{"id":143863,"date":"2024-11-01T01:53:18","date_gmt":"2024-10-31T17:53:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143863\/"},"modified":"2024-11-01T01:53:19","modified_gmt":"2024-10-31T17:53:19","slug":"sql-%e6%8e%92%e5%ba%8f%ef%bc%9a%e5%84%aa%e5%8c%96%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%b5%90%e6%a7%8b%ef%bc%8c%e6%8f%90%e5%8d%87%e6%95%b8%e6%93%9a%e6%aa%a2%e7%b4%a2%e6%95%88%e7%8e%87-sql-%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143863\/","title":{"rendered":"SQL \u6392\u5e8f\uff1a\u512a\u5316\u6578\u64da\u5eab\u8868\u7d50\u69cb\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387 (sql \u6578\u64da\u5eab\u8868\u6392\u5e8f)"},"content":{"rendered":"<h1 id=\"sql-%e6%8e%92%e5%ba%8f%ef%bc%9a%e5%84%aa%e5%8c%96%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%b5%90%e6%a7%8b%ef%bc%8c%e6%8f%90%e5%8d%87%e6%95%b8%e6%93%9a%e6%aa%a2%e7%b4%a2%e6%95%88%e7%8e%87-MDpZxIGwRh\">SQL \u6392\u5e8f\uff1a\u512a\u5316\u6578\u64da\u5eab\u8868\u7d50\u69cb\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u4f5c\u70ba\u6700\u5e38\u7528\u7684\u6578\u64da\u5eab\u67e5\u8a62\u8a9e\u8a00\u4e4b\u4e00\uff0c\u5176\u6392\u5e8f\u529f\u80fd\u5728\u6578\u64da\u6aa2\u7d22\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u901a\u904e\u512a\u5316\u6578\u64da\u5eab\u8868\u7d50\u69cb\u4f86\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387\uff0c\u7279\u5225\u662f\u5728\u4f7f\u7528 SQL \u6392\u5e8f\u6642\u7684\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"sql-%e6%8e%92%e5%ba%8f%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-MDpZxIGwRh\">SQL \u6392\u5e8f\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>SQL \u4e2d\u7684\u6392\u5e8f\u4e3b\u8981\u662f\u901a\u904e <code>ORDER BY<\/code> \u5b50\u53e5\u4f86\u5be6\u73fe\u7684\u3002\u9019\u500b\u5b50\u53e5\u5141\u8a31\u7528\u6236\u6839\u64da\u4e00\u500b\u6216\u591a\u500b\u5217\u7684\u503c\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002\u6392\u5e8f\u53ef\u4ee5\u662f\u5347\u5e8f\uff08<code>ASC<\/code>\uff09\u6216\u964d\u5e8f\uff08<code>DESC<\/code>\uff09\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u6839\u64da\u7528\u6236\u7684\u8a3b\u518a\u65e5\u671f\u5c0d\u7528\u6236\u8868\u9032\u884c\u6392\u5e8f\uff1a<\/p>\n<pre><code>SELECT * FROM users ORDER BY registration_date DESC;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u80fd\u5920\u5feb\u901f\u8fd4\u56de\u6700\u65b0\u8a3b\u518a\u7684\u7528\u6236\uff0c\u4f46\u5728\u6578\u64da\u91cf\u9f90\u5927\u7684\u60c5\u6cc1\u4e0b\uff0c\u6392\u5e8f\u64cd\u4f5c\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u74f6\u9838\u3002<\/p>\n<h2 id=\"%e5%84%aa%e5%8c%96%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%b5%90%e6%a7%8b-MDpZxIGwRh\">\u512a\u5316\u6578\u64da\u5eab\u8868\u7d50\u69cb<\/h2>\n<p>\u70ba\u4e86\u63d0\u5347 SQL \u6392\u5e8f\u7684\u6548\u7387\uff0c\u9996\u5148\u9700\u8981\u512a\u5316\u6578\u64da\u5eab\u8868\u7684\u7d50\u69cb\u3002\u4ee5\u4e0b\u662f\u5e7e\u500b\u95dc\u9375\u7684\u512a\u5316\u7b56\u7565\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-MDpZxIGwRh\">1. \u4f7f\u7528\u7d22\u5f15<\/h3>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u6709\u6548\u5de5\u5177\u3002\u5c0d\u65bc\u7d93\u5e38\u7528\u65bc\u6392\u5e8f\u7684\u5217\uff0c\u61c9\u8003\u616e\u5275\u5efa\u7d22\u5f15\u3002\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u6578\u64da\u6aa2\u7d22\u7684\u6642\u9593\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u4e0a\u8ff0\u7528\u6236\u8868\uff0c\u5982\u679c\u7d93\u5e38\u6839\u64da <code>registration_date<\/code> \u9032\u884c\u6392\u5e8f\uff0c\u53ef\u4ee5\u9019\u6a23\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_registration_date ON users (registration_date);<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u6578\u64da\u5eab\u5728\u57f7\u884c\u6392\u5e8f\u6642\u53ef\u4ee5\u5229\u7528\u7d22\u5f15\uff0c\u5f9e\u800c\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<h3 