{"id":12224,"date":"2023-04-26T16:19:05","date_gmt":"2023-04-26T08:19:05","guid":{"rendered":"https:\/\/fick707.com\/?p=12224"},"modified":"2023-06-25T14:42:16","modified_gmt":"2023-06-25T06:42:16","slug":"mysql-%e7%b4%a2%e5%bc%95%e7%89%b9%e6%80%a7%ef%bc%8cin","status":"publish","type":"post","link":"https:\/\/fick707.com\/?p=12224","title":{"rendered":"Mysql \u7d22\u5f15\u7279\u6027\uff0cIN"},"content":{"rendered":"\n

\u8f6c\u81ea\u8fd9\u4e2a\u5730\u65b9<\/a><\/p>\n\n\n\n

\u7ed3\u8bba\uff1aIN\u80af\u5b9a\u4f1a\u8d70\u7d22\u5f15\uff0c\u4f46\u662f\u5f53IN\u7684\u53d6\u503c\u8303\u56f4\u8f83\u5927\u65f6\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\uff0c\u8d70\u5168\u8868\u626b\u63cf<\/p>\n\n\n\n

navicat\u53ef\u89c6\u5316\u5de5\u5177\u4f7f\u7528explain\u51fd\u6570\u67e5\u770bsql\u6267\u884c\u4fe1\u606f<\/p>\n\n\n\n

\u573a\u666f1\uff1a\u5f53IN\u4e2d\u7684\u53d6\u503c\u53ea\u6709\u4e00\u4e2a\u4e3b\u952e\u65f6<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u6211\u4eec\u53ea\u9700\u8981\u6ce8\u610f\u4e00\u4e2a\u6700\u91cd\u8981\u7684type \u7684\u4fe1\u606f\u5f88\u660e\u663e\u7684\u63d0\u73b0\u662f\u5426\u7528\u5230\u7d22\u5f15\uff1a<\/p>\n\n\n\n

type\u7ed3\u679c\u503c\u4ece\u597d\u5230\u574f\u4f9d\u6b21\u662f\uff1a<\/p>\n\n\n\n

system > const > eq_ref > ref > fulltext > ref_or_null > index_merge > unique_subquery > index_subquery > range > index > ALL<\/p>\n\n\n\n

all:\u5168\u8868\u626b\u63cf<\/p>\n\n\n\n

index:\u53e6\u4e00\u79cd\u5f62\u5f0f\u7684\u5168\u8868\u626b\u63cf\uff0c\u53ea\u4e0d\u8fc7\u4ed6\u7684\u626b\u63cf\u65b9\u5f0f\u662f\u6309\u7167\u7d22\u5f15\u7684\u987a\u5e8f<\/p>\n\n\n\n

range\uff1a\u6709\u8303\u56f4\u7684\u7d22\u5f15\u626b\u63cf\uff0c\u76f8\u5bf9\u4e8eindex\u7684\u5168\u8868\u626b\u63cf\uff0c\u4ed6\u6709\u8303\u56f4\u9650\u5236\uff0c\u56e0\u6b64\u8981\u4f18\u4e8eindex<\/p>\n\n\n\n

ref: \u67e5\u627e\u6761\u4ef6\u5217\u4f7f\u7528\u4e86\u7d22\u5f15\u800c\u4e14\u4e0d\u4e3a\u4e3b\u952e\u548cunique\u3002\u5176\u5b9e\uff0c\u610f\u601d\u5c31\u662f\u867d\u7136\u4f7f\u7528\u4e86\u7d22\u5f15\uff0c\u4f46\u8be5\u7d22\u5f15\u5217\u7684\u503c\u5e76\u4e0d\u552f\u4e00\uff0c\u6709\u91cd\u590d\u3002\u8fd9\u6837\u5373\u4f7f\u4f7f\u7528\u7d22\u5f15\u5feb\u901f\u67e5\u627e\u5230\u4e86\u7b2c\u4e00\u6761\u6570\u636e\uff0c\u4ecd\u7136\u4e0d\u80fd\u505c\u6b62\uff0c\u8981\u8fdb\u884c\u76ee\u6807\u503c\u9644\u8fd1\u7684\u5c0f\u8303\u56f4\u626b\u63cf\u3002\u4f46\u5b83\u7684\u597d\u5904\u662f\u5b83\u5e76\u4e0d\u9700\u8981\u626b\u5168\u8868\uff0c\u56e0\u4e3a\u7d22\u5f15\u662f\u6709\u5e8f\u7684\uff0c\u5373\u4fbf\u6709\u91cd\u590d\u503c\uff0c\u4e5f\u662f\u5728\u4e00\u4e2a\u975e\u5e38\u5c0f\u7684\u8303\u56f4\u5185\u626b\u63cf\u3002<\/p>\n\n\n\n

const:\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u5c06\u4e00\u4e2a\u4e3b\u952e\u653e\u7f6e\u5230where\u540e\u9762\u4f5c\u4e3a\u6761\u4ef6\u67e5\u8be2\uff0cmysql\u4f18\u5316\u5668\u5c31\u80fd\u628a\u8fd9\u6b21\u67e5\u8be2\u4f18\u5316\u8f6c\u5316\u4e3a\u4e00\u4e2a\u5e38\u91cf\u3002\u81f3\u4e8e\u5982\u4f55\u8f6c\u5316\u4ee5\u53ca\u4f55\u65f6\u8f6c\u5316\uff0c\u8fd9\u4e2a\u53d6\u51b3\u4e8e\u4f18\u5316\u5668<\/p>\n\n\n\n

