{"id":58,"date":"2023-02-21T08:45:00","date_gmt":"2023-02-21T08:45:00","guid":{"rendered":"https:\/\/blessingcr.com\/?p=58"},"modified":"2023-02-21T08:45:01","modified_gmt":"2023-02-21T08:45:01","slug":"%e4%bc%98%e5%8c%96%e5%bb%ba%e8%ae%ae","status":"publish","type":"post","link":"https:\/\/blessingcr.com\/?p=58","title":{"rendered":"\u4f18\u5316\u5efa\u8bae"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\" id=\"_2wBD6NHi\">\u5e38\u89c1\u7d22\u5f15\u5217\u5efa\u8bae<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u51fa\u73b0\u5728 SELECT\u3001UPDATE\u3001DELETE \u8bed\u53e5\u7684 WHERE \u4ece\u53e5\u4e2d\u7684\u5217<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5305\u542b\u5728 ORDER BY\u3001GROUP BY\u3001DISTINCT \u4e2d\u7684\u5b57\u6bb5<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5e76\u4e0d\u8981\u5c06\u7b26\u5408 1 \u548c 2 \u4e2d\u7684\u5b57\u6bb5\u7684\u5217\u90fd\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15\uff0c \u901a\u5e38\u5c06 1\u30012 \u4e2d\u7684\u5b57\u6bb5\u5efa\u7acb\u8054\u5408\u7d22\u5f15\u6548\u679c\u66f4\u597d<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u591a\u8868 join \u7684\u5173\u8054\u5217<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"_eXJT2odO\">\u5982\u4f55\u9009\u62e9\u7d22\u5f15\u5217\u7684\u987a\u5e8f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5efa\u7acb\u7d22\u5f15\u7684\u76ee\u7684\u662f\uff1a\u5e0c\u671b\u901a\u8fc7\u7d22\u5f15\u8fdb\u884c\u6570\u636e\u67e5\u627e\uff0c\u51cf\u5c11\u968f\u673a IO\uff0c\u589e\u52a0\u67e5\u8be2\u6027\u80fd \uff0c\u7d22\u5f15\u80fd\u8fc7\u6ee4\u51fa\u8d8a\u5c11\u7684\u6570\u636e\uff0c\u5219\u4ece\u78c1\u76d8\u4e2d\u8bfb\u5165\u7684\u6570\u636e\u4e5f\u5c31\u8d8a\u5c11\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u533a\u5206\u5ea6\u6700\u9ad8\u7684\u653e\u5728\u8054\u5408\u7d22\u5f15\u7684\u6700\u5de6\u4fa7\uff08\u533a\u5206\u5ea6=\u5217\u4e2d\u4e0d\u540c\u503c\u7684\u6570\u91cf\/\u5217\u7684\u603b\u884c\u6570\uff09<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5c3d\u91cf\u628a\u5b57\u6bb5\u957f\u5ea6\u5c0f\u7684\u5217\u653e\u5728\u8054\u5408\u7d22\u5f15\u7684\u6700\u5de6\u4fa7\uff08\u56e0\u4e3a\u5b57\u6bb5\u957f\u5ea6\u8d8a\u5c0f\uff0c\u4e00\u9875\u80fd\u5b58\u50a8\u7684\u6570\u636e\u91cf\u8d8a\u5927\uff0cIO \u6027\u80fd\u4e5f\u5c31\u8d8a\u597d\uff09<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u6700\u9891\u7e41\u7684\u5217\u653e\u5230\u8054\u5408\u7d22\u5f15\u7684\u5de6\u4fa7\uff08\u8fd9\u6837\u53ef\u4ee5\u6bd4\u8f83\u5c11\u7684\u5efa\u7acb\u4e00\u4e9b\u7d22\u5f15\uff09<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"_huXLK8aG\">\u4e00\u822c\u4e2a\u6570\u5efa\u8bae<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d22\u5f15\u4e0a\u9650\u4e3a16\/\u4e5f\u6709\u8bf465\u7684\uff08\u666e\u904d\u610f\u4e49\u4e0a\u6765\u8bf416\uff09\uff0c\u6700\u597d\u4e2a\u6570\u4e3a3-5\u4e2a\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"_pzhn6Shs\">\u963f\u91cc\u5f3a\u5236\u89c4\u8303<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">1.