{"id":200676,"date":"2025-05-06T11:04:41","date_gmt":"2025-05-06T03:04:41","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200676\/"},"modified":"2025-05-06T11:04:41","modified_gmt":"2025-05-06T03:04:41","slug":"mysql-where-%e6%9d%a1%e4%bb%b6%e4%bb%85%e4%b8%ba%e5%ad%97%e6%ae%b5%e6%97%b6%ef%bc%8c%e4%b8%ba%e4%bb%80%e4%b9%88%e5%8f%aa%e8%bf%94%e5%9b%9e%e6%95%b0%e5%ad%97%e5%bc%80%e5%a4%b4%e7%9a%84%e6%95%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200676\/","title":{"rendered":"MySQL where \u6761\u4ef6\u4ec5\u4e3a\u5b57\u6bb5\u65f6\uff0c\u4e3a\u4ec0\u4e48\u53ea\u8fd4\u56de\u6570\u5b57\u5f00\u5934\u7684\u6570\u636e\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>MySQL where \u6761\u4ef6\u4ec5\u4e3a\u5b57\u6bb5\u65f6\uff0c\u4e3a\u4ec0\u4e48\u53ea\u8fd4\u56de\u6570\u5b57\u5f00\u5934\u7684\u6570\u636e\uff1f<\/h1>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241111\/173130539767319fb5d247f.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>MySQL \u4e2d where \u6761\u4ef6\u4ec5\u4e3a\u5b57\u6bb5\u7684\u60c5\u51b5<\/strong><\/p>\n<p>\u5728 MySQL \u4e2d\uff0c\u6267\u884c\u7c7b\u4f3c\u4e8e select &lt;\u5b57\u6bb5&gt; from &lt;\u8868\u540d&gt; where &lt;\u5b57\u6bb5&gt; \u7684\u67e5\u8be2\u65f6\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u4ec5\u8fd4\u56de\u6570\u5b57\u5f00\u5934\u6570\u636e\u7684\u60c5\u51b5\uff0c\u800c\u5b57\u6bcd\u548c 0 \u5f00\u5934\u7684\u4f1a\u88ab\u8fc7\u6ee4\u6389\u3002\u8fd9\u662f\u56e0\u4e3a where \u5b50\u53e5\u540e\u7684\u5b57\u6bb5\u9690\u5f0f\u5730\u4f5c\u4e3a\u8868\u8fbe\u5f0f\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n<p><strong>\u8868\u8fbe\u5f0f\u6c42\u503c<\/strong><\/p>\n<p>MySQL \u6587\u6863\u4e2d\u63cf\u8ff0\u4e86 where \u5b50\u53e5\u7684\u542b\u4e49\uff1a<\/p>\n<blockquote><p>\n  \u5982\u679c\u7ed9\u5b9a\u4e86 WHERE \u5b50\u53e5\uff0c\u5219\u8868\u660e\u5fc5\u987b\u6ee1\u8db3\u54ea\u4e9b\u6761\u4ef6\u624d\u80fd\u9009\u62e9\u884c\u3002 where_condition \u662f\u4e00\u4e2a\u8868\u8fbe\u5f0f\uff0c\u5bf9\u4e8e\u6bcf\u6761\u8981\u9009\u62e9\u7684\u884c\u6765\u8bf4\uff0c\u5176\u503c\u4e3a\u771f\u3002\n<\/p><\/blockquote>\n<p>\u8fd9\u610f\u5473\u7740 where \u5b50\u53e5\u4e2d\u7684\u8868\u8fbe\u5f0f\u53ea\u8981\u53ef\u4ee5\u8f6c\u6362\u4e3a true\uff0c\u5c31\u4f1a\u6ee1\u8db3\u6761\u4ef6\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u6848\u4f8b\u4e2d\uff0cwhere \u540e\u9762\u7684\u5b57\u6bb5\u53ef\u4ee5\u770b\u4f5c\u8868\u8fbe\u5f0f (&lt;\u5b57\u6bb5&gt;)\u3002\u5f53\u5b57\u6bb5\u7684\u503c\u662f\u975e\u96f6\u6570\u5b57\u65f6\uff0c\u8868\u8fbe\u5f0f\u4e3a true\uff0c\u5426\u5219\u4e3a false\u3002\u56e0\u6b64\uff0c\u67e5\u8be2\u4f1a\u8fd4\u56de\u975e\u96f6\u6570\u5b57\u5f00\u5934\u7684\u8bb0\u5f55\uff0c\u800c\u5b57\u6bcd\u548c 0 \u5f00\u5934\u7684\u8bb0\u5f55\u4f1a\u88ab\u8fc7\u6ee4\u6389\u3002<\/p>\n<p><strong>\u8868\u8fbe\u5f0f\u8bed\u6cd5<\/strong><\/p>\n<p>MySQL \u6587\u6863\u4e2d\u8fdb\u4e00\u6b65\u89e3\u91ca\u4e86\u5141\u8bb8\u5728 where \u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528\u7684\u8bed\u6cd5\u5143\u7d20\uff1a<\/p>\n<blockquote><p>\n  \u5728 WHERE \u8868\u8fbe\u5f0f\u4e2d\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 MySQL \u652f\u6301\u7684\u4efb\u4f55\u51fd\u6570\u548c\u64cd\u4f5c\u7b26\uff0c\u4f46\u805a\u5408\uff08\u7ec4\uff09\u51fd\u6570\u9664\u5916\u3002\n<\/p><\/blockquote>\n<p>\u56e0\u6b64\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u5404\u79cd\u51fd\u6570\u548c\u8fd0\u7b97\u7b26\u6765\u521b\u5efa\u590d\u6742\u7684 where \u6761\u4ef6\u3002\u6709\u5173\u8fd9\u4e9b\u8bed\u6cd5\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u67e5\u9605 MySQL \u6587\u6863\u4e2d\u7684\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u548c\u8fd0\u7b97\u7b26\u7ae0\u8282\u3002<\/p>\n<p>\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aMySQL where \u6761\u4ef6\u4ec5\u4e3a\u5b57\u6bb5\u65f6\uff0c\u4e3a\u4ec0\u4e48\u53ea\u8fd4\u56de\u6570\u5b57\u5f00\u5934\u7684\u6570\u636e\uff1f\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u5427\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>MySQL where \u6761\u4ef6\u4ec5\u4e3a&#46;&#46;&#46;<\/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-200676","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200676","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=200676"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200676\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200676"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200676"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}