{"id":160081,"date":"2024-11-03T20:07:18","date_gmt":"2024-11-03T12:07:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160081\/"},"modified":"2024-11-03T20:07:19","modified_gmt":"2024-11-03T12:07:19","slug":"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-concat","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160081\/","title":{"rendered":"OceanBase \u6559\u7a0b\uff1aOceanBase CONCAT"},"content":{"rendered":"<h1 id=\"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-concat-cuYLzIGtHB\">OceanBase \u6559\u7a0b\uff1aOceanBase CONCAT<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cOceanBase \u4f5c\u70ba\u4e00\u500b\u9ad8\u6027\u80fd\u7684\u5206\u4f48\u5f0f\u6578\u64da\u5eab\uff0c\u8d8a\u4f86\u8d8a\u53d7\u5230\u958b\u767c\u8005\u7684\u9752\u775e\u3002\u5b83\u4e0d\u50c5\u652f\u6301\u9ad8\u4e26\u767c\u7684\u8b80\u5beb\u64cd\u4f5c\uff0c\u9084\u5177\u5099\u826f\u597d\u7684\u64f4\u5c55\u6027\u548c\u5bb9\u932f\u80fd\u529b\u3002\u672c\u6587\u5c07\u91cd\u9ede\u4ecb\u7d39 OceanBase \u4e2d\u7684 CONCAT \u51fd\u6578\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728 OceanBase \u4e2d\u9032\u884c\u5b57\u7b26\u4e32\u7684\u62fc\u63a5\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-concat-%e5%87%bd%e6%95%b8%ef%bc%9f-cuYLzIGtHB\">\u4ec0\u9ebc\u662f CONCAT \u51fd\u6578\uff1f<\/h2>\n<p>CONCAT \u51fd\u6578\u662f\u4e00\u500b\u7528\u65bc\u5b57\u7b26\u4e32\u62fc\u63a5\u7684\u5167\u5efa\u51fd\u6578\u3002\u5b83\u53ef\u4ee5\u5c07\u591a\u500b\u5b57\u7b26\u4e32\u9023\u63a5\u6210\u4e00\u500b\u5b57\u7b26\u4e32\uff0c\u4e26\u8fd4\u56de\u7d50\u679c\u3002\u9019\u5728\u8655\u7406\u6578\u64da\u6642\u975e\u5e38\u6709\u7528\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u5c07\u591a\u500b\u5b57\u6bb5\u7684\u503c\u5408\u4f75\u70ba\u4e00\u500b\u5b57\u6bb5\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<h2 id=\"concat-%e5%87%bd%e6%95%b8%e7%9a%84%e8%aa%9e%e6%b3%95-cuYLzIGtHB\">CONCAT \u51fd\u6578\u7684\u8a9e\u6cd5<\/h2>\n<pre><code>CONCAT(string1, string2, ..., stringN)<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0cstring1\u3001string2\u3001&#8230;\u3001stringN \u662f\u8981\u62fc\u63a5\u7684\u5b57\u7b26\u4e32\u3002\u9019\u4e9b\u5b57\u7b26\u4e32\u53ef\u4ee5\u662f\u6587\u672c\u3001\u6578\u64da\u5eab\u5b57\u6bb5\u6216\u5176\u4ed6\u8868\u9054\u5f0f\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-concat-%e5%87%bd%e6%95%b8%e7%9a%84%e7%a4%ba%e4%be%8b-cuYLzIGtHB\">\u4f7f\u7528 CONCAT \u51fd\u6578\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528 CONCAT \u51fd\u6578\u7684\u5be6\u969b\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-1%ef%bc%9a%e5%9f%ba%e6%9c%ac%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%8b%bc%e6%8e%a5-cuYLzIGtHB\">\u793a\u4f8b 1\uff1a\u57fa\u672c\u5b57\u7b26\u4e32\u62fc\u63a5<\/h3>\n<pre><code>SELECT CONCAT('Hello', ' ', 'World') AS greeting;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u4e00\u500b\u540d\u70ba greeting \u7684\u5b57\u6bb5\uff0c\u5176\u503c\u70ba &#8220;Hello World&#8221;\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-2%ef%bc%9a%e6%8b%bc%e6%8e%a5%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5-cuYLzIGtHB\">\u793a\u4f8b 