id=\"2-%e9%81%a9%e7%95%b6%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-MDpZxIGwRh\">2. \u9069\u7576\u7684\u6578\u64da\u985e\u578b<\/h3>\n<p>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u4e5f\u80fd\u5f71\u97ff\u6392\u5e8f\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 <code>DATETIME<\/code> \u985e\u578b\u4f86\u5b58\u5132\u65e5\u671f\u6642\u9593\u4fe1\u606f\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u5b57\u7b26\u4e32\u985e\u578b\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u6392\u5e8f\u7684\u6548\u7387\u3002\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u9032\u884c\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u985e\u578b\u8f49\u63db\u3002<\/p>\n<h3 id=\"3-%e5%88%86%e5%8d%80%e8%a1%a8-MDpZxIGwRh\">3. \u5206\u5340\u8868<\/h3>\n<p>\u5c0d\u65bc\u975e\u5e38\u5927\u7684\u6578\u64da\u96c6\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u5206\u5340\u8868\u3002\u5206\u5340\u8868\u5c07\u6578\u64da\u5206\u6563\u5230\u591a\u500b\u7269\u7406\u5340\u57df\u4e2d\uff0c\u9019\u6a23\u5728\u9032\u884c\u6392\u5e8f\u6642\uff0c\u6578\u64da\u5eab\u53ea\u9700\u8655\u7406\u76f8\u95dc\u7684\u5206\u5340\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u6839\u64da\u5e74\u4efd\u5c0d\u7528\u6236\u6578\u64da\u9032\u884c\u5206\u5340\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id INT,\n    name VARCHAR(100),\n    registration_date DATETIME\n) PARTITION BY RANGE (YEAR(registration_date)) (\n    PARTITION p2021 VALUES LESS THAN (2022),\n    PARTITION p2022 VALUES LESS THAN (2023)\n);<\/code><\/pre>\n<h2 id=\"sql-%e6%8e%92%e5%ba%8f%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-MDpZxIGwRh\">SQL \u6392\u5e8f\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u9664\u4e86\u512a\u5316\u6578\u64da\u5eab\u8868\u7d50\u69cb\u5916\uff0c\u9084\u6709\u4e00\u4e9b SQL \u6392\u5e8f\u7684\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u9075\u5faa\uff1a<\/p>\n<ul>\n<li><strong>\u907f\u514d\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u4f7f\u7528 <code>SELECT *<\/code><\/strong>\uff1a\u53ea\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u7684\u8ca0\u64d4\u3002<\/li>\n<li><strong>\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578<\/strong>\uff1a\u4f7f\u7528 <code>LIMIT<\/code> \u5b50\u53e5\u4f86\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u6392\u5e8f\u6642\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u8003\u616e\u4f7f\u7528\u7269\u5316\u8996\u5716<\/strong>\uff1a\u5c0d\u65bc\u7d93\u5e38\u67e5\u8a62\u7684\u6392\u5e8f\u7d50\u679c\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u7269\u5316\u8996\u5716\u4f86\u9810\u5148\u8a08\u7b97\u548c\u5b58\u5132\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-MDpZxIGwRh\">\u7e3d\u7d50<\/h2>\n<p>\u901a\u904e\u512a\u5316\u6578\u64da\u5eab\u8868\u7d50\u69cb\u548c\u9075\u5faa SQL \u6392\u5e8f\u7684\u6700\u4f73\u5be6\u8e10\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\u3002\u7121\u8ad6\u662f\u4f7f\u7528\u7d22\u5f15\u3001\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\uff0c\u9084\u662f\u8003\u616e\u5206\u5340\u8868\uff0c\u9019\u4e9b\u7b56\u7565\u90fd\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u5728\u9762\u5c0d\u9f90\u5927\u6578\u64da\u6642\u4fdd\u6301\u9ad8\u6548\u7684\u67e5\u8a62\u6027\u80fd\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u6027\u548c\u5feb\u901f\u97ff\u61c9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u512a\u5316 SQL \u6578\u64da\u5eab\u8868\u7d50\u69cb\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387\uff0c\u638c\u63e1\u6392\u5e8f\u6280\u5de7\uff0c\u8b93\u67e5\u8a62\u66f4\u5feb\u901f\u3001\u6e96\u78ba\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-143863","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143863","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=143863"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143863\/revisions"}],"predecessor-version":[{"id":143864,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143863\/revisions\/143864"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143863"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143863"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}