{"id":79118,"date":"2024-10-16T12:41:18","date_gmt":"2024-10-16T04:41:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79118\/"},"modified":"2024-10-16T12:41:18","modified_gmt":"2024-10-16T04:41:18","slug":"mysql%e6%8c%87%e4%bb%a4-ltrim%ef%bc%88%e5%8e%bb%e5%b7%a6%e5%81%b4%e7%a9%ba%e6%a0%bc%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79118\/","title":{"rendered":"MySQL\u6307\u4ee4: LTRIM()\uff08\u53bb\u5de6\u5074\u7a7a\u683c\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-ltrim%ef%bc%88%e5%8e%bb%e5%b7%a6%e5%81%b4%e7%a9%ba%e6%a0%bc%ef%bc%89-NliryQTbex\">MySQL\u6307\u4ee4: LTRIM()\uff08\u53bb\u5de6\u5074\u7a7a\u683c\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u6e05\u7406\u548c\u683c\u5f0f\u5316\u662f\u975e\u5e38\u91cd\u8981\u7684\u6b65\u9a5f\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u5e6b\u52a9\u7528\u6236\u8655\u7406\u6578\u64da\u3002\u5176\u4e2d\uff0cLTRIM()\u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u7528\u65bc\u53bb\u9664\u5b57\u7b26\u4e32\u5de6\u5074\u7684\u7a7a\u683c\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eLTRIM()\u51fd\u6578\u7684\u7528\u6cd5\u53ca\u5176\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"ltrim%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-NliryQTbex\">LTRIM()\u51fd\u6578\u6982\u8ff0<\/h2>\n<p>LTRIM()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>LTRIM(string)<\/code><\/pre>\n<p>\u9019\u88e1\u7684<strong>string<\/strong>\u662f\u8981\u8655\u7406\u7684\u5b57\u7b26\u4e32\u3002LTRIM()\u51fd\u6578\u5c07\u8fd4\u56de\u4e00\u500b\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u8a72\u5b57\u7b26\u4e32\u53bb\u9664\u4e86\u539f\u59cb\u5b57\u7b26\u4e32\u5de6\u5074\u7684\u6240\u6709\u7a7a\u683c\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8ltrim%e7%9a%84%e7%a4%ba%e4%be%8b-NliryQTbex\">\u4f7f\u7528LTRIM()\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528LTRIM()\u51fd\u6578\u7684\u793a\u4f8b\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u5176\u529f\u80fd\uff1a<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b1-%e5%9f%ba%e6%9c%ac%e7%94%a8%e6%b3%95-NliryQTbex\">\u793a\u4f8b1: \u57fa\u672c\u7528\u6cd5<\/h3>\n<pre><code>SELECT LTRIM('   Hello World!');<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u5f8c\uff0c\u8fd4\u56de\u7684\u7d50\u679c\u5c07\u662f\uff1a<\/p>\n<pre><code>Hello World!<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u539f\u59cb\u5b57\u7b26\u4e32\u4e2d\u7684\u5de6\u5074\u7a7a\u683c\u5df2\u88ab\u6210\u529f\u53bb\u9664\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b2-%e8%88%87%e5%85%b6%e4%bb%96%e5%87%bd%e6%95%b8%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8-NliryQTbex\">\u793a\u4f8b2: \u8207\u5176\u4ed6\u51fd\u6578\u7d50\u5408\u4f7f\u7528<\/h3>\n<p>LTRIM()\u51fd\u6578\u53ef\u4ee5\u8207\u5176\u4ed6\u5b57\u7b26\u4e32\u8655\u7406\u51fd\u6578\u7d50\u5408\u4f7f\u7528\uff0c\u4ee5\u9054\u5230\u66f4\u8907\u96dc\u7684\u6578\u64da\u8655\u7406\u9700\u6c42\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u5148\u4f7f\u7528LTRIM()\u53bb\u9664\u7a7a\u683c\uff0c\u7136\u5f8c\u518d\u4f7f\u7528UPPER()\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u5927\u5beb\uff1a<\/p>\n<pre><code>SELECT UPPER(LTRIM('   hello world!')); <\/code><\/pre>\n<p>\u57f7\u884c\u5f8c\uff0c\u7d50\u679c\u5c07\u662f\uff1a<\/p>\n<pre><code>HELLO WORLD!