{"id":172101,"date":"2024-11-07T10:19:24","date_gmt":"2024-11-07T02:19:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172101\/"},"modified":"2024-11-07T10:19:25","modified_gmt":"2024-11-07T02:19:25","slug":"%e5%8e%bb%e6%8e%89%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%89%8d%e5%be%8c%e6%8c%87%e5%ae%9a%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%9a%84sql%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172101\/","title":{"rendered":"\u53bb\u6389\u5b57\u7b26\u4e32\u524d\u5f8c\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u7684SQL\u51fd\u6578"},"content":{"rendered":"<h1 id=\"%e5%8e%bb%e6%8e%89%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%89%8d%e5%be%8c%e6%8c%87%e5%ae%9a%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%9a%84sql%e5%87%bd%e6%95%b8-ERAWCtbIEs\">\u53bb\u6389\u5b57\u7b26\u4e32\u524d\u5f8c\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u7684SQL\u51fd\u6578<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5b57\u7b26\u4e32\u8655\u7406\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u5c24\u5176\u662f\u5728\u4f7f\u7528SQL\u9032\u884c\u6578\u64da\u67e5\u8a62\u548c\u64cd\u4f5c\u6642\uff0c\u7d93\u5e38\u9700\u8981\u53bb\u6389\u5b57\u7b26\u4e32\u524d\u5f8c\u7684\u7279\u5b9a\u5b57\u7b26\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u63a2\u8a0e\u5982\u4f55\u5728SQL\u4e2d\u5be6\u73fe\u9019\u4e00\u529f\u80fd\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%99%95%e7%90%86%e7%9a%84%e5%bf%85%e8%a6%81%e6%80%a7-ERAWCtbIEs\">\u5b57\u7b26\u4e32\u8655\u7406\u7684\u5fc5\u8981\u6027<\/h2>\n<p>\u5728\u8a31\u591a\u61c9\u7528\u5834\u666f\u4e2d\uff0c\u6578\u64da\u7684\u6574\u6f54\u6027\u548c\u4e00\u81f4\u6027\u81f3\u95dc\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u7576\u7528\u6236\u8f38\u5165\u6578\u64da\u6642\uff0c\u53ef\u80fd\u6703\u5728\u5b57\u7b26\u4e32\u7684\u958b\u982d\u6216\u7d50\u5c3e\u6dfb\u52a0\u591a\u9918\u7684\u7a7a\u683c\u6216\u7279\u5b9a\u5b57\u7b26\u3002\u9019\u4e9b\u591a\u9918\u7684\u5b57\u7b26\u53ef\u80fd\u6703\u5f71\u97ff\u6578\u64da\u7684\u67e5\u8a62\u548c\u6bd4\u8f03\uff0c\u56e0\u6b64\u9700\u8981\u5728\u5b58\u5132\u6216\u8655\u7406\u6578\u64da\u4e4b\u524d\u9032\u884c\u6e05\u7406\u3002<\/p>\n<h2 id=\"sql%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%99%95%e7%90%86%e5%87%bd%e6%95%b8-ERAWCtbIEs\">SQL\u4e2d\u7684\u5b57\u7b26\u4e32\u8655\u7406\u51fd\u6578<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u53bb\u6389\u5b57\u7b26\u4e32\u524d\u5f8c\u6307\u5b9a\u5b57\u7b26\u7684\u5e38\u7528\u65b9\u6cd5\u662f\u4f7f\u7528\u5167\u5efa\u7684\u5b57\u7b26\u4e32\u51fd\u6578\u3002\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u53ef\u80fd\u6703\u6709\u4e0d\u540c\u7684\u5be6\u73fe\u65b9\u5f0f\uff0c\u4f46\u5927\u591a\u6578\u90fd\u63d0\u4f9b\u4e86\u985e\u4f3c\u7684\u529f\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684SQL\u6578\u64da\u5eab\u53ca\u5176\u76f8\u61c9\u7684\u5b57\u7b26\u4e32\u8655\u7406\u51fd\u6578\uff1a<\/p>\n<ul>\n<li><strong>MySQL:<\/strong> \u4f7f\u7528 <code>TRIM()<\/code> \u51fd\u6578\u3002<\/li>\n<li><strong>SQL Server:<\/strong> \u4f7f\u7528 <code>LTRIM()<\/code> \u548c <code>RTRIM()<\/code> \u51fd\u6578\u3002<\/li>\n<li><strong>PostgreSQL:<\/strong> \u4f7f\u7528 <code>TRIM()<\/code> \u51fd\u6578\u3002<\/li>\n<\/ul>\n<h2 