\u3010\u5f3a\u5236\u3011\u4e1a\u52a1\u4e0a\u5177\u6709\u552f\u4e00\u7279\u6027\u7684\u5b57\u6bb5\uff0c\u5373\u4f7f\u662f\u591a\u4e2a\u5b57\u6bb5\u7684\u7ec4\u5408\uff0c\u4e5f\u5fc5\u987b\u5efa\u6210\u552f\u4e00\u7d22\u5f15\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u8981\u4ee5\u4e3a\u552f\u4e00\u7d22\u5f15\u5f71\u54cd\u4e86 insert \u901f\u5ea6\uff0c\u8fd9\u4e2a\u901f\u5ea6\u635f\u8017\u53ef\u4ee5\u5ffd\u7565\uff0c\u4f46\u63d0\u9ad8\u67e5\u627e\u901f\u5ea6\u662f\u660e \u663e\u7684;\u53e6\u5916\uff0c\u5373\u4f7f\u5728\u5e94\u7528\u5c42\u505a\u4e86\u975e\u5e38\u5b8c\u5584\u7684\u6821\u9a8c\u63a7\u5236\uff0c\u53ea\u8981\u6ca1\u6709\u552f\u4e00\u7d22\u5f15\uff0c\u6839\u636e\u58a8\u83f2\u5b9a\u5f8b\uff0c\u5fc5 \u7136\u6709\u810f\u6570\u636e\u4ea7\u751f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2.\u3010\u5f3a\u5236\u3011\u8d85\u8fc7\u4e09\u4e2a\u8868\u7981\u6b62 join\u3002\u9700\u8981 join \u7684\u5b57\u6bb5\uff0c\u6570\u636e\u7c7b\u578b\u5fc5\u987b\u7edd\u5bf9\u4e00\u81f4;\u591a\u8868\u5173\u8054\u67e5\u8be2\u65f6\uff0c \u4fdd\u8bc1\u88ab\u5173\u8054\u7684\u5b57\u6bb5\u9700\u8981\u6709\u7d22\u5f15\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5373\u4f7f\u53cc\u8868 join \u4e5f\u8981\u6ce8\u610f\u8868\u7d22\u5f15\u3001SQL \u6027\u80fd\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3.\u3010\u5f3a\u5236\u3011\u5728 varchar \u5b57\u6bb5\u4e0a\u5efa\u7acb\u7d22\u5f15\u65f6\uff0c\u5fc5\u987b\u6307\u5b9a\u7d22\u5f15\u957f\u5ea6\uff0c\u6ca1\u5fc5\u8981\u5bf9\u5168\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\uff0c\u6839\u636e \u5b9e\u9645\u6587\u672c\u533a\u5206\u5ea6\u51b3\u5b9a\u7d22\u5f15\u957f\u5ea6\u5373\u53ef\u3002 \u8bf4\u660e:\u7d22\u5f15\u7684\u957f\u5ea6\u4e0e\u533a\u5206\u5ea6\u662f\u4e00\u5bf9\u77db\u76fe\u4f53\uff0c\u4e00\u822c\u5bf9\u5b57\u7b26\u4e32\u7c7b\u578b\u6570\u636e\uff0c\u957f\u5ea6\u4e3a 20 \u7684\u7d22\u5f15\uff0c\u533a\u5206\u5ea6\u4f1a\u9ad8\u8fbe 90%\u4ee5\u4e0a\uff0c\u53ef\u4ee5\u4f7f\u7528 count(distinct left(\u5217\u540d, \u7d22\u5f15\u957f\u5ea6))\/count(*)\u7684\u533a\u5206\u5ea6\u6765\u786e\u5b9a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4.\u3010\u5f3a\u5236\u3011\u9875\u9762\u641c\u7d22\u4e25\u7981\u5de6\u6a21\u7cca\u6216\u8005\u5168\u6a21\u7cca\uff0c\u5982\u679c\u9700\u8981\u8bf7\u8d70\u641c\u7d22\u5f15\u64ce\u6765\u89e3\u51b3\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d22\u5f15\u6587\u4ef6\u5177\u6709 B-Tree \u7684\u6700\u5de6\u524d\u7f00\u5339\u914d\u7279\u6027\uff0c\u5982\u679c\u5de6\u8fb9\u7684\u503c\u672a\u786e\u5b9a\uff0c\u90a3\u4e48\u65e0\u6cd5\u4f7f\u7528\u6b64\u7d22\u5f15\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"_S4AGNvxq\">\u963f\u91cc\u4f18\u5316\u89c4\u8303<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">5.