<\/code><\/pre>\n<h2 id=\"%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-NliryQTbex\">\u61c9\u7528\u5834\u666f<\/h2>\n<p>LTRIM()\u51fd\u6578\u5728\u591a\u7a2e\u60c5\u6cc1\u4e0b\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\u5834\u666f\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u6e05\u7406\uff1a<\/strong>\u5728\u5c0e\u5165\u6578\u64da\u6642\uff0c\u7d93\u5e38\u6703\u9047\u5230\u591a\u9918\u7684\u7a7a\u683c\uff0c\u4f7f\u7528LTRIM()\u53ef\u4ee5\u5e6b\u52a9\u6e05\u7406\u9019\u4e9b\u6578\u64da\u3002<\/li>\n<li><strong>\u7528\u6236\u8f38\u5165\u8655\u7406\uff1a<\/strong>\u5728\u8655\u7406\u7528\u6236\u8f38\u5165\u7684\u6578\u64da\u6642\uff0c\u53bb\u9664\u4e0d\u5fc5\u8981\u7684\u7a7a\u683c\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<li><strong>\u5831\u544a\u751f\u6210\uff1a<\/strong>\u5728\u751f\u6210\u5831\u544a\u6642\uff0c\u78ba\u4fdd\u5b57\u7b26\u4e32\u683c\u5f0f\u6b63\u78ba\u53ef\u4ee5\u63d0\u9ad8\u5831\u544a\u7684\u53ef\u8b80\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-NliryQTbex\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528LTRIM()\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>LTRIM()\u50c5\u53bb\u9664\u5de6\u5074\u7684\u7a7a\u683c\uff0c\u53f3\u5074\u7684\u7a7a\u683c\u4e0d\u6703\u53d7\u5230\u5f71\u97ff\u3002\u5982\u679c\u9700\u8981\u53bb\u9664\u53f3\u5074\u7a7a\u683c\uff0c\u53ef\u4ee5\u4f7f\u7528RTRIM()\u51fd\u6578\u3002<\/li>\n<li>\u5982\u679c\u5b57\u7b26\u4e32\u4e2d\u6c92\u6709\u7a7a\u683c\uff0cLTRIM()\u51fd\u6578\u5c07\u8fd4\u56de\u539f\u59cb\u5b57\u7b26\u4e32\u3002<\/li>\n<li>LTRIM()\u51fd\u6578\u4e0d\u6703\u6539\u8b8a\u539f\u59cb\u6578\u64da\uff0c\u50c5\u8fd4\u56de\u4e00\u500b\u65b0\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-NliryQTbex\">\u7e3d\u7d50<\/h2>\n<p>LTRIM()\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u5728MySQL\u4e2d\u6709\u6548\u5730\u8655\u7406\u5b57\u7b26\u4e32\u6578\u64da\u3002\u901a\u904e\u53bb\u9664\u5de6\u5074\u7a7a\u683c\uff0c\u60a8\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u7684\u6574\u6f54\u6027\u548c\u4e00\u81f4\u6027\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u6e05\u7406\u3001\u7528\u6236\u8f38\u5165\u8655\u7406\u9084\u662f\u5831\u544a\u751f\u6210\u4e2d\uff0cLTRIM()\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3MySQL\u7684\u5176\u4ed6\u529f\u80fd\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4LTRIM()\uff0c\u7528\u65bc\u53bb\u9664\u5b57\u4e32\u5de6\u5074\u7684\u7a7a\u683c\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u67e5\u8a62\u7d50\u679c\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-79118","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79118","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=79118"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79118\/revisions"}],"predecessor-version":[{"id":79119,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79118\/revisions\/79119"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}