{"id":193611,"date":"2024-11-12T23:38:20","date_gmt":"2024-11-12T15:38:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/193611\/"},"modified":"2024-11-12T23:38:21","modified_gmt":"2024-11-12T15:38:21","slug":"%e5%b0%8b%e6%89%be%e6%99%82%e5%85%89%e5%be%80%e4%ba%8b%ef%bc%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e8%bc%95%e9%ac%86%e6%9f%a5%ef%bc%8c2023%e5%b9%b4%e8%a8%98%e9%8c%84%e7%b2%be%e6%ba%96%e5%91%88%e7%8f%be","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/193611\/","title":{"rendered":"\u5c0b\u627e\u6642\u5149\u5f80\u4e8b\uff0c\u6578\u64da\u5eab\u8f15\u9b06\u67e5\uff0c2023\u5e74\u8a18\u9304\u7cbe\u6e96\u5448\u73fe (\u6578\u64da\u5eab\u67e5\u8a62\u6642\u9593\u57282023\u5e74\u7684\u8a18\u9304)"},"content":{"rendered":"<h1 id=\"%e5%b0%8b%e6%89%be%e6%99%82%e5%85%89%e5%be%80%e4%ba%8b%ef%bc%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e8%bc%95%e9%ac%86%e6%9f%a5%ef%bc%8c2023%e5%b9%b4%e8%a8%98%e9%8c%84%e7%b2%be%e6%ba%96%e5%91%88%e7%8f%be-SDGCZpRFrd\">\u5c0b\u627e\u6642\u5149\u5f80\u4e8b\uff0c\u6578\u64da\u5eab\u8f15\u9b06\u67e5\uff0c2023\u5e74\u8a18\u9304\u7cbe\u6e96\u5448\u73fe<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u4f4d\u5316\u7684\u6642\u4ee3\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u8207\u67e5\u8a62\u6210\u70ba\u4e86\u4f01\u696d\u904b\u71df\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u96a8\u8457\u6280\u8853\u7684\u9032\u6b65\uff0c\u6578\u64da\u5eab\u7684\u67e5\u8a62\u6548\u7387\u548c\u6e96\u78ba\u6027\u4e5f\u5728\u4e0d\u65b7\u63d0\u5347\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u57282023\u5e74\u8f15\u9b06\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u7684\u6b77\u53f2\u8a18\u9304\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u6280\u5de7\u548c\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-SDGCZpRFrd\">\u6578\u64da\u5eab\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u6578\u64da\u5eab\u67e5\u8a62\u662f\u6307\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6240\u9700\u6578\u64da\u7684\u904e\u7a0b\u3002\u9019\u4e00\u904e\u7a0b\u901a\u5e38\u4f7f\u7528\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff08SQL\uff09\u4f86\u5be6\u73fe\u3002SQL\u662f\u4e00\u7a2e\u6a19\u6e96\u7684\u6578\u64da\u5eab\u67e5\u8a62\u8a9e\u8a00\uff0c\u80fd\u5920\u6709\u6548\u5730\u5f9e\u95dc\u806f\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u4fe1\u606f\u3002<\/p>\n<h3 id=\"sql%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-SDGCZpRFrd\">SQL\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5<\/h3>\n<p>\u5728\u9032\u884c\u6578\u64da\u5eab\u67e5\u8a62\u6642\uff0c\u4e86\u89e3\u57fa\u672c\u7684SQL\u8a9e\u6cd5\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684SQL\u67e5\u8a62\u8a9e\u6cd5\uff1a<\/p>\n<ul>\n<li><code>SELECT<\/code>\uff1a\u7528\u65bc\u9078\u64c7\u6578\u64da\u3002<\/li>\n<li><code>FROM<\/code>\uff1a\u6307\u5b9a\u8981\u67e5\u8a62\u7684\u6578\u64da\u8868\u3002<\/li>\n<li><code>WHERE<\/code>\uff1a\u7528\u65bc\u904e\u6ffe\u67e5\u8a62\u7d50\u679c\u3002<\/li>\n<li><code>ORDER