{"id":79338,"date":"2024-10-16T12:59:25","date_gmt":"2024-10-16T04:59:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79338\/"},"modified":"2024-10-16T12:59:26","modified_gmt":"2024-10-16T04:59:26","slug":"mysql%e6%8c%87%e4%bb%a4-or%ef%bc%88%e9%82%8f%e8%bc%af%e6%88%96%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79338\/","title":{"rendered":"MySQL\u6307\u4ee4: OR\uff08\u908f\u8f2f\u6216\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-or%ef%bc%88%e9%82%8f%e8%bc%af%e6%88%96%ef%bc%89-UfdSontAFK\">MySQL\u6307\u4ee4: OR\uff08\u908f\u8f2f\u6216\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u958b\u6e90\u95dc\u806f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u67e5\u8a62\u6307\u4ee4\uff0c\u8b93\u4f7f\u7528\u8005\u80fd\u5920\u9748\u6d3b\u5730\u5f9e\u8cc7\u6599\u5eab\u4e2d\u6aa2\u7d22\u6240\u9700\u7684\u8cc7\u6599\u3002\u5176\u4e2d\uff0c\u908f\u8f2f\u904b\u7b97\u7b26\u201cOR\u201d\u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u6307\u4ee4\uff0c\u80fd\u5920\u5e6b\u52a9\u4f7f\u7528\u8005\u9032\u884c\u591a\u689d\u4ef6\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afor%e9%81%8b%e7%ae%97%e7%ac%a6%ef%bc%9f-UfdSontAFK\">\u4ec0\u9ebc\u662fOR\u904b\u7b97\u7b26\uff1f<\/h2>\n<p>\u5728SQL\u67e5\u8a62\u4e2d\uff0cOR\u904b\u7b97\u7b26\u7528\u65bc\u9023\u63a5\u591a\u500b\u689d\u4ef6\uff0c\u7576\u5176\u4e2d\u81f3\u5c11\u4e00\u500b\u689d\u4ef6\u70ba\u771f\u6642\uff0c\u6574\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u7d50\u679c\u3002\u9019\u4f7f\u5f97\u4f7f\u7528\u8005\u80fd\u5920\u5728\u67e5\u8a62\u4e2d\u9748\u6d3b\u5730\u6307\u5b9a\u591a\u500b\u689d\u4ef6\uff0c\u5f9e\u800c\u7372\u5f97\u66f4\u7cbe\u78ba\u7684\u8cc7\u6599\u3002<\/p>\n<h2 id=\"or%e9%81%8b%e7%ae%97%e7%ac%a6%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-UfdSontAFK\">OR\u904b\u7b97\u7b26\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u4f7f\u7528OR\u904b\u7b97\u7b26\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT column1, column2, ...\nFROM table_name\nWHERE condition1 OR condition2 OR condition3 ...;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>column1, column2, ...<\/code>\u662f\u8981\u6aa2\u7d22\u7684\u6b04\u4f4d\uff0c<code>table_name<\/code>\u662f\u8cc7\u6599\u8868\u7684\u540d\u7a31\uff0c\u800c<code>condition1, condition2, ...<\/code>\u5247\u662f\u67e5\u8a62\u7684\u689d\u4ef6\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-UfdSontAFK\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cemployees\u201d\u7684\u8cc7\u6599\u8868\uff0c\u8a72\u8868\u5305\u542b\u4ee5\u4e0b\u6b04\u4f4d\uff1a<code>id<\/code>\u3001<code>name<\/code>\u3001<code>department<\/code>\u548c<code>salary<\/code>\u3002\u5982\u679c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u6240\u6709\u5728\u201cSales\u201d\u90e8\u9580\u6216\u201cMarketing\u201d\u90e8\u9580\u5de5\u4f5c\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * \nFROM employees \nWHERE department = 'Sales' OR department = 'Marketing';<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728\u201cSales\u201d\u6216\u201cMarketing\u201d\u90e8\u9580\u5de5\u4f5c\u7684\u54e1\u5de5\u8cc7\u6599\u3002<\/p>\n<h2 id=\"or%e9%81%8b%e7%ae%97%e7%ac%a6%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-UfdSontAFK\">OR\u904b\u7b97\u7b26\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528OR\u904b\u7b97\u7b26\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li><strong>\u512a\u5148\u9806\u5e8f\uff1a<\/strong>\u5728\u8907\u96dc\u7684\u67e5\u8a62\u4e2d\uff0cOR\u904b\u7b97\u7b26\u7684\u512a\u5148\u9806\u5e8f\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u7d50\u679c\u3002\u5efa\u8b70\u4f7f\u7528\u62ec\u865f\u4f86\u660e\u78ba\u6307\u5b9a\u689d\u4ef6\u7684\u512a\u5148\u9806\u5e8f\u3002<\/li>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u4f7f\u7528OR\u904b\u7b97\u7b26\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u8cc7\u6599\u8868\u4e2d\u3002\u9069\u7576\u5730\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li><strong>NULL\u503c\u8655\u7406\uff1a<\/strong>\u5728\u9032\u884c\u67e5\u8a62\u6642\uff0c\u9700\u6ce8\u610fNULL\u503c\u7684\u8655\u7406\uff0c\u56e0\u70baNULL\u503c\u5728\u908f\u8f2f\u904b\u7b97\u4e2d\u53ef\u80fd\u6703\u5c0e\u81f4\u610f\u5916\u7684\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-UfdSontAFK\">\u7d50\u8ad6<\/h2>\n<p>MySQL\u4e2d\u7684OR\u904b\u7b97\u7b26\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u4f7f\u7528\u8005\u9032\u884c\u9748\u6d3b\u7684\u591a\u689d\u4ef6\u67e5\u8a62\u3002\u900f\u904e\u6b63\u78ba\u7684\u4f7f\u7528\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u5f9e\u8cc7\u6599\u5eab\u4e2d\u6aa2\u7d22\u6240\u9700\u7684\u8cc7\u6599\u3002\u7121\u8ad6\u662f\u5728\u5c0f\u578b\u5c08\u6848\u9084\u662f\u5927\u578b\u7cfb\u7d71\u4e2d\uff0c\u638c\u63e1OR\u904b\u7b97\u7b26\u7684\u4f7f\u7528\u90fd\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u63a2\u7d22\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684OR\u6307\u4ee4\uff0c\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528\u908f\u8f2f\u6216\u4f86\u67e5\u8a62\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387\u8207\u9748\u6d3b\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-79338","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79338","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=79338"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79338\/revisions"}],"predecessor-version":[{"id":79339,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79338\/revisions\/79339"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}