\u4e00\u822c\u6765\u8bf4\uff0c\u5f97\u4fdd\u8bc1\u67e5\u8be2\u81f3\u5c11\u8fbe\u5230range\u7ea7\u522b\uff0c\u6700\u597d\u80fd\u8fbe\u5230ref\uff0ctype\u51fa\u73b0index\u548call\u65f6\uff0c\u8868\u793a\u8d70\u7684\u662f\u5168\u8868\u626b\u63cf\u6ca1\u6709\u8d70\u7d22\u5f15\uff0c\u6548\u7387\u4f4e\u4e0b\uff0c\u8fd9\u65f6\u9700\u8981\u5bf9sql\u8fdb\u884c\u8c03\u4f18\u3002<\/p>\n\n\n\n

\u5f53extra\u51fa\u73b0Using filesor\u6216Using temproary\u65f6\uff0c\u8868\u793a\u65e0\u6cd5\u4f7f\u7528\u7d22\u5f15\uff0c\u5fc5\u987b\u5c3d\u5feb\u505a\u4f18\u5316\u3002<\/p>\n\n\n\n

possible_keys\uff1asql\u6240\u7528\u5230\u7684\u7d22\u5f15<\/p>\n\n\n\n

key\uff1a\u663e\u793aMySQL\u5b9e\u9645\u51b3\u5b9a\u4f7f\u7528\u7684\u952e\uff08\u7d22\u5f15\uff09\u3002\u5982\u679c\u6ca1\u6709\u9009\u62e9\u7d22\u5f15\uff0c\u952e\u662fNULL<\/p>\n\n\n\n

rows: \u663e\u793aMySQL\u8ba4\u4e3a\u5b83\u6267\u884c\u67e5\u8be2\u65f6\u5fc5\u987b\u68c0\u67e5\u7684\u884c\u6570\u3002<\/p>\n\n\n\n

\u573a\u666f2\uff1a\u6269\u5927IN\u4e2d\u7684\u53d6\u503c\u8303\u56f4<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u6b64\u65f6\u4ecd\u7136\u8d70\u4e86\u7d22\u5f15\uff0c\u4f46\u662f\u6548\u7387\u964d\u4f4e\u4e86<\/p>\n\n\n\n

\u573a\u666f3\uff1a\u7ee7\u7eed\u6269\u5927IN\u7684\u53d6\u503c\u8303\u56f4<\/p>\n\n\n\n

\"\"
\u53d1\u73b0\u6b64\u65f6\u5df2\u7ecf\u6ca1\u6709\u8d70\u7d22\u5f15\u4e86\uff0c\u800c\u662f\u5168\u8868\u626b\u63cf<\/figcaption><\/figure>\n\n\n\n

\u5728\u8bf4\u4e00\u4e0b\u7ed3\u8bba<\/p>\n\n\n\n

\u7ed3\u8bba<\/strong>\uff1aIN\u80af\u5b9a\u4f1a\u8d70\u7d22\u5f15\uff0c\u4f46\u662f\u5f53IN\u7684\u53d6\u503c\u8303\u56f4\u8f83\u5927\u65f6\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\uff0c\u8d70\u5168\u8868\u626b\u63cf\u3002<\/p>\n\n\n\n

By the way\uff1a\u5982\u679c\u4f7f\u7528\u4e86 not in\uff0c\u5219\u4e0d\u8d70\u7d22\u5f15\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u8f6c\u81ea\u8fd9\u4e2a\u5730\u65b9 \u7ed3\u8bba\uff1aIN\u80af\u5b9a\u4f1a\u8d70\u7d22\u5f15\uff0c\u4f46\u662f\u5f53IN\u7684\u53d6\u503c\u8303\u56f4\u8f83\u5927\u65f6\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\uff0c\u8d70\u5168\u8868\u626b\u63cf navi …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[21],"series":[],"class_list":["post-12224","post","type-post","status-publish","format-standard","hentry","category-programmers","tag-mysql"],"_links":{"self":[{"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/posts\/12224"}],"collection":[{"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fick707.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12224"}],"version-history":[{"count":2,"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/posts\/12224\/revisions"}],"predecessor-version":[{"id":12230,"href":"https:\/\/fick707.com\/index.php?rest_route=\/wp\/v2\/posts\/12224\/revisions\/12230"}],"wp:attachment":[{"href":"https:\/\/fick707.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12224"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fick707.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12224"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fick707.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12224"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/fick707.com\/index.php?rest_route=%2Fwp%2Fv2%2Fseries&post=12224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}