{"id":179430,"date":"2024-11-09T01:45:21","date_gmt":"2024-11-08T17:45:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179430\/"},"modified":"2024-11-09T01:45:22","modified_gmt":"2024-11-08T17:45:22","slug":"%e5%a6%82%e4%bd%95%e5%84%aa%e5%8c%96%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84-in-%e7%94%a8%e6%b3%95-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84-in-%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179430\/","title":{"rendered":"\u5982\u4f55\u512a\u5316\u6578\u64da\u5eab\u4e2d\u7684 in \u7528\u6cd5 (\u6578\u64da\u5eab\u4e2d\u7684 in \u7528\u6cd5)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%84%aa%e5%8c%96%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84-in-%e7%94%a8%e6%b3%95-swnZDHoVdP\">\u5982\u4f55\u512a\u5316\u6578\u64da\u5eab\u4e2d\u7684 IN \u7528\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\uff0c<code>IN<\/code> \u5b50\u53e5\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5feb\u901f\u6aa2\u7d22\u591a\u500b\u503c\u3002\u7136\u800c\uff0c\u82e5\u4f7f\u7528\u4e0d\u7576\uff0c<code>IN<\/code> \u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u512a\u5316\u6578\u64da\u5eab\u4e2d\u7684 <code>IN<\/code> \u7528\u6cd5\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-in-%e5%ad%90%e5%8f%a5%ef%bc%9f-swnZDHoVdP\">\u4ec0\u9ebc\u662f IN \u5b50\u53e5\uff1f<\/h2>\n<p><code>IN<\/code> \u5b50\u53e5\u7528\u65bc SQL \u67e5\u8a62\u4e2d\uff0c\u5141\u8a31\u7528\u6236\u6307\u5b9a\u4e00\u7d44\u503c\uff0c\u4e26\u6aa2\u7d22\u7b26\u5408\u9019\u4e9b\u503c\u7684\u8a18\u9304\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT * FROM \u8868\u540d WHERE \u5217\u540d IN (\u503c1, \u503c2, \u503c3, ...);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u6240\u6709\u4f86\u81ea\u7279\u5b9a\u57ce\u5e02\u7684\u5ba2\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM \u5ba2\u6236 WHERE \u57ce\u5e02 IN ('\u9999\u6e2f', '\u65b0\u52a0\u5761', '\u6771\u4eac');<\/code><\/pre>\n<h2 id=\"in-%e5%ad%90%e5%8f%a5%e7%9a%84%e6%80%a7%e8%83%bd%e5%95%8f%e9%a1%8c-swnZDHoVdP\">IN \u5b50\u53e5\u7684\u6027\u80fd\u554f\u984c<\/h2>\n<p>\u96d6\u7136 <code>IN<\/code> \u5b50\u53e5\u5728\u7c21\u5316\u67e5\u8a62\u65b9\u9762\u975e\u5e38\u6709\u6548\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u5b83\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6027\u80fd\u554f\u984c\uff1a<\/p>\n<ul>\n<li><strong>\u5927\u91cf\u503c\uff1a<\/strong>\u7576 <code>IN<\/code> \u5b50\u53e5\u4e2d\u5305\u542b\u5927\u91cf\u503c\u6642\uff0c\u67e5\u8a62\u7684\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u5f71\u97ff\u3002\u6578\u64da\u5eab\u9700\u8981\u6aa2\u67e5\u6bcf\u500b\u503c\uff0c\u9019\u6703\u589e\u52a0\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u3002<\/li>\n<li><strong>\u7d22\u5f15\u4f7f\u7528\uff1a<\/strong>\u5982\u679c\u67e5\u8a62\u7684\u5217\u6c92\u6709\u9069\u7576\u7684\u7d22\u5f15\uff0c\u4f7f\u7528 <code>IN<\/code> \u53ef\u80fd\u6703\u5c0e\u81f4\u5168\u8868\u6383\u63cf\uff0c\u5f9e\u800c\u5f71\u97ff\u6027\u80fd\u3002<\/li>\n<li><strong>\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\uff1a<\/strong>\u5982\u679c <code>IN<\/code> \u5b50\u53e5\u4e2d\u7684\u503c\u8207\u5217\u7684\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\uff0c\u6578\u64da\u5eab\u53ef\u80fd\u7121\u6cd5\u6709\u6548\u5730\u4f7f\u7528\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%84%aa%e5%8c%96-in-%e5%ad%90%e5%8f%a5%e7%9a%84%e6%8a%80%e5%b7%a7-swnZDHoVdP\">\u512a\u5316 IN \u5b50\u53e5\u7684\u6280\u5de7<\/h2>\n<p>\u70ba\u4e86\u63d0\u9ad8 <code>IN<\/code> \u5b50\u53e5\u7684\u6027\u80fd\uff0c\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u7a2e\u512a\u5316\u6280\u5de7\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8-join-%e6%9b%bf%e4%bb%a3-in-swnZDHoVdP\">1. \u4f7f\u7528 JOIN \u66ff\u4ee3 IN<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528 <code>JOIN<\/code> \u4f86\u66ff\u4ee3 <code>IN<\/code> \u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u57ce\u5e02\u8868\uff0c\u4e26\u5e0c\u671b\u67e5\u8a62\u4f86\u81ea\u7279\u5b9a\u57ce\u5e02\u7684\u5ba2\u6236\uff1a<\/p>\n<pre><code>SELECT \u5ba2\u6236.