{"id":80890,"date":"2024-10-16T14:47:16","date_gmt":"2024-10-16T06:47:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/80890\/"},"modified":"2024-10-16T14:47:16","modified_gmt":"2024-10-16T06:47:16","slug":"mysql%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%80%a3%e6%8e%a5%e5%87%bd%e6%95%b8%e7%94%a8%e6%b3%95%e7%b0%a1%e4%bb%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/80890\/","title":{"rendered":"MySQL\u5b57\u7b26\u4e32\u9023\u63a5\u51fd\u6578\u7528\u6cd5\u7c21\u4ecb"},"content":{"rendered":"<h1 id=\"mysql%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%80%a3%e6%8e%a5%e5%87%bd%e6%95%b8%e7%94%a8%e6%b3%95%e7%b0%a1%e4%bb%8b-QLErzaAryJ\">MySQL\u5b57\u7b26\u4e32\u9023\u63a5\u51fd\u6578\u7528\u6cd5\u7c21\u4ecb<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5b57\u7b26\u4e32\u64cd\u4f5c\u662f\u975e\u5e38\u5e38\u898b\u7684\u9700\u6c42\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5b57\u7b26\u4e32\u64cd\u4f5c\u51fd\u6578\uff0c\u5176\u4e2d\u5b57\u7b26\u4e32\u9023\u63a5\u51fd\u6578\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u4ecb\u7d39MySQL\u4e2d\u7684\u5b57\u7b26\u4e32\u9023\u63a5\u51fd\u6578\u53ca\u5176\u7528\u6cd5\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u8655\u7406\u5b57\u7b26\u4e32\u6578\u64da\u3002<\/p>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%80%a3%e6%8e%a5%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-QLErzaAryJ\">\u5b57\u7b26\u4e32\u9023\u63a5\u51fd\u6578\u6982\u8ff0<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u5b57\u7b26\u4e32\u9023\u63a5\u4e3b\u8981\u4f7f\u7528\u5169\u500b\u51fd\u6578\uff1a<code>CONCAT()<\/code>\u548c<code>CONCAT_WS()<\/code>\u3002<\/p>\n<h3 id=\"1-concat-%e5%87%bd%e6%95%b8-QLErzaAryJ\">1. CONCAT() \u51fd\u6578<\/h3>\n<p><code>CONCAT()<\/code>\u51fd\u6578\u7528\u65bc\u5c07\u5169\u500b\u6216\u591a\u500b\u5b57\u7b26\u4e32\u9023\u63a5\u6210\u4e00\u500b\u5b57\u7b26\u4e32\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CONCAT(string1, string2, ...)<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>users<\/code>\u7684\u8868\uff0c\u5305\u542b<code>first_name<\/code>\u548c<code>last_name<\/code>\u5169\u500b\u5b57\u6bb5\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528<code>CONCAT()<\/code>\u51fd\u6578\u4f86\u7372\u53d6\u5168\u540d\uff1a<\/p>\n<pre><code>SELECT CONCAT(first_name, ' ', last_name) AS full_name FROM users;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u7528\u6236\u7684\u5168\u540d\uff0c\u4e26\u5728\u540d\u5b57\u548c\u59d3\u6c0f\u4e4b\u9593\u6dfb\u52a0\u4e00\u500b\u7a7a\u683c\u3002<\/p>\n<h3 id=\"2-concat_ws-%e5%87%bd%e6%95%b8-QLErzaAryJ\">2. CONCAT_WS() \u51fd\u6578<\/h3>\n<p><code>CONCAT_WS()<\/code>\u51fd\u6578\u7684\u529f\u80fd\u8207<code>CONCAT()<\/code>\u985e\u4f3c\uff0c\u4f46\u5b83\u5141\u8a31\u7528\u6236\u6307\u5b9a\u4e00\u500b\u5206\u9694\u7b26\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CONCAT_WS(separator, string1, string2, ...)