{"id":144013,"date":"2024-11-01T03:08:19","date_gmt":"2024-10-31T19:08:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/144013\/"},"modified":"2024-11-01T03:08:20","modified_gmt":"2024-10-31T19:08:20","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2%ef%bc%9a%e7%b2%be%e6%ba%96%e5%ae%9a%e4%bd%8d%e6%95%b8%e6%93%9a-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/144013\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u6a21\u7cca\u67e5\u8a62\uff1a\u7cbe\u6e96\u5b9a\u4f4d\u6578\u64da (sql \u6578\u64da\u5eab\u6a21\u7cca\u67e5\u8a62)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2%ef%bc%9a%e7%b2%be%e6%ba%96%e5%ae%9a%e4%bd%8d%e6%95%b8%e6%93%9a-KNEHkcERXz\">SQL \u6578\u64da\u5eab\u6a21\u7cca\u67e5\u8a62\uff1a\u7cbe\u6e96\u5b9a\u4f4d\u6578\u64da<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u67e5\u8a62\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u4f5c\u70ba\u6700\u6d41\u884c\u7684\u6578\u64da\u5eab\u67e5\u8a62\u8a9e\u8a00\u4e4b\u4e00\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u67e5\u8a62\u65b9\u5f0f\u4f86\u7cbe\u78ba\u5b9a\u4f4d\u548c\u6aa2\u7d22\u6578\u64da\u3002\u5176\u4e2d\uff0c\u6a21\u7cca\u67e5\u8a62\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728\u4e0d\u78ba\u5b9a\u5177\u9ad4\u6578\u64da\u7684\u60c5\u6cc1\u4e0b\uff0c\u4f9d\u7136\u80fd\u5920\u627e\u5230\u6240\u9700\u7684\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2%ef%bc%9f-KNEHkcERXz\">\u4ec0\u9ebc\u662f\u6a21\u7cca\u67e5\u8a62\uff1f<\/h2>\n<p>\u6a21\u7cca\u67e5\u8a62\u662f\u6307\u5728\u67e5\u8a62\u6642\u4f7f\u7528\u4e0d\u5b8c\u5168\u5339\u914d\u7684\u689d\u4ef6\uff0c\u901a\u5e38\u7528\u65bc\u67e5\u627e\u5305\u542b\u7279\u5b9a\u6a21\u5f0f\u7684\u6578\u64da\u3002\u9019\u7a2e\u67e5\u8a62\u65b9\u5f0f\u7279\u5225\u9069\u5408\u65bc\u8655\u7406\u6587\u672c\u6578\u64da\uff0c\u56e0\u70ba\u7528\u6236\u53ef\u80fd\u53ea\u8a18\u5f97\u90e8\u5206\u4fe1\u606f\u6216\u5c0d\u4fe1\u606f\u7684\u5177\u9ad4\u5167\u5bb9\u4e0d\u592a\u78ba\u5b9a\u3002<\/p>\n<h2 id=\"sql-%e4%b8%ad%e7%9a%84%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2%e8%aa%9e%e6%b3%95-KNEHkcERXz\">SQL \u4e2d\u7684\u6a21\u7cca\u67e5\u8a62\u8a9e\u6cd5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u6a21\u7cca\u67e5\u8a62\u901a\u5e38\u4f7f\u7528 <code>LIKE<\/code> \u95dc\u9375\u5b57\u4f86\u5be6\u73fe\u3002<code>LIKE<\/code> \u5141\u8a31\u7528\u6236\u4f7f\u7528\u901a\u914d\u7b26\u4f86\u5339\u914d\u5b57\u7b26\u4e32\u3002\u6700\u5e38\u7528\u7684\u901a\u914d\u7b26\u6709\uff1a<\/p>\n<ul>\n<li><code>%<\/code>\uff1a\u4ee3\u8868\u96f6\u500b\u6216\u591a\u500b\u5b57\u7b26\u3002<\/li>\n<li><code>_<\/code>\uff1a\u4ee3\u8868\u55ae\u500b\u5b57\u7b26\u3002<\/li>\n<\/ul>\n<h3 id=\"%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%a4%ba%e4%be%8b-KNEHkcERXz\">\u6a21\u7cca\u67e5\u8a62\u7684\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 <code>LIKE<\/code> \u9032\u884c\u6a21\u7cca\u67e5\u8a62\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM customers WHERE name LIKE 'A%';<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u540d\u5b57\u4ee5\u5b57\u6bcd &#8220;A&#8221; \u958b\u982d\u7684\u5ba2\u6236\u8a18\u9304\u3002<\/p>\n<p>\u53e6\u4e00\u500b\u793a\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u60f3\u67e5\u627e\u6240\u6709\u5305\u542b &#8220;tech&#8221; \u7684\u516c\u53f8\u540d\u7a31\uff1a<\/p>\n<pre><code>SELECT * FROM companies WHERE name LIKE '%tech%';<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u516c\u53f8\u540d\u7a31\u4e2d\u5305\u542b &#8220;tech&#8221; \u7684\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-KNEHkcERXz\">\u6a21\u7cca\u67e5\u8a62\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u6a21\u7cca\u67e5\u8a62\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\u5834\u666f\uff1a<\/p>\n<ul>\n<li><strong>\u7528\u6236\u641c\u7d22\u529f\u80fd\uff1a<\/strong>\u8a31\u591a\u7db2\u7ad9\u548c\u61c9\u7528\u7a0b\u5e8f\u90fd\u63d0\u4f9b\u641c\u7d22\u529f\u80fd\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u8f38\u5165\u90e8\u5206\u95dc\u9375\u5b57\u4f86\u67e5\u627e\u76f8\u95dc\u5167\u5bb9\u3002<\/li>\n<li><strong>\u6578\u64da\u6e05\u7406\uff1a<\/strong>\u5728\u6578\u64da\u6e05\u7406\u904e\u7a0b\u4e2d\uff0c\u6a21\u7cca\u67e5\u8a62\u53ef\u4ee5\u5e6b\u52a9\u8b58\u5225\u548c\u5408\u4f75\u76f8\u4f3c\u7684\u6578\u64da\u689d\u76ee\u3002<\/li>\n<li><strong>\u5831\u544a\u751f\u6210\uff1a<\/strong>\u5728\u751f\u6210\u5831\u544a\u6642\uff0c\u53ef\u80fd\u9700\u8981\u6839\u64da\u90e8\u5206\u4fe1\u606f\u4f86\u7be9\u9078\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-KNEHkcERXz\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u6a21\u7cca\u67e5\u8a62\u975e\u5e38\u5f37\u5927\uff0c\u4f46\u5728\u4f7f\u7528\u6642\u4e5f\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u6027\u80fd\u554f\u984c\uff1a<\/strong>\u6a21\u7cca\u67e5\u8a62\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u9032\u884c\u67e5\u8a62\u6642\u3002\u5efa\u8b70\u5728\u5fc5\u8981\u6642\u4f7f\u7528\u7d22\u5f15\u4f86\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li><strong>\u5b89\u5168\u6027\uff1a<\/strong>\u5728\u8655\u7406\u7528\u6236\u8f38\u5165\u6642\uff0c\u61c9\u6ce8\u610f SQL \u6ce8\u5165\u653b\u64ca\u7684\u98a8\u96aa\uff0c\u5efa\u8b70\u4f7f\u7528\u53c3\u6578\u5316\u67e5\u8a62\u4f86\u9632\u6b62\u6b64\u985e\u554f\u984c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-KNEHkcERXz\">\u7d50\u8ad6<\/h2>\n<p>\u6a21\u7cca\u67e5\u8a62\u662f SQL \u4e2d\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u529f\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728\u4e0d\u78ba\u5b9a\u5177\u9ad4\u6578\u64da\u7684\u60c5\u6cc1\u4e0b\uff0c\u4f9d\u7136\u80fd\u5920\u7cbe\u6e96\u5b9a\u4f4d\u6240\u9700\u7684\u4fe1\u606f\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528 <code>LIKE<\/code> \u95dc\u9375\u5b57\u548c\u901a\u914d\u7b26\uff0c\u7528\u6236\u53ef\u4ee5\u6709\u6548\u5730\u6aa2\u7d22\u548c\u7ba1\u7406\u6578\u64da\u3002\u5c0d\u65bc\u9700\u8981\u8655\u7406\u5927\u91cf\u6578\u64da\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u638c\u63e1\u6a21\u7cca\u67e5\u8a62\u7684\u6280\u5de7\u5c07\u5927\u5927\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\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> \u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u6578\u64da\u7ba1\u7406\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u6578\u64da\u5eab\u6a21\u7cca\u67e5\u8a62\u6280\u8853\uff0c\u5b78\u7fd2\u5982\u4f55\u7cbe\u6e96\u5b9a\u4f4d\u6578\u64da\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u8207\u6e96\u78ba\u6027\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-144013","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144013","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=144013"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144013\/revisions"}],"predecessor-version":[{"id":144014,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144013\/revisions\/144014"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=144013"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=144013"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=144013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}