id=\"mysql%e4%b8%ad%e7%9a%84trim%e5%87%bd%e6%95%b8-ERAWCtbIEs\">MySQL\u4e2d\u7684TRIM\u51fd\u6578<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c<code>TRIM()<\/code> \u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u53bb\u6389\u5b57\u7b26\u4e32\u524d\u5f8c\u7684\u7a7a\u683c\u6216\u6307\u5b9a\u5b57\u7b26\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>TRIM([LEADING | TRAILING | BOTH] trim_character FROM string)<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT TRIM('  Hello World  '); -- \u53bb\u6389\u524d\u5f8c\u7a7a\u683c\nSELECT TRIM(BOTH 'x' FROM 'xxxHello Worldxxx'); -- \u53bb\u6389\u524d\u5f8c\u7684 'x'\n<\/code><\/pre>\n<h2 id=\"sql-server%e4%b8%ad%e7%9a%84ltrim%e5%92%8crtrim%e5%87%bd%e6%95%b8-ERAWCtbIEs\">SQL Server\u4e2d\u7684LTRIM\u548cRTRIM\u51fd\u6578<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c<code>LTRIM()<\/code> \u548c <code>RTRIM()<\/code> \u51fd\u6578\u5206\u5225\u7528\u65bc\u53bb\u6389\u5b57\u7b26\u4e32\u5de6\u5074\u548c\u53f3\u5074\u7684\u7a7a\u683c\u3002\u9019\u88e1\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u9019\u5169\u500b\u51fd\u6578\u53ea\u80fd\u53bb\u6389\u7a7a\u683c\uff0c\u7121\u6cd5\u53bb\u6389\u5176\u4ed6\u6307\u5b9a\u5b57\u7b26\u3002<\/p>\n<pre><code>SELECT LTRIM(RTRIM('  Hello World  ')); -- \u53bb\u6389\u524d\u5f8c\u7a7a\u683c\n<\/code><\/pre>\n<p>\u5982\u679c\u9700\u8981\u53bb\u6389\u7279\u5b9a\u5b57\u7b26\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>REPLACE()<\/code> \u51fd\u6578\u4f86\u5be6\u73fe\uff1a<\/p>\n<pre><code>SELECT REPLACE(REPLACE('xxxHello Worldxxx', 'x', ''), ' ', ''); -- \u53bb\u6389 'x' \u548c\u7a7a\u683c\n<\/code><\/pre>\n<h2 id=\"postgresql%e4%b8%ad%e7%9a%84trim%e5%87%bd%e6%95%b8-ERAWCtbIEs\">PostgreSQL\u4e2d\u7684TRIM\u51fd\u6578<\/h2>\n<p>\u5728PostgreSQL\u4e2d\uff0c<code>TRIM()<\/code> \u51fd\u6578\u7684\u7528\u6cd5\u8207MySQL\u76f8\u4f3c\u3002\u53ef\u4ee5\u7528\u4f86\u53bb\u6389\u5b57\u7b26\u4e32\u524d\u5f8c\u7684\u7a7a\u683c\u6216\u6307\u5b9a\u5b57\u7b26\uff1a<\/p>\n<pre><code>SELECT TRIM('  Hello World  '); -- \u53bb\u6389\u524d\u5f8c\u7a7a\u683c\nSELECT TRIM(BOTH 'x' FROM 'xxxHello Worldxxx'); -- \u53bb\u6389\u524d\u5f8c\u7684 'x'\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ERAWCtbIEs\">\u7e3d\u7d50<\/h2>\n<p>\u53bb\u6389\u5b57\u7b26\u4e32\u524d\u5f8c\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u5728SQL\u4e2d\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u7121\u8ad6\u662f\u4f7f\u7528MySQL\u3001SQL Server\u9084\u662fPostgreSQL\uff0c\u90fd\u53ef\u4ee5\u901a\u904e\u76f8\u61c9\u7684\u5b57\u7b26\u4e32\u8655\u7406\u51fd\u6578\u4f86\u5be6\u73fe\u3002\u9019\u4e9b\u51fd\u6578\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u6574\u6f54\u6027\uff0c\u9084\u80fd\u5728\u6578\u64da\u67e5\u8a62\u548c\u6bd4\u8f03\u4e2d\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u64cd\u4f5c\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u4f7f\u7528SQL\u51fd\u6578\u53bb\u6389\u5b57\u7b26\u4e32\u524d\u5f8c\u7684\u6307\u5b9a\u5b57\u7b26\uff0c\u7c21\u5316\u6578\u64da\u8655\u7406\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\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-172101","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172101","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=172101"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172101\/revisions"}],"predecessor-version":[{"id":172102,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172101\/revisions\/172102"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172101"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}