{"id":121036,"date":"2024-10-25T11:01:18","date_gmt":"2024-10-25T03:01:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/121036\/"},"modified":"2024-10-25T11:01:19","modified_gmt":"2024-10-25T03:01:19","slug":"mysql%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%99%95%e7%90%86%e5%87%bd%e6%95%b8concat_ws","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/121036\/","title":{"rendered":"MySQL\u5b57\u7b26\u4e32\u8655\u7406\u51fd\u6578concat_ws()"},"content":{"rendered":"<h1 id=\"mysql%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%99%95%e7%90%86%e5%87%bd%e6%95%b8concat_ws-tnWPmHtnCI\">MySQL\u5b57\u7b26\u4e32\u8655\u7406\u51fd\u6578concat_ws()<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5b57\u7b26\u4e32\u8655\u7406\u662f\u4e00\u500b\u91cd\u8981\u7684\u4efb\u52d9\u3002MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u5b57\u7b26\u4e32\u8655\u7406\u51fd\u6578\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f<strong>concat_ws()<\/strong>\u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5c07\u591a\u500b\u5b57\u7b26\u4e32\u9023\u63a5\u5728\u4e00\u8d77\uff0c\u4e26\u5728\u5b83\u5011\u4e4b\u9593\u63d2\u5165\u6307\u5b9a\u7684\u5206\u9694\u7b26\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0econcat_ws()\u51fd\u6578\u7684\u7528\u6cd5\u3001\u8a9e\u6cd5\u53ca\u5176\u5be6\u969b\u61c9\u7528\u3002<\/p>\n<h2 id=\"concat_ws%e5%87%bd%e6%95%b8%e7%9a%84%e8%aa%9e%e6%b3%95-tnWPmHtnCI\">concat_ws()\u51fd\u6578\u7684\u8a9e\u6cd5<\/h2>\n<p>concat_ws()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CONCAT_WS(separator, str1, str2, ...)<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<strong>separator<\/strong>\u662f\u7528\u4f86\u5206\u9694\u5b57\u7b26\u4e32\u7684\u5b57\u7b26\uff0c\u800c<strong>str1, str2, &#8230;<\/strong>\u5247\u662f\u8981\u9023\u63a5\u7684\u5b57\u7b26\u4e32\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u67d0\u500b\u5b57\u7b26\u4e32\u70baNULL\uff0cconcat_ws()\u51fd\u6578\u6703\u81ea\u52d5\u5ffd\u7565\u5b83\uff0c\u4e0d\u6703\u5728\u7d50\u679c\u4e2d\u7522\u751f\u591a\u9918\u7684\u5206\u9694\u7b26\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-tnWPmHtnCI\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528concat_ws()\u51fd\u6578\u7684\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b1%ef%bc%9a%e5%9f%ba%e6%9c%ac%e7%94%a8%e6%b3%95-tnWPmHtnCI\">\u7bc4\u4f8b1\uff1a\u57fa\u672c\u7528\u6cd5<\/h3>\n<pre><code>SELECT CONCAT_WS('-', '2023', '10', '01') AS formatted_date;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de<strong>2023-10-01<\/strong>\uff0c\u5c07\u5e74\u4efd\u3001\u6708\u4efd\u548c\u65e5\u671f\u7528\u77ed\u6a6b\u7dda\u9023\u63a5\u8d77\u4f86\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b2%ef%bc%9a%e8%99%95%e7%90%86null%e5%80%bc-tnWPmHtnCI\">\u7bc4\u4f8b2\uff1a\u8655\u7406NULL\u503c<\/h3>\n<pre><code>SELECT CONCAT_WS(',', 'Apple', NULL, 'Banana', 'Cherry') AS fruits;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de<strong>Apple,Banana,Cherry<\/strong>\uff0c\u5176\u4e2dNULL\u503c\u88ab\u81ea\u52d5\u5ffd\u7565\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b3%ef%bc%9a%e5%9c%a8%e6%9f%a5%e8%a9%a2%e4%b8%ad%e4%bd%bf%e7%94%a8-tnWPmHtnCI\">\u7bc4\u4f8b3\uff1a\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<strong>users<\/strong>\u7684\u8868\uff0c\u5305\u542b\u7528\u6236\u7684\u540d\u5b57\u548c\u59d3\u6c0f\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528concat_ws()\u4f86\u751f\u6210\u5b8c\u6574\u7684\u59d3\u540d\uff1a<\/p>\n<pre><code>SELECT CONCAT_WS(' ', first_name, last_name) AS full_name FROM users;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6bcf\u500b\u7528\u6236\u7684\u5b8c\u6574\u59d3\u540d\uff0c\u540d\u5b57\u548c\u59d3\u6c0f\u4e4b\u9593\u7528\u7a7a\u683c\u5206\u9694\u3002<\/p>\n<h2 id=\"concat_ws%e7%9a%84%e5%84%aa%e5%8b%a2-tnWPmHtnCI\">concat_ws()\u7684\u512a\u52e2<\/h2>\n<p>\u4f7f\u7528concat_ws()\u51fd\u6578\u6709\u5e7e\u500b\u660e\u986f\u7684\u512a\u52e2\uff1a<\/p>\n<ul>\n<li><strong>\u7c21\u5316\u4ee3\u78bc\uff1a<\/strong>\u4f7f\u7528concat_ws()\u53ef\u4ee5\u6e1b\u5c11\u624b\u52d5\u8655\u7406NULL\u503c\u7684\u9700\u8981\uff0c\u8b93\u4ee3\u78bc\u66f4\u7c21\u6f54\u3002<\/li>\n<li><strong>\u9748\u6d3b\u6027\uff1a<\/strong>\u53ef\u4ee5\u8f15\u9b06\u5730\u66f4\u6539\u5206\u9694\u7b26\uff0c\u53ea\u9700\u4fee\u6539\u4e00\u500b\u53c3\u6578\u5373\u53ef\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u53ef\u8b80\u6027\uff1a<\/strong>\u4f7f\u7528\u6b64\u51fd\u6578\u53ef\u4ee5\u4f7fSQL\u67e5\u8a62\u66f4\u6613\u65bc\u7406\u89e3\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u591a\u500b\u5b57\u7b26\u4e32\u6642\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-tnWPmHtnCI\">\u7d50\u8ad6<\/h2>\n<p>MySQL\u7684concat_ws()\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u4e14\u9748\u6d3b\u7684\u5de5\u5177\uff0c\u80fd\u5920\u6709\u6548\u5730\u8655\u7406\u5b57\u7b26\u4e32\u9023\u63a5\u548c\u5206\u9694\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u6574\u7406\u9084\u662f\u5831\u544a\u751f\u6210\u4e2d\uff0c\u9019\u500b\u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u5f88\u5927\u7684\u5e6b\u52a9\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528concat_ws()\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\u548c\u7dad\u8b77\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\uff0c\u7279\u5225\u662f\u6211\u5011\u63d0\u4f9b\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u89e3\u6c7a\u65b9\u6848\uff0c\u52a9\u60a8\u5728\u6578\u64da\u8655\u7406\u4e0a\u66f4\u4e0a\u4e00\u5c64\u6a13\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to use MySQL&#8217;s concat_ws() function to efficiently concatenate strings with a specified separator, enhancing your data manipulation skills.<\/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-121036","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/121036","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=121036"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/121036\/revisions"}],"predecessor-version":[{"id":121037,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/121036\/revisions\/121037"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=121036"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=121036"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=121036"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}