{"id":1933,"date":"2020-07-29T21:18:49","date_gmt":"2020-07-29T13:18:49","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1933"},"modified":"2020-07-29T21:18:49","modified_gmt":"2020-07-29T13:18:49","slug":"mysql-limit-%e5%88%86%e9%a1%b5%e4%bc%98%e5%8c%96","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1933","title":{"rendered":"MySQL limit \u5206\u9875\u4f18\u5316"},"content":{"rendered":"
\nMySQL limit \u5b50\u53e5\u53ef\u4ee5\u5b9e\u73b0\u5206\u9875\u67e5\u8be2\uff0c\u6bd4\u5982limit 100,10 \u53d6\u504f\u79fb100\u6761\u8bb0\u5f55\u4e4b\u540e\u768410\u6761\u8bb0\u5f55\u3002limit \u5b50\u53e5\u5728\u63d0\u4f9b\u4fbf\u6377\u5206\u9875\u529f\u80fd\u7684\u540c\u65f6\uff0c\u4e5f\u5e26\u6765\u4e86\u6027\u80fd\u95ee\u9898\uff0c\u5f53\u8868\u6570\u636e\u91cf\u975e\u5e38\u5927\uff0c\u5206\u9875\u6570\u975e\u5e38\u591a\uff0c\u67e5\u8be2\u6bd4\u8f83\u9760\u540e\u7684\u9875\u65f6\uff0cSQL\u6267\u884c\u6027\u80fd\u975e\u5e38\u5dee\u3002\n<\/div>\n
\n
\n
\u4f18\u5316\u65b9\u6cd5\u4e00\uff0c\u6539\u5199SQL<\/h5>\n

\u770b\u4e00\u4e2a\u4f8b\u5b50\uff0c\u4e00\u5f20\u8868\uff0c\u670964w\u591a\u6761\u8bb0\u5f55\u3002<\/p>\n

mysql> select count(*) from sbtest2;\n+----------+\n| count(*) |\n+----------+\n|\u00a0\u00a0 640133 |\n+----------+\n1 row in set (2.67 sec)\n<\/pre>\n
\u67e5\u8be250w\u4e4b\u540e\u768410\u6761\u8bb0\u5f55\uff0c\u8017\u65f65.06\u79d2\uff0c\u5982\u4e0b\uff1a<\/p>\n
mysql> select * from sbtest2 order by id limit 500000,10;\n...\n10 rows in set (5.06 sec)\n<\/pre>\n
\u6362\u4e00\u79cd\u5199\u6cd5\uff0c\u8017\u65f63.81\u79d2\uff0c\u660e\u663e\u4f18\u4e8e\u524d\u4e00\u79cd\u5199\u6cd5\uff0c\u5982\u4e0b\uff1a<\/p>\n
mysql> select * from sbtest2 t1, (select id from sbtest2 order by id limit 500000,10) t2 where t1.id=t2.id;\n...\n10 rows in set (3.81 sec)\n<\/pre>\n
\u6362\u4e00\u79cd\u5199\u6cd5\uff0c\u4f7f\u7528\u4e86\u5b50\u67e5\u8be2\uff0c\u5b50\u67e5\u8be2\u4e2d\u901a\u8fc7id\u6240\u5728\u7d22\u5f15\uff08\u4e3b\u952e\u6216\u8f85\u52a9\u7d22\u5f15\uff09\u626b\u63cf\uff0c\u5c06\u9700\u8981\u768410\u6761\u8bb0\u5f55\u7684id\u68c0\u7d22\u51fa\u6765\uff0c\u7136\u540e\u518d\u8fdb\u884c\u8868\u5173\u8054\uff0c\u67e5\u51fa10\u6761\u8bb0\u5f55\u7684\u5b8c\u6574\u4fe1\u606f\uff0c\u907f\u514d\u4e8650w\u6761\u6570\u636e\u7531InnoDB\u5b58\u50a8\u5f15\u64ce\u4f20\u9012\u7ed9MySQL Server\u5c42\u7684IO\u6d88\u8017\uff0c\u4ece\u800c\u63d0\u5347\u6027\u80fd\u3002
\noffset\u8d8a\u5927\uff0c\u68c0\u7d22\u5b57\u6bb5\u8d8a\u591a\uff0c\u8fd9\u79cd\u5199\u6cd5\u7684\u6027\u80fd\u63d0\u5347\u8d8a\u660e\u663e\u3002<\/p>\n
\u4f18\u5316\u65b9\u6cd5\u4e8c\uff0c\u8bb0\u5f55\u6700\u5927\u6700\u5c0fid<\/h5>\n
\u7a0b\u5e8f\u8bb0\u5f55\u6bcf\u4e2a\u5206\u9875\u7684\u6700\u5927\u548c\u6700\u5c0fid\uff0c\u7ffb\u9875\u65f6\u6839\u636e\u4e0a\u4e00\u9875\u7684\u6700\u5927\uff0c\u6700\u5c0fid\u6765\u68c0\u7d22\u8bb0\u5f55\uff0c\u53ef\u4ee5\u907f\u514d\u5927\u91cf\u65e0\u6548\u7684\u6570\u636e\u68c0\u7d22\u6d88\u8017\uff0c\u5982\u4e0b\u6240\u793a\uff1a
\nselect * from sbtest2 where id > $max_id order by id limit 10;
\nselect * from sbtest2 where id < $mim_id order by id desc limit 10;
\n\u8fd9\u79cd\u65b9\u5f0f\uff0c\u7531\u4e8e\u80fd\u591f\u6309id\u8d70\u7d22\u5f15\uff0cSQL\u6267\u884c\u6027\u80fd\u975e\u5e38\u5feb\u3002\n<\/p><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
MySQL limit \u5b50\u53e5\u53ef\u4ee5\u5b9e\u73b0\u5206\u9875\u67e5\u8be2\uff0c\u6bd4\u5982limit 100,10 \u53d6\u504f\u79fb100\u6761\u8bb0\u5f55\u4e4b\u540e\u768410\u6761\u8bb0\u5f55 …<\/p>\n
  MySQL limit \u5206\u9875\u4f18\u5316<\/span> \u67e5\u770b\u5168\u6587 »<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[90,88],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"MySQL limit \u5b50\u53e5\u53ef\u4ee5\u5b9e\u73b0\u5206\u9875\u67e5\u8be2\uff0c\u6bd4\u5982limit 100,10 \u53d6\u504f\u79fb100\u6761\u8bb0\u5f55\u4e4b\u540e\u768410\u6761\u8bb0\u5f55…","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1933"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1933"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1933\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1933"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1933"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}