<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u5e0c\u671b\u7528\u9017\u865f\u5206\u9694\u7528\u6236\u7684\u5168\u540d\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT CONCAT_WS(', ', first_name, last_name) AS full_name FROM users;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u7528\u6236\u7684\u5168\u540d\uff0c\u4e26\u7528\u9017\u865f\u548c\u7a7a\u683c\u5206\u9694\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-QLErzaAryJ\">\u4f7f\u7528\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528\u5b57\u7b26\u4e32\u9023\u63a5\u51fd\u6578\u7684\u5be6\u969b\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-1%ef%bc%9a%e9%80%a3%e6%8e%a5%e5%a4%9a%e5%80%8b%e5%ad%97%e6%ae%b5-QLErzaAryJ\">\u793a\u4f8b 1\uff1a\u9023\u63a5\u591a\u500b\u5b57\u6bb5<\/h3>\n<pre><code>SELECT CONCAT(first_name, ' ', middle_name, ' ', last_name) AS full_name FROM users;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u5305\u542b\u4e2d\u9593\u540d\u7684\u5168\u540d\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-2%ef%bc%9a%e4%bd%bf%e7%94%a8%e5%88%86%e9%9a%94%e7%ac%a6%e9%80%a3%e6%8e%a5-QLErzaAryJ\">\u793a\u4f8b 2\uff1a\u4f7f\u7528\u5206\u9694\u7b26\u9023\u63a5<\/h3>\n<pre><code>SELECT CONCAT_WS('-', area_code, phone_number) AS full_phone FROM contacts;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u683c\u5f0f\u5316\u7684\u96fb\u8a71\u865f\u78bc\uff0c\u4f7f\u7528\u77ed\u6a6b\u4f5c\u70ba\u5206\u9694\u7b26\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-QLErzaAryJ\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u5b57\u7b26\u4e32\u9023\u63a5\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u4efb\u4e00\u53c3\u6578\u70ba<code>NULL<\/code>\uff0c<code>CONCAT()<\/code>\u51fd\u6578\u5c07\u5ffd\u7565\u8a72\u53c3\u6578\uff0c\u800c<code>CONCAT_WS()<\/code>\u5247\u6703\u5c07<code>NULL<\/code>\u8996\u70ba\u7a7a\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\u9650\u5236\u53d6\u6c7a\u65bcMySQL\u7684\u7248\u672c\u548c\u914d\u7f6e\uff0c\u904e\u9577\u7684\u5b57\u7b26\u4e32\u53ef\u80fd\u6703\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<li>\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u5b57\u7b26\u4e32\u9023\u63a5\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u5fc5\u8981\u6642\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-QLErzaAryJ\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u4e2d\u7684\u5b57\u7b26\u4e32\u9023\u63a5\u51fd\u6578\u5982<code>CONCAT()<\/code>\u548c<code>CONCAT_WS()<\/code>\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u5b57\u7b26\u4e32\u64cd\u4f5c\u80fd\u529b\u3002\u901a\u904e\u9019\u4e9b\u51fd\u6578\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u5c07\u591a\u500b\u5b57\u7b26\u4e32\u5408\u4f75\u70ba\u4e00\u500b\uff0c\u4e26\u6839\u64da\u9700\u8981\u6dfb\u52a0\u5206\u9694\u7b26\u3002\u9019\u4e9b\u529f\u80fd\u5728\u6578\u64da\u8655\u7406\u548c\u5831\u544a\u751f\u6210\u4e2d\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0c\u4eab\u53d7\u7a69\u5b9a\u548c\u5feb\u901f\u7684\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u5b57\u7b26\u4e32\u9023\u63a5\u51fd\u6578\u7684\u7528\u6cd5\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5730\u5408\u4f75\u591a\u500b\u5b57\u7b26\u4e32\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\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-80890","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80890","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=80890"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80890\/revisions"}],"predecessor-version":[{"id":80891,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80890\/revisions\/80891"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=80890"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=80890"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=80890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}