{"id":76024,"date":"2024-10-16T03:13:35","date_gmt":"2024-10-15T19:13:35","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76024\/"},"modified":"2024-10-16T03:13:35","modified_gmt":"2024-10-15T19:13:35","slug":"mysql-%e6%8a%80%e5%b7%a7%e7%b5%90%e5%90%88%e7%9b%b8%e9%97%9c%e5%8f%83%e6%95%b8%e5%81%9a%e5%a5%bdlimit%e5%84%aa%e5%8c%96","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76024\/","title":{"rendered":"MySQL \u6280\u5de7:\u7d50\u5408\u76f8\u95dc\u53c3\u6578\u505a\u597dLimit\u512a\u5316"},"content":{"rendered":"<h1 id=\"mysql-%e6%8a%80%e5%b7%a7%e7%b5%90%e5%90%88%e7%9b%b8%e9%97%9c%e5%8f%83%e6%95%b8%e5%81%9a%e5%a5%bdlimit%e5%84%aa%e5%8c%96-SsklMzczRr\">MySQL \u6280\u5de7:\u7d50\u5408\u76f8\u95dc\u53c3\u6578\u505a\u597dLimit\u512a\u5316<\/h1>\n<p>\u5728\u4f7f\u7528 MySQL \u6578\u64da\u5eab\u6642\uff0c\u67e5\u8a62\u6027\u80fd\u7684\u512a\u5316\u662f\u6bcf\u4f4d\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u5fc5\u9808\u9762\u5c0d\u7684\u91cd\u8981\u8ab2\u984c\u3002\u5c24\u5176\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u5982\u4f55\u6709\u6548\u5730\u4f7f\u7528 LIMIT \u8a9e\u53e5\u4f86\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u6578\u91cf\uff0c\u4e26\u7d50\u5408\u5176\u4ed6\u53c3\u6578\u9032\u884c\u512a\u5316\uff0c\u5c07\u76f4\u63a5\u5f71\u97ff\u5230\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u548c\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n<h2 id=\"limit-%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e7%94%a8%e6%b3%95-SsklMzczRr\">LIMIT \u8a9e\u53e5\u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n<p>LIMIT \u8a9e\u53e5\u7528\u65bc\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\uff0c\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT * FROM \u8868\u540d LIMIT \u6578\u91cf;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u8868\u4e2d\u7372\u53d6\u524d 10 \u689d\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM users LIMIT 10;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e5%90%88-offset-%e5%8f%83%e6%95%b8-SsklMzczRr\">\u7d50\u5408 OFFSET \u53c3\u6578<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684 LIMIT \u8a9e\u53e5\uff0cMySQL \u9084\u652f\u6301 OFFSET \u53c3\u6578\uff0c\u9019\u4f7f\u5f97\u6211\u5011\u53ef\u4ee5\u5f9e\u7279\u5b9a\u7684\u884c\u958b\u59cb\u8fd4\u56de\u7d50\u679c\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT * FROM \u8868\u540d LIMIT \u6578\u91cf OFFSET \u504f\u79fb\u91cf;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e <code>users<\/code> \u8868\u4e2d\u7372\u53d6\u7b2c 11 \u5230\u7b2c 20 \u689d\u8a18\u9304\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT * FROM users LIMIT 10 OFFSET 10;<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95%e6%8f%90%e5%8d%87%e6%9f%a5%e8%a9%a2%e6%80%a7%e8%83%bd-SsklMzczRr\">\u4f7f\u7528\u7d22\u5f15\u63d0\u5347\u67e5\u8a62\u6027\u80fd<\/h2>\n<p>\u5728\u4f7f\u7528 LIMIT \u8a9e\u53e5\u6642\uff0c\u7d22\u5f15\u7684\u4f7f\u7528\u81f3\u95dc\u91cd\u8981\u3002\u7576\u67e5\u8a62\u7684\u8868\u4e2d\u6709\u9069\u7576\u7684\u7d22\u5f15\u6642\uff0cMySQL \u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li><strong>\u70ba\u67e5\u8a62\u689d\u4ef6\u6dfb\u52a0\u7d22\u5f15\uff1a<\/strong>\u5982\u679c\u67e5\u8a62\u4e2d\u6709 WHERE \u689d\u4ef6\uff0c\u78ba\u4fdd\u76f8\u95dc\u5b57\u6bb5\u6709\u7d22\u5f15\u3002<\/li>\n<li><strong>\u4f7f\u7528\u8986\u84cb\u7d22\u5f15\uff1a<\/strong>\u5982\u679c\u67e5\u8a62\u53ea\u6d89\u53ca\u7d22\u5f15\u4e2d\u7684\u5b57\u6bb5\uff0c\u5247\u53ef\u4ee5\u907f\u514d\u56de\u8868\u67e5\u8a62\uff0c\u9032\u4e00\u6b65\u63d0\u5347\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%81%bf%e5%85%8d%e4%bd%bf%e7%94%a8-select-SsklMzczRr\">\u907f\u514d\u4f7f\u7528 