\u3010\u63a8\u8350\u3011\u5982\u679c\u6709 order by \u7684\u573a\u666f\uff0c\u8bf7\u6ce8\u610f\u5229\u7528\u7d22\u5f15\u7684\u6709\u5e8f\u6027\u3002order by \u6700\u540e\u7684\u5b57\u6bb5\u662f\u7ec4\u5408\u7d22\u5f15\u7684\u4e00\u90e8\u5206\uff0c\u5e76\u4e14\u653e\u5728\u7d22\u5f15\u7ec4\u5408\u987a\u5e8f\u7684\u6700\u540e\uff0c\u907f\u514d\u51fa\u73b0 file_sort \u7684\u60c5\u51b5\uff0c\u5f71\u54cd\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b63\u4f8b:where a=? and b=? order by c; \u7d22\u5f15:a_b_c \u53cd\u4f8b:\u7d22\u5f15\u4e2d\u6709\u8303\u56f4\u67e5\u627e\uff0c\u90a3\u4e48\u7d22\u5f15\u6709\u5e8f\u6027\u65e0\u6cd5\u5229\u7528\uff0c\u5982:WHERE a&gt;10 ORDER BY b; \u7d22\u5f15 a_b \u65e0\u6cd5\u6392\u5e8f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">6.\u3010\u63a8\u8350\u3011\u5229\u7528\u8986\u76d6\u7d22\u5f15\u6765\u8fdb\u884c\u67e5\u8be2\u64cd\u4f5c\uff0c\u907f\u514d\u56de\u8868\u3002<br>\u8bf4\u660e:\u5982\u679c\u4e00\u672c\u4e66\u9700\u8981\u77e5\u9053\u7b2c11\u7ae0\u662f\u4ec0\u4e48\u6807\u9898\uff0c\u4f1a\u7ffb\u5f00\u7b2c11\u7ae0\u5bf9\u5e94\u7684\u90a3\u4e00\u9875\u5417?\u76ee\u5f55\u6d4f\u89c8\u4e00\u4e0b\u5c31\u597d\uff0c\u8fd9\u4e2a\u76ee\u5f55\u5c31\u662f\u8d77\u5230\u8986\u76d6\u7d22\u5f15\u7684\u4f5c\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b63\u4f8b:\u80fd\u591f\u5efa\u7acb\u7d22\u5f15\u7684\u79cd\u7c7b:\u4e3b\u952e\u7d22\u5f15\u3001\u552f\u4e00\u7d22\u5f15\u3001\u666e\u901a\u7d22\u5f15\uff0c\u800c\u8986\u76d6\u7d22\u5f15\u662f\u4e00\u79cd\u67e5\u8be2\u7684\u6548\u679c\uff0c\u7528explain\u7684\u7ed3\u679c\uff0cextra\u5217\u4f1a\u51fa\u73b0:using index\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">7.\u3010\u63a8\u8350\u3011\u5229\u7528\u5ef6\u8fdf\u5173\u8054\u6216\u8005\u5b50\u67e5\u8be2\u4f18\u5316\u8d85\u591a\u5206\u9875\u573a\u666f\u3002<br>\u8bf4\u660e:MySQL\u5e76\u4e0d\u662f\u8df3\u8fc7 offset \u884c\uff0c\u800c\u662f\u53d6 offset+N \u884c\uff0c\u7136\u540e\u8fd4\u56de\u653e\u5f03\u524d offset \u884c\uff0c\u8fd4\u56de N \u884c\uff0c\u90a3\u5f53 offset \u7279\u522b\u5927\u7684\u65f6\u5019\uff0c\u6548\u7387\u5c31\u975e\u5e38\u7684\u4f4e\u4e0b\uff0c\u8981\u4e48\u63a7\u5236\u8fd4\u56de\u7684\u603b\u9875\u6570\uff0c\u8981\u4e48\u5bf9\u8d85\u8fc7\u7279\u5b9a\u9608\u503c\u7684\u9875\u6570\u8fdb\u884c SQL \u6539\u5199\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b63\u4f8b:\u5148\u5feb\u901f\u5b9a\u4f4d\u9700\u8981\u83b7\u53d6\u7684 id \u6bb5\uff0c\u7136\u540e\u518d\u5173\u8054:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SELECT a.* FROM \u8868 1 a, (select id from \u8868 1 where \u6761\u4ef6 LIMIT 100000,20 ) b where a.id=b.id<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">8.\u3010\u63a8\u8350\u3011SQL \u6027\u80fd\u4f18\u5316\u7684\u76ee\u6807:\u81f3\u5c11\u8981\u8fbe\u5230 range \u7ea7\u522b\uff0c\u8981\u6c42\u662f ref \u7ea7\u522b\uff0c\u5982\u679c\u53ef\u4ee5\u662f consts \u6700\u597d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bf4\u660e:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>consts \u5355\u8868\u4e2d\u6700\u591a\u53ea\u6709\u4e00\u4e2a\u5339\u914d\u884c(\u4e3b\u952e\u6216\u8005\u552f\u4e00\u7d22\u5f15)\uff0c\u5728\u4f18\u5316\u9636\u6bb5\u5373\u53ef\u8bfb\u53d6\u5230\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ref \u6307\u7684\u662f\u4f7f\u7528\u666e\u901a\u7684\u7d22\u5f15(normal index)\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>range \u5bf9\u7d22\u5f15\u8fdb\u884c\u8303\u56f4\u68c0\u7d22\u3002<br>\u53cd\u4f8b:explain \u8868\u7684\u7ed3\u679c\uff0ctype=index\uff0c\u7d22\u5f15\u7269\u7406\u6587\u4ef6\u5168\u626b\u63cf\uff0c\u901f\u5ea6\u975e\u5e38\u6162\uff0c\u8fd9\u4e2a index \u7ea7 \u522b\u6bd4\u8f83 range \u8fd8\u4f4e\uff0c\u4e0e\u5168\u8868\u626b\u63cf\u662f\u5c0f\u5deb\u89c1\u5927\u5deb\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">9.\u3010\u63a8\u8350\u3011\u5efa\u7ec4\u5408\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u533a\u5206\u5ea6\u6700\u9ad8\u7684\u5728\u6700\u5de6\u8fb9\u3002<br>\u6b63\u4f8b:\u5982\u679c where a=? and b=? \uff0ca \u5217\u7684\u51e0\u4e4e\u63a5\u8fd1\u4e8e\u552f\u4e00\u503c\uff0c\u90a3\u4e48\u53ea\u9700\u8981\u5355\u5efa idx_a \u7d22\u5f15\u5373 \u53ef\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bf4\u660e:\u5b58\u5728\u975e\u7b49\u53f7\u548c\u7b49\u53f7\u6df7\u5408\u5224\u65ad\u6761\u4ef6\u65f6\uff0c\u5728\u5efa\u7d22\u5f15\u65f6\uff0c\u8bf7\u628a\u7b49\u53f7\u6761\u4ef6\u7684\u5217\u524d\u7f6e\u3002\u5982:where a&gt;? and b=? \u90a3\u4e48\u5373\u4f7f a \u7684\u533a\u5206\u5ea6\u66f4\u9ad8\uff0c\u4e5f\u5fc5\u987b\u628a b \u653e\u5728\u7d22\u5f15\u7684\u6700\u524d\u5217\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">10\u3010\u63a8\u8350\u3011\u9632\u6b62\u56e0\u5b57\u6bb5\u7c7b\u578b\u4e0d\u540c\u9020\u6210\u7684\u9690\u5f0f\u8f6c\u6362\uff0c\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">11.\u3010\u53c2\u8003\u3011\u521b\u5efa\u7d22\u5f15\u65f6\u907f\u514d\u6709\u5982\u4e0b\u6781\u7aef\u8bef\u89e3<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b81\u6ee5\u52ff\u7f3a\u3002\u8ba4\u4e3a\u4e00\u4e2a\u67e5\u8be2\u5c31\u9700\u8981\u5efa\u4e00\u4e2a\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b81\u7f3a\u52ff\u6ee5\u3002\u8ba4\u4e3a\u7d22\u5f15\u4f1a\u6d88\u8017\u7a7a\u95f4\u3001\u4e25\u91cd\u62d6\u6162\u66f4\u65b0\u548c\u65b0\u589e\u901f\u5ea6\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u62b5\u5236\u60df\u4e00\u7d22\u5f15\u3002\u8ba4\u4e3a\u4e1a\u52a1\u7684\u60df\u4e00\u6027\u4e00\u5f8b\u9700\u8981\u5728\u5e94\u7528\u5c42\u901a\u8fc7\u201c\u5148\u67e5\u540e\u63d2\u201d\u65b9\u5f0f\u89e3\u51b3\u3002<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"_C8YvWlxH\">\u989d\u5916\u63a8\u8350\uff1a<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">1\u3001\u7d22\u5f15\u5e76\u4e0d\u662f\u8d8a\u591a\u8d8a\u597d\uff0c\u8981\u6839\u636e\u67e5\u8be2\u6709\u9488\u5bf9\u6027\u7684\u521b\u5efa\uff0c\u8003\u8651\u5728WHERE\u548cORDER BY\u547d\u4ee4\u4e0a\u6d89\u53ca\u7684\u5217\u5efa\u7acb\u7d22\u5f15\uff0c\u53ef\u6839\u636eEXPLAIN\u6765\u67e5\u770b\u662f\u5426\u7528\u4e86\u7d22\u5f15\u8fd8\u662f\u5168\u8868\u626b\u63cf<\/p>\n\n\n\n<p 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