2\uff1a\u62fc\u63a5\u6578\u64da\u5eab\u5b57\u6bb5<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba users \u7684\u8868\uff0c\u5305\u542b first_name \u548c last_name \u5169\u500b\u5b57\u6bb5\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 CONCAT \u51fd\u6578\u4f86\u62fc\u63a5\u9019\u5169\u500b\u5b57\u6bb5\uff1a<\/p>\n<pre><code>SELECT CONCAT(first_name, ' ', last_name) AS full_name FROM users;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6bcf\u500b\u7528\u6236\u7684\u5168\u540d\uff0c\u683c\u5f0f\u70ba &#8220;\u540d \u59d3&#8221;\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-3%ef%bc%9a%e8%99%95%e7%90%86-null-%e5%80%bc-cuYLzIGtHB\">\u793a\u4f8b 3\uff1a\u8655\u7406 NULL \u503c<\/h3>\n<p>\u5728\u4f7f\u7528 CONCAT \u51fd\u6578\u6642\uff0c\u5982\u679c\u5176\u4e2d\u4e00\u500b\u5b57\u7b26\u4e32\u70ba NULL\uff0c\u5247\u8fd4\u56de\u7684\u7d50\u679c\u5c07\u662f\u5176\u4ed6\u975e NULL \u5b57\u7b26\u4e32\u7684\u62fc\u63a5\u7d50\u679c\u3002\u9019\u8207\u67d0\u4e9b\u5176\u4ed6\u6578\u64da\u5eab\u7cfb\u7d71\u7684\u884c\u70ba\u4e0d\u540c\uff0c\u9019\u4e00\u9ede\u9700\u8981\u7279\u5225\u6ce8\u610f\u3002<\/p>\n<pre><code>SELECT CONCAT('Hello', NULL, 'World') AS result;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de &#8220;HelloWorld&#8221;\uff0c\u800c\u4e0d\u662f NULL\u3002<\/p>\n<h2 id=\"concat-%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-cuYLzIGtHB\">CONCAT \u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>CONCAT \u51fd\u6578\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u751f\u6210\u5831\u544a\u6642\u5408\u4f75\u591a\u500b\u5b57\u6bb5\u7684\u503c\u3002<\/li>\n<li>\u5728\u67e5\u8a62\u4e2d\u5275\u5efa\u66f4\u5177\u53ef\u8b80\u6027\u7684\u8f38\u51fa\u3002<\/li>\n<li>\u5728\u6578\u64da\u6e05\u7406\u904e\u7a0b\u4e2d\u5408\u4f75\u76f8\u95dc\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-cuYLzIGtHB\">\u7d50\u8ad6<\/h2>\n<p>CONCAT \u51fd\u6578\u662f OceanBase \u4e2d\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u8f15\u9b06\u5730\u9032\u884c\u5b57\u7b26\u4e32\u7684\u62fc\u63a5\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u67e5\u8a62\u9084\u662f\u6578\u64da\u8655\u7406\u904e\u7a0b\u4e2d\uff0c\u638c\u63e1 CONCAT \u51fd\u6578\u7684\u4f7f\u7528\u90fd\u80fd\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d OceanBase \u6216\u5176\u4ed6\u6578\u64da\u5eab\u6280\u8853\u6709\u8208\u8da3\uff0c\u4e26\u5e0c\u671b\u7372\u5f97\u66f4\u9ad8\u6548\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>Learn how to use the CONCAT function in OceanBase to efficiently combine strings in your database queries. Enhance your data manipulation skills today!<\/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-160081","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160081","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=160081"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160081\/revisions"}],"predecessor-version":[{"id":160082,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160081\/revisions\/160082"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160081"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160081"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}