SELECT *<\/h2>\n<p>\u5728\u67e5\u8a62\u6642\uff0c\u76e1\u91cf\u907f\u514d\u4f7f\u7528 <code>SELECT *<\/code>\uff0c\u56e0\u70ba\u9019\u6703\u5c0e\u81f4 MySQL \u8fd4\u56de\u6240\u6709\u5217\uff0c\u589e\u52a0\u4e86\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u548c\u8655\u7406\u6642\u9593\u3002\u61c9\u8a72\u660e\u78ba\u6307\u5b9a\u9700\u8981\u7684\u5217\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT id, name FROM users LIMIT 10;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e5%90%88-order-by-%e9%80%b2%e8%a1%8c%e6%8e%92%e5%ba%8f-SsklMzczRr\">\u7d50\u5408 ORDER BY \u9032\u884c\u6392\u5e8f<\/h2>\n<p>\u5728\u4f7f\u7528 LIMIT \u6642\uff0c\u901a\u5e38\u9700\u8981\u5c0d\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002\u9019\u6642\uff0c<code>ORDER BY<\/code> \u5b50\u53e5\u7684\u4f7f\u7528\u4e5f\u6703\u5f71\u97ff\u6027\u80fd\u3002\u78ba\u4fdd\u5c0d\u6392\u5e8f\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\uff0c\u9019\u6a23\u53ef\u4ee5\u52a0\u5feb\u6392\u5e8f\u7684\u901f\u5ea6\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users ORDER BY created_at DESC LIMIT 10;<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8-explain-%e5%88%86%e6%9e%90%e6%9f%a5%e8%a9%a2-SsklMzczRr\">\u4f7f\u7528 EXPLAIN \u5206\u6790\u67e5\u8a62<\/h2>\n<p>\u70ba\u4e86\u9032\u4e00\u6b65\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>EXPLAIN<\/code> \u8a9e\u53e5\u4f86\u5206\u6790\u67e5\u8a62\u8a08\u5283\u3002\u9019\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u4e86\u89e3 MySQL \u5982\u4f55\u57f7\u884c\u67e5\u8a62\uff0c\u4e26\u627e\u51fa\u6f5b\u5728\u7684\u6027\u80fd\u74f6\u9838\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>EXPLAIN SELECT * FROM users ORDER BY created_at DESC LIMIT 10;<\/code><\/pre>\n<p>\u901a\u904e\u5206\u6790\u7d50\u679c\uff0c\u6211\u5011\u53ef\u4ee5\u770b\u5230\u662f\u5426\u4f7f\u7528\u4e86\u7d22\u5f15\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u8abf\u6574\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-SsklMzczRr\">\u7e3d\u7d50<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u5408\u7406\u4f7f\u7528 LIMIT \u8a9e\u53e5\u7d50\u5408\u5176\u4ed6\u53c3\u6578\u548c\u6700\u4f73\u5be6\u8e10\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u3002\u901a\u904e\u4f7f\u7528\u7d22\u5f15\u3001\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5217\u9078\u64c7\u3001\u7d50\u5408\u6392\u5e8f\u4ee5\u53ca\u4f7f\u7528 EXPLAIN \u9032\u884c\u67e5\u8a62\u5206\u6790\uff0c\u6211\u5011\u80fd\u5920\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u512a\u5316\u6578\u64da\u5eab\u67e5\u8a62\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u60a8\u7684\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u6280\u5de7\uff0c\u5b78\u7fd2\u5982\u4f55\u7d50\u5408\u76f8\u95dc\u53c3\u6578\u9032\u884cLimit\u512a\u5316\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u8b93\u6578\u64da\u8655\u7406\u66f4\u6d41\u66a2\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-76024","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76024","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=76024"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76024\/revisions"}],"predecessor-version":[{"id":76025,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76024\/revisions\/76025"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76024"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76024"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76024"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}