{"id":143747,"date":"2024-11-01T00:54:20","date_gmt":"2024-10-31T16:54:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143747\/"},"modified":"2024-11-01T00:54:21","modified_gmt":"2024-10-31T16:54:21","slug":"sql-%e6%9f%a5%e8%a9%a2%e8%b6%85%e9%81%8e%e5%ae%b9%e9%87%8f%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9a%e5%a6%82%e4%bd%95%e8%a7%a3%e6%b1%ba%ef%bc%9f%ef%bc%88sql-%e6%9f%a5%e8%a9%a2%e8%b6%85%e9%81%8e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143747\/","title":{"rendered":"SQL \u67e5\u8a62\u8d85\u904e\u5bb9\u91cf\u7684\u6578\u64da\u5eab\uff1a\u5982\u4f55\u89e3\u6c7a\uff1f\uff08sql \u67e5\u8a62\u8d85\u904e\u7684\u6578\u64da\u5eab\uff09"},"content":{"rendered":"<h1 id=\"sql-%e6%9f%a5%e8%a9%a2%e8%b6%85%e9%81%8e%e5%ae%b9%e9%87%8f%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9a%e5%a6%82%e4%bd%95%e8%a7%a3%e6%b1%ba%ef%bc%9f-vIKReSSVcC\">SQL \u67e5\u8a62\u8d85\u904e\u5bb9\u91cf\u7684\u6578\u64da\u5eab\uff1a\u5982\u4f55\u89e3\u6c7a\uff1f<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u67e5\u8a62\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u8a31\u591a\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u53ef\u80fd\u6703\u9047\u5230\u67e5\u8a62\u8d85\u904e\u5bb9\u91cf\u7684\u554f\u984c\u3002\u9019\u4e0d\u50c5\u5f71\u97ff\u7cfb\u7d71\u6027\u80fd\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u4e1f\u5931\u6216\u640d\u58de\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u6709\u6548\u89e3\u6c7a\u9019\u4e00\u554f\u984c\u3002<\/p>\n<h2 id=\"%e7%90%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ae%b9%e9%87%8f%e9%99%90%e5%88%b6-vIKReSSVcC\">\u7406\u89e3\u6578\u64da\u5eab\u5bb9\u91cf\u9650\u5236<\/h2>\n<p>\u6bcf\u500b\u6578\u64da\u5eab\u7cfb\u7d71\u90fd\u6709\u5176\u5bb9\u91cf\u9650\u5236\uff0c\u9019\u4e9b\u9650\u5236\u53ef\u80fd\u4f86\u81ea\u65bc\u786c\u9ad4\u8cc7\u6e90\u3001\u6578\u64da\u5eab\u8a2d\u8a08\u6216\u914d\u7f6e\u8a2d\u5b9a\u3002\u4f8b\u5982\uff0c\u67d0\u4e9b\u95dc\u806f\u6578\u64da\u5eab\uff08\u5982 MySQL \u548c PostgreSQL\uff09\u5c0d\u55ae\u500b\u8868\u7684\u884c\u6578\u548c\u6578\u64da\u5927\u5c0f\u6709\u660e\u78ba\u7684\u9650\u5236\u3002\u4e86\u89e3\u9019\u4e9b\u9650\u5236\u662f\u89e3\u6c7a\u554f\u984c\u7684\u7b2c\u4e00\u6b65\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e7%9a%84%e5%ae%b9%e9%87%8f%e8%b6%85%e9%81%8e%e5%95%8f%e9%a1%8c-vIKReSSVcC\">\u5e38\u898b\u7684\u5bb9\u91cf\u8d85\u904e\u554f\u984c<\/h2>\n<ul>\n<li><strong>\u67e5\u8a62\u8d85\u6642\uff1a<\/strong>\u7576\u67e5\u8a62\u7684\u6578\u64da\u91cf\u904e\u5927\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u67e5\u8a62\u8d85\u6642\uff0c\u5f9e\u800c\u7121\u6cd5\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u5167\u5b58\u4e0d\u8db3\uff1a<\/strong>\u67e5\u8a62\u904e\u591a\u6578\u64da\u53ef\u80fd\u6703\u5c0e\u81f4\u5167\u5b58\u4e0d\u8db3\uff0c\u5f71\u97ff\u6574\u500b\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002<\/li>\n<li><strong>\u78c1\u789f\u7a7a\u9593\u4e0d\u8db3\uff1a<\/strong>\u5982\u679c\u6578\u64da\u5eab\u7684\u78c1\u789f\u7a7a\u9593\u4e0d\u8db3\uff0c\u5c07\u7121\u6cd5\u5b58\u5132\u65b0\u7684\u6578\u64da\u6216\u57f7\u884c\u67e5\u8a62\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-vIKReSSVcC\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<h3 id=\"1-%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2-vIKReSSVcC\">1. \u512a\u5316\u67e5\u8a62<\/h3>\n<p>\u512a\u5316 SQL \u67e5\u8a62\u662f\u89e3\u6c7a\u5bb9\u91cf\u554f\u984c\u7684\u9996\u8981\u6b65\u9a5f\u3002\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE INDEX idx_column_name ON table_name(column_name);<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u907f\u514d\u4f7f\u7528 SELECT *\uff0c\u800c\u662f\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u67e5\u8a62\u8fd4\u56de\u7684\u6578\u64da\u91cf\u3002<\/p>\n<h3 