\u3001DOUBLE\u3001DECIMAL\uff08\u5c0f\u6578\u985e\u578b\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\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 \u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u985e\u578b\u4f86\u8655\u7406\u5c0f\u6578\uff0c\u5305\u62ec FLOAT\u3001DOUBLE \u548c DECIMAL\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e09\u7a2e\u5c0f\u6578\u985e\u578b\u7684\u7279\u9ede\u3001\u4f7f\u7528\u5834\u666f\u53ca\u5176\u512a\u7f3a\u9ede\u3002<\/p>\n<h2 id=\"1-float-Anjznbofmg\">1. FLOAT<\/h2>\n<p>FLOAT \u662f\u4e00\u7a2e\u55ae\u7cbe\u5ea6\u6d6e\u9ede\u6578\u985e\u578b\uff0c\u901a\u5e38\u7528\u65bc\u9700\u8981\u5b58\u5132\u5c0f\u6578\u7684\u60c5\u6cc1\u3002\u5b83\u7684\u5b58\u5132\u5927\u5c0f\u70ba 4 \u5b57\u7bc0\uff0c\u80fd\u5920\u8868\u793a\u7684\u6578\u503c\u7bc4\u570d\u5927\u7d04\u662f -3.402823466E+38 \u5230 3.402823466E+38\u3002<\/p>\n<h3 id=\"1-1-%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-Anjznbofmg\">1.1 \u4f7f\u7528\u5834\u666f<\/h3>\n<ul>\n<li>\u7576\u9700\u8981\u5b58\u5132\u7684\u6578\u64da\u7bc4\u570d\u975e\u5e38\u5927\uff0c\u4f46\u5c0d\u7cbe\u5ea6\u8981\u6c42\u4e0d\u9ad8\u6642\uff0cFLOAT \u662f\u4e00\u500b\u5408\u9069\u7684\u9078\u64c7\u3002<\/li>\n<li>\u4f8b\u5982\uff0c\u79d1\u5b78\u8a08\u7b97\u6216\u5de5\u7a0b\u61c9\u7528\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u8655\u7406\u975e\u5e38\u5927\u7684\u6578\u503c\u3002<\/li>\n<\/ul>\n<h3 id=\"1-2-%e5%84%aa%e7%bc%ba%e9%bb%9e-Anjznbofmg\">1.2 \u512a\u7f3a\u9ede<\/h3>\n<p>FLOAT \u7684\u512a\u9ede\u5728\u65bc\u5176\u4f54\u7528\u7684\u5b58\u5132\u7a7a\u9593\u8f03\u5c0f\uff0c\u9069\u5408\u5927\u898f\u6a21\u6578\u64da\u7684\u5b58\u5132\u3002\u7136\u800c\uff0c\u7531\u65bc\u5176\u7cbe\u5ea6\u6709\u9650\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u8a08\u7b97\u7d50\u679c\u7684\u8aa4\u5dee\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u591a\u6b21\u904b\u7b97\u6642\u3002<\/p>\n<h2 id=\"2-double-Anjznbofmg\">2. DOUBLE<\/h2>\n<p>DOUBLE \u662f\u4e00\u7a2e\u96d9\u7cbe\u5ea6\u6d6e\u9ede\u6578\u985e\u578b\uff0c\u901a\u5e38\u7528\u65bc\u9700\u8981\u66f4\u9ad8\u7cbe\u5ea6\u7684\u60c5\u6cc1\u3002\u5b83\u7684\u5b58\u5132\u5927\u5c0f\u70ba 8 \u5b57\u7bc0\uff0c\u80fd\u5920\u8868\u793a\u7684\u6578\u503c\u7bc4\u570d\u5927\u7d04\u662f -1.7976931348623157E+308 \u5230 1.7976931348623157E+308\u3002<\/p>\n<h3 id=\"2-1-%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-Anjznbofmg\">2.1 \u4f7f\u7528\u5834\u666f<\/h3>\n<ul>\n<li>\u7576\u9700\u8981\u66f4\u9ad8\u7684\u7cbe\u5ea6\u548c\u7bc4\u570d\u6642\uff0cDOUBLE \u662f\u66f4\u597d\u7684\u9078\u64c7\u3002<\/li>\n<li>\u4f8b\u5982\uff0c\u91d1\u878d\u61c9\u7528\u4e2d\uff0c\u5c0d\u65bc\u91d1\u984d\u7684\u8a08\u7b97\u9700\u8981\u66f4\u9ad8\u7684\u7cbe\u5ea6\uff0c\u4ee5\u907f\u514d\u56e0\u6d6e\u9ede\u6578\u8aa4\u5dee\u800c\u5c0e\u81f4\u7684\u640d\u5931\u3002<\/li>\n<\/ul>\n<h3 id=\"2-2-%e5%84%aa%e7%bc%ba%e9%bb%9e-Anjznbofmg\">2.2 \u512a\u7f3a\u9ede<\/h3>\n<p>DOUBLE \u7684\u4e3b\u8981\u512a\u9ede\u662f\u5176\u80fd\u5920\u63d0\u4f9b\u66f4\u9ad8\u7684\u7cbe\u5ea6\u548c\u66f4\u5927\u7684\u6578\u503c\u7bc4\u570d\uff0c\u4f46\u76f8\u5c0d\u65bc