{"id":61019,"date":"2024-10-13T07:45:15","date_gmt":"2024-10-12T23:45:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/61019\/"},"modified":"2024-10-13T07:45:15","modified_gmt":"2024-10-12T23:45:15","slug":"db2%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%80%a3%e6%8e%a5%e7%9a%84%e5%af%a6%e7%8f%be%e9%81%8e%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/61019\/","title":{"rendered":"DB2\u5b57\u7b26\u4e32\u9023\u63a5\u7684\u5be6\u73fe\u904e\u7a0b"},"content":{"rendered":"<h1 id=\"db2%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%80%a3%e6%8e%a5%e7%9a%84%e5%af%a6%e7%8f%be%e9%81%8e%e7%a8%8b-AIVsgWYDtO\">DB2\u5b57\u7b26\u4e32\u9023\u63a5\u7684\u5be6\u73fe\u904e\u7a0b<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u5b57\u7b26\u4e32\u9023\u63a5\u662f\u4e00\u500b\u5e38\u898b\u7684\u64cd\u4f5c\uff0c\u5c24\u5176\u662f\u5728\u8655\u7406\u6578\u64da\u67e5\u8a62\u548c\u5831\u544a\u6642\u3002IBM\u7684DB2\u6578\u64da\u5eab\u7cfb\u7d71\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u5b57\u7b26\u4e32\u7684\u9023\u63a5\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eDB2\u4e2d\u5b57\u7b26\u4e32\u9023\u63a5\u7684\u5be6\u73fe\u904e\u7a0b\uff0c\u5305\u62ec\u57fa\u672c\u8a9e\u6cd5\u3001\u793a\u4f8b\u4ee5\u53ca\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"1-db2%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%80%a3%e6%8e%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-AIVsgWYDtO\">1. DB2\u5b57\u7b26\u4e32\u9023\u63a5\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u5b57\u7b26\u4e32\u9023\u63a5\u53ef\u4ee5\u901a\u904e\u4f7f\u7528\u300c||\u300d\u904b\u7b97\u7b26\u6216\u4f7f\u7528\u5167\u5efa\u51fd\u6578\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u5169\u7a2e\u4e3b\u8981\u65b9\u6cd5\u7684\u7c21\u8981\u4ecb\u7d39\uff1a<\/p>\n<h3 id=\"1-1-%e4%bd%bf%e7%94%a8%e3%80%8c%e3%80%8d%e9%81%8b%e7%ae%97%e7%ac%a6-AIVsgWYDtO\">1.1 \u4f7f\u7528\u300c||\u300d\u904b\u7b97\u7b26<\/h3>\n<p>\u6700\u5e38\u898b\u7684\u5b57\u7b26\u4e32\u9023\u63a5\u65b9\u6cd5\u662f\u4f7f\u7528\u300c||\u300d\u904b\u7b97\u7b26\u3002\u9019\u500b\u904b\u7b97\u7b26\u53ef\u4ee5\u5c07\u5169\u500b\u6216\u591a\u500b\u5b57\u7b26\u4e32\u9023\u63a5\u5728\u4e00\u8d77\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SELECT \u5b57\u6bb51 || \u5b57\u6bb52 AS \u9023\u63a5\u7d50\u679c FROM \u8868\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u540d\u70ba\u300c\u54e1\u5de5\u300d\u7684\u8868\uff0c\u5305\u542b\u300c\u540d\u300d\u548c\u300c\u59d3\u300d\u5169\u500b\u5b57\u6bb5\uff0c\u6211\u5011\u53ef\u4ee5\u9019\u6a23\u9023\u63a5\u5b83\u5011\uff1a<\/p>\n<pre><code>SELECT \u540d || ' ' || \u59d3 AS \u5168\u540d FROM \u54e1\u5de5;<\/code><\/pre>\n<h3 id=\"1-2-%e4%bd%bf%e7%94%a8concat%e5%87%bd%e6%95%b8-AIVsgWYDtO\">1.2 \u4f7f\u7528CONCAT\u51fd\u6578<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528DB2\u63d0\u4f9b\u7684CONCAT\u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u63a5\u53d7\u5169\u500b\u5b57\u7b26\u4e32\u4f5c\u70ba\u53c3\u6578\uff0c\u4e26\u8fd4\u56de\u5b83\u5011\u7684\u9023\u63a5\u7d50\u679c\u3002\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT CONCAT(\u5b57\u6bb51, \u5b57\u6bb52) AS \u9023\u63a5\u7d50\u679c FROM \u8868\u540d;<\/code><\/pre>\n<p>\u4f7f\u7528CONCAT\u51fd\u6578\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT CONCAT(\u540d, ' ', \u59d3) AS \u5168\u540d FROM \u54e1\u5de5;<\/code><\/pre>\n<h2 id=\"2-%e5%a4%9a%e5%80%8b%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%9a%84%e9%80%a3%e6%8e%a5-AIVsgWYDtO\">2. \u591a\u500b\u5b57\u7b26\u4e32\u7684\u9023\u63a5<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u9023\u63a5\u591a\u500b\u5b57\u7b26\u4e32\u3002\u4f7f\u7528\u300c||\u300d\u904b\u7b97\u7b26\u6642\uff0c\u53ef\u4ee5\u7c21\u55ae\u5730\u5c07\u591a\u500b\u5b57\u7b26\u4e32\u9023\u63a5\u5728\u4e00\u8d77\uff1a<\/p>\n<pre><code>SELECT \u5b57\u6bb51 || \u5b57\u6bb52 || \u5b57\u6bb53 AS \u9023\u63a5\u7d50\u679c FROM \u8868\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT \u540d || ' ' || \u59d3 || ' (' || \u8077\u4f4d || ')' AS \u54e1\u5de5\u4fe1\u606f FROM \u54e1\u5de5;<\/code><\/pre>\n<p>\u5982\u679c\u4f7f\u7528CONCAT\u51fd\u6578\uff0c\u5247\u9700\u8981\u5d4c\u5957\u4f7f\u7528\uff1a<\/p>\n<pre><code>SELECT CONCAT(CONCAT(\u540d, ' '), CONCAT(\u59d3, CONCAT(' (', \u8077\u4f4d, ')'))) AS \u54e1\u5de5\u4fe1\u606f FROM \u54e1\u5de5;<\/code><\/pre>\n<h2 id=\"3-%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-AIVsgWYDtO\">3. \u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u7a7a\u503c\u8655\u7406\uff1a<\/strong>\u5728DB2\u4e2d\uff0c\u5982\u679c\u4efb\u4f55\u4e00\u500b\u53c3\u8207\u9023\u63a5\u7684\u5b57\u7b26\u4e32\u70baNULL\uff0c\u5247\u6700\u7d42\u7d50\u679c\u4e5f\u5c07\u662fNULL\u3002\u56e0\u6b64\uff0c\u5728\u9032\u884c\u5b57\u7b26\u4e32\u9023\u63a5\u6642\uff0c\u61c9\u8003\u616e\u4f7f\u7528COALESCE\u51fd\u6578\u4f86\u8655\u7406\u7a7a\u503c\u3002<\/li>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u5b57\u7b26\u4e32\u9023\u63a5\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u3002\u5efa\u8b70\u5728\u5fc5\u8981\u6642\u9032\u884c\u512a\u5316\u3002<\/li>\n<li><strong>\u5b57\u7b26\u96c6\u554f\u984c\uff1a<\/strong>\u78ba\u4fdd\u6240\u6709\u53c3\u8207\u9023\u63a5\u7684\u5b57\u7b26\u4e32\u90fd\u4f7f\u7528\u76f8\u540c\u7684\u5b57\u7b26\u96c6\uff0c\u4ee5\u907f\u514d\u51fa\u73fe\u7de8\u78bc\u554f\u984c\u3002<\/li>\n<\/ul>\n<h2 id=\"4-%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e6%a1%88%e4%be%8b-AIVsgWYDtO\">4. \u5be6\u969b\u61c9\u7528\u6848\u4f8b<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u5b57\u7b26\u4e32\u9023\u63a5\u5e38\u7528\u65bc\u751f\u6210\u5831\u544a\u6216\u986f\u793a\u7528\u6236\u53cb\u597d\u7684\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u5ba2\u6236\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u986f\u793a\u5ba2\u6236\u7684\u5168\u540d\u548c\u5730\u5740\uff1a<\/p>\n<pre><code>SELECT CONCAT(CONCAT(\u5ba2\u6236\u540d, ' '), \u5ba2\u6236\u59d3) AS \u5ba2\u6236\u5168\u540d, \u5730\u5740 FROM \u5ba2\u6236;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u8b58\u5225\u5ba2\u6236\u4fe1\u606f\uff0c\u63d0\u5347\u7cfb\u7d71\u7684\u53ef\u7528\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-AIVsgWYDtO\">\u7e3d\u7d50<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u5b57\u7b26\u4e32\u9023\u63a5\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u529f\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u8655\u7406\u548c\u5c55\u793a\u6578\u64da\u3002\u7121\u8ad6\u662f\u4f7f\u7528\u300c||\u300d\u904b\u7b97\u7b26\u9084\u662fCONCAT\u51fd\u6578\uff0c\u958b\u767c\u8005\u90fd\u53ef\u4ee5\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u5b57\u7b26\u4e32\u9023\u63a5\u65b9\u5f0f\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u7cfb\u7d71\u6027\u80fd\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u548c<code><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3DB2\u5b57\u7b26\u4e32\u9023\u63a5\u7684\u5be6\u73fe\u904e\u7a0b\uff0c\u638c\u63e1\u5982\u4f55\u6709\u6548\u5730\u5408\u4f75\u548c\u8655\u7406\u5b57\u7b26\u4e32\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5eab\u64cd\u4f5c\u6548\u7387\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-61019","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61019","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=61019"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61019\/revisions"}],"predecessor-version":[{"id":61020,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61019\/revisions\/61020"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=61019"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=61019"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=61019"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}