id=\"2-%e5%88%86%e9%a0%81%e6%9f%a5%e8%a9%a2-vIKReSSVcC\">2. \u5206\u9801\u67e5\u8a62<\/h3>\n<p>\u5c0d\u65bc\u9700\u8981\u8655\u7406\u5927\u91cf\u6578\u64da\u7684\u67e5\u8a62\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u5206\u9801\u6280\u8853\u3002\u9019\u6a23\u53ef\u4ee5\u5c07\u67e5\u8a62\u7d50\u679c\u5206\u6210\u591a\u500b\u5c0f\u90e8\u5206\uff0c\u6e1b\u5c11\u4e00\u6b21\u6027\u52a0\u8f09\u7684\u6578\u64da\u91cf\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM table_name LIMIT 10 OFFSET 0;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u53ea\u8fd4\u56de\u524d 10 \u689d\u8a18\u9304\uff0c\u5f9e\u800c\u6e1b\u5c11\u7cfb\u7d71\u8ca0\u64d4\u3002<\/p>\n<h3 id=\"3-%e6%95%b8%e6%93%9a%e6%b8%85%e7%90%86-vIKReSSVcC\">3. \u6578\u64da\u6e05\u7406<\/h3>\n<p>\u5b9a\u671f\u6e05\u7406\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u53ef\u4ee5\u6709\u6548\u91cb\u653e\u6578\u64da\u5eab\u7a7a\u9593\u3002\u53ef\u4ee5\u4f7f\u7528 DELETE \u8a9e\u53e5\u522a\u9664\u904e\u671f\u6216\u4e0d\u518d\u9700\u8981\u7684\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>DELETE FROM table_name WHERE created_at &lt; NOW() - INTERVAL 30 DAY;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u64cd\u4f5c\u53ef\u4ee5\u522a\u9664 30 \u5929\u524d\u7684\u6578\u64da\uff0c\u5f9e\u800c\u91cb\u653e\u7a7a\u9593\u3002<\/p>\n<h3 id=\"4-%e5%a2%9e%e5%8a%a0%e7%a1%ac%e9%ab%94%e8%b3%87%e6%ba%90-vIKReSSVcC\">4. \u589e\u52a0\u786c\u9ad4\u8cc7\u6e90<\/h3>\n<p>\u5982\u679c\u4ee5\u4e0a\u65b9\u6cd5\u7121\u6cd5\u89e3\u6c7a\u554f\u984c\uff0c\u53ef\u80fd\u9700\u8981\u8003\u616e\u589e\u52a0\u786c\u9ad4\u8cc7\u6e90\uff0c\u4f8b\u5982\u64f4\u5c55\u5167\u5b58\u6216\u78c1\u789f\u7a7a\u9593\u3002\u9019\u53ef\u4ee5\u901a\u904e\u5347\u7d1a\u4f3a\u670d\u5668\u6216\u4f7f\u7528\u96f2\u670d\u52d9\u4f86\u5be6\u73fe\u3002<\/p>\n<h3 id=\"5-%e4%bd%bf%e7%94%a8%e5%88%86%e5%b8%83%e5%bc%8f%e6%95%b8%e6%93%9a%e5%ba%ab-vIKReSSVcC\">5. \u4f7f\u7528\u5206\u5e03\u5f0f\u6578\u64da\u5eab<\/h3>\n<p>\u5c0d\u65bc\u5927\u578b\u61c9\u7528\uff0c\u8003\u616e\u4f7f\u7528\u5206\u5e03\u5f0f\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u5982 Apache Cassandra \u6216 Google Bigtable\uff0c\u9019\u4e9b\u7cfb\u7d71\u80fd\u5920\u8655\u7406\u66f4\u5927\u898f\u6a21\u7684\u6578\u64da\u4e26\u63d0\u4f9b\u66f4\u9ad8\u7684\u53ef\u64f4\u5c55\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-vIKReSSVcC\">\u7e3d\u7d50<\/h2>\n<p>\u67e5\u8a62\u8d85\u904e\u5bb9\u91cf\u7684\u6578\u64da\u5eab\u554f\u984c\u662f\u8a31\u591a\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9762\u81e8\u7684\u6311\u6230\u3002\u901a\u904e\u512a\u5316\u67e5\u8a62\u3001\u5be6\u65bd\u5206\u9801\u3001\u5b9a\u671f\u6e05\u7406\u6578\u64da\u3001\u589e\u52a0\u786c\u9ad4\u8cc7\u6e90\u4ee5\u53ca\u8003\u616e\u5206\u5e03\u5f0f\u6578\u64da\u5eab\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u89e3\u6c7a\u9019\u4e00\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\u9ad8\u6548\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u670d\u52d9\u5c07\u662f\u660e\u667a\u7684\u9078\u64c7\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u89e3\u6c7a SQL \u67e5\u8a62\u8d85\u904e\u5bb9\u91cf\u7684\u6578\u64da\u5eab\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u78ba\u4fdd\u7cfb\u7d71\u7a69\u5b9a\u904b\u884c\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-143747","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143747","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=143747"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143747\/revisions"}],"predecessor-version":[{"id":143748,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143747\/revisions\/143748"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143747"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143747"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}