* \nFROM \u5ba2\u6236 \nJOIN \u57ce\u5e02 ON \u5ba2\u6236.\u57ce\u5e02ID = \u57ce\u5e02.ID \nWHERE \u57ce\u5e02.\u540d\u7a31 IN ('\u9999\u6e2f', '\u65b0\u52a0\u5761', '\u6771\u4eac');<\/code><\/pre>\n<h3 id=\"2-%e9%99%90%e5%88%b6-in-%e5%ad%90%e5%8f%a5%e4%b8%ad%e7%9a%84%e5%80%bc-swnZDHoVdP\">2. \u9650\u5236 IN \u5b50\u53e5\u4e2d\u7684\u503c<\/h3>\n<p>\u5982\u679c\u53ef\u80fd\uff0c\u61c9\u8a72\u9650\u5236 <code>IN<\/code> \u5b50\u53e5\u4e2d\u7684\u503c\u6578\u91cf\u3002\u904e\u591a\u7684\u503c\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u53ef\u4ee5\u8003\u616e\u5c07\u67e5\u8a62\u62c6\u5206\u70ba\u591a\u500b\u8f03\u5c0f\u7684\u67e5\u8a62\uff0c\u6216\u4f7f\u7528\u5176\u4ed6\u689d\u4ef6\u4f86\u7e2e\u5c0f\u7bc4\u570d\u3002<\/p>\n<h3 id=\"3-%e7%a2%ba%e4%bf%9d%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bd%bf%e7%94%a8-swnZDHoVdP\">3. \u78ba\u4fdd\u7d22\u5f15\u7684\u4f7f\u7528<\/h3>\n<p>\u78ba\u4fdd\u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u5217\u6709\u9069\u7576\u7684\u7d22\u5f15\u3002\u9019\u6a23\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\uff0c\u7279\u5225\u662f\u5728\u4f7f\u7528 <code>IN<\/code> \u5b50\u53e5\u6642\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u4f86\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_\u57ce\u5e02 ON \u5ba2\u6236(\u57ce\u5e02);<\/code><\/pre>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8-exists-%e6%9b%bf%e4%bb%a3-in-swnZDHoVdP\">4. \u4f7f\u7528 EXISTS \u66ff\u4ee3 IN<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528 <code>EXISTS<\/code> \u53ef\u80fd\u6703\u6bd4 <code>IN<\/code> \u66f4\u6709\u6548\u3002<code>EXISTS<\/code> \u6703\u5728\u627e\u5230\u7b2c\u4e00\u500b\u5339\u914d\u6642\u505c\u6b62\u67e5\u8a62\uff0c\u800c <code>IN<\/code> \u6703\u6aa2\u67e5\u6240\u6709\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * \nFROM \u5ba2\u6236 \nWHERE EXISTS (SELECT 1 FROM \u57ce\u5e02 WHERE \u57ce\u5e02.ID = \u5ba2\u6236.\u57ce\u5e02ID AND \u57ce\u5e02.\u540d\u7a31 IN ('\u9999\u6e2f', '\u65b0\u52a0\u5761', '\u6771\u4eac'));<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-swnZDHoVdP\">\u7e3d\u7d50<\/h2>\n<p>\u512a\u5316\u6578\u64da\u5eab\u4e2d\u7684 <code>IN<\/code> \u7528\u6cd5\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u901a\u904e\u4f7f\u7528 <code>JOIN<\/code>\u3001\u9650\u5236\u503c\u7684\u6578\u91cf\u3001\u78ba\u4fdd\u7d22\u5f15\u7684\u4f7f\u7528\u4ee5\u53ca\u8003\u616e\u4f7f\u7528 <code>EXISTS<\/code>\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u63d0\u5347\u6578\u64da\u5eab\u7684\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u548c <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a> \u7684\u4fe1\u606f\uff0c\u5c07\u6709\u52a9\u65bc\u60a8\u5728\u6578\u64da\u5eab\u7ba1\u7406\u548c\u512a\u5316\u65b9\u9762\u505a\u51fa\u66f4\u660e\u667a\u7684\u6c7a\u7b56\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u512a\u5316\u6578\u64da\u5eab\u4e2d\u7684 IN \u7528\u6cd5\uff0c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\uff0c\u63d0\u5347\u6574\u9ad4\u6027\u80fd\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-179430","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179430","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=179430"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179430\/revisions"}],"predecessor-version":[{"id":179431,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179430\/revisions\/179431"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179430"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179430"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}