FLOAT\uff0c\u5b83\u4f54\u7528\u7684\u5b58\u5132\u7a7a\u9593\u66f4\u5927\uff0c\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\u3002<\/p>\n<h2 id=\"3-decimal-Anjznbofmg\">3. DECIMAL<\/h2>\n<p>DECIMAL \u662f\u4e00\u7a2e\u5b9a\u9ede\u6578\u985e\u578b\uff0c\u901a\u5e38\u7528\u65bc\u9700\u8981\u7cbe\u78ba\u8a08\u7b97\u7684\u60c5\u6cc1\u3002\u5b83\u7684\u5b58\u5132\u5927\u5c0f\u6839\u64da\u7cbe\u5ea6\u800c\u7570\uff0c\u901a\u5e38\u7528\u65bc\u91d1\u878d\u548c\u5546\u696d\u61c9\u7528\u4e2d\u3002<\/p>\n<h3 id=\"3-1-%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-Anjznbofmg\">3.1 \u4f7f\u7528\u5834\u666f<\/h3>\n<ul>\n<li>\u7576\u9700\u8981\u7cbe\u78ba\u7684\u6578\u503c\u8a08\u7b97\u6642\uff0cDECIMAL \u662f\u6700\u4f73\u9078\u64c7\u3002<\/li>\n<li>\u4f8b\u5982\uff0c\u5728\u8655\u7406\u8ca8\u5e63\u6642\uff0c\u4f7f\u7528 DECIMAL \u53ef\u4ee5\u907f\u514d\u6d6e\u9ede\u6578\u5e36\u4f86\u7684\u8aa4\u5dee\u3002<\/li>\n<\/ul>\n<h3 id=\"3-2-%e5%84%aa%e7%bc%ba%e9%bb%9e-Anjznbofmg\">3.2 \u512a\u7f3a\u9ede<\/h3>\n<p>DECIMAL \u7684\u512a\u9ede\u5728\u65bc\u5176\u80fd\u5920\u63d0\u4f9b\u7cbe\u78ba\u7684\u6578\u503c\u8868\u793a\uff0c\u7279\u5225\u9069\u5408\u65bc\u9700\u8981\u7cbe\u78ba\u8a08\u7b97\u7684\u5834\u666f\u3002\u7136\u800c\uff0c\u5b83\u7684\u7f3a\u9ede\u662f\u76f8\u5c0d\u65bc FLOAT \u548c DOUBLE\uff0cDECIMAL \u7684\u6027\u80fd\u53ef\u80fd\u8f03\u4f4e\uff0c\u56e0\u70ba\u5b83\u9700\u8981\u66f4\u591a\u7684\u8a08\u7b97\u8cc7\u6e90\u4f86\u8655\u7406\u3002<\/p>\n<h2 id=\"4-%e7%b8%bd%e7%b5%90-Anjznbofmg\">4. \u7e3d\u7d50<\/h2>\n<p>\u5728\u9078\u64c7 MySQL \u4e2d\u7684\u5c0f\u6578\u985e\u578b\u6642\uff0c\u958b\u767c\u8005\u9700\u8981\u6839\u64da\u5177\u9ad4\u7684\u61c9\u7528\u5834\u666f\u4f86\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u3002FLOAT \u548c DOUBLE \u9069\u5408\u65bc\u9700\u8981\u8655\u7406\u5927\u7bc4\u570d\u6578\u503c\u7684\u60c5\u6cc1\uff0c\u800c DECIMAL \u5247\u9069\u5408\u65bc\u9700\u8981\u7cbe\u78ba\u8a08\u7b97\u7684\u5834\u666f\u3002\u4e86\u89e3\u9019\u4e9b\u5c0f\u6578\u985e\u578b\u7684\u7279\u9ede\u548c\u4f7f\u7528\u5834\u666f\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728\u8a2d\u8a08\u8cc7\u6599\u5eab\u6642\u505a\u51fa\u66f4\u660e\u667a\u7684\u9078\u64c7\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\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u4f01\u696d\u9084\u662f\u5927\u578b\u4f01\u696d\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u4e2d\u7684FLOAT\u3001DOUBLE\u548cDECIMAL\u6578\u64da\u985e\u578b\uff0c\u4e86\u89e3\u5176\u7279\u6027\u3001\u4f7f\u7528\u5834\u666f\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u8cc7\u6599\u5eab\u7ba1\u7406\u6280\u80fd\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-160729","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160729","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=160729"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160729\/revisions"}],"predecessor-version":[{"id":160730,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160729\/revisions\/160730"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160729"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160729"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160729"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}