BY<\/code>\uff1a\u7528\u65bc\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a622023\u5e74\u6240\u6709\u7684\u92b7\u552e\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT * FROM sales WHERE year = 2023;<\/code><\/pre>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e6%ad%b7%e5%8f%b2%e8%a8%98%e9%8c%84%e7%9a%84%e6%8a%80%e5%b7%a7-SDGCZpRFrd\">\u67e5\u8a62\u6b77\u53f2\u8a18\u9304\u7684\u6280\u5de7<\/h2>\n<p>\u5728\u67e5\u8a62\u6b77\u53f2\u8a18\u9304\u6642\uff0c\u9664\u4e86\u57fa\u672c\u7684SQL\u8a9e\u6cd5\u5916\uff0c\u9084\u53ef\u4ee5\u63a1\u7528\u4e00\u4e9b\u6280\u5de7\u4f86\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u548c\u6e96\u78ba\u6027\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-SDGCZpRFrd\">1. \u4f7f\u7528\u7d22\u5f15<\/h3>\n<p>\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u3002\u5c0d\u65bc\u7d93\u5e38\u67e5\u8a62\u7684\u5b57\u6bb5\uff0c\u5efa\u8b70\u5efa\u7acb\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u92b7\u552e\u8a18\u9304\u4e2d\u7684\u65e5\u671f\u5b57\u6bb5\uff0c\u53ef\u4ee5\u9019\u6a23\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_date ON sales(date);<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-SDGCZpRFrd\">2. \u4f7f\u7528\u805a\u5408\u51fd\u6578<\/h3>\n<p>\u805a\u5408\u51fd\u6578\u5982<code>COUNT<\/code>\u3001<code>SUM<\/code>\u3001<code>AVG<\/code>\u7b49\u53ef\u4ee5\u5e6b\u52a9\u5feb\u901f\u7372\u53d6\u7d71\u8a08\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u8a08\u7b972023\u5e74\u7684\u7e3d\u92b7\u552e\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>SELECT SUM(amount) FROM sales WHERE year = 2023;<\/code><\/pre>\n<h3 id=\"3-%e5%88%86%e9%a0%81%e6%9f%a5%e8%a9%a2-SDGCZpRFrd\">3. \u5206\u9801\u67e5\u8a62<\/h3>\n<p>\u7576\u67e5\u8a62\u7d50\u679c\u96c6\u975e\u5e38\u9f90\u5927\u6642\uff0c\u4f7f\u7528\u5206\u9801\u67e5\u8a62\u53ef\u4ee5\u63d0\u9ad8\u7528\u6236\u9ad4\u9a57\u3002\u53ef\u4ee5\u4f7f\u7528<code>LIMIT<\/code>\u548c<code>OFFSET<\/code>\u4f86\u5be6\u73fe\u5206\u9801\uff1a<\/p>\n<pre><code>SELECT * FROM sales WHERE year = 2023 LIMIT 10 OFFSET 0;<\/code><\/pre>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%9c%aa%e4%be%86%e8%b6%a8%e5%8b%a2-SDGCZpRFrd\">\u6578\u64da\u5eab\u67e5\u8a62\u7684\u672a\u4f86\u8da8\u52e2<\/h2>\n<p>\u96a8\u8457\u5927\u6578\u64da\u548c\u4eba\u5de5\u667a\u80fd\u6280\u8853\u7684\u767c\u5c55\uff0c\u6578\u64da\u5eab\u67e5\u8a62\u7684\u65b9\u5f0f\u4e5f\u5728\u4e0d\u65b7\u6f14\u8b8a\u3002\u672a\u4f86\uff0c\u6578\u64da\u5eab\u67e5\u8a62\u5c07\u66f4\u52a0\u667a\u80fd\u5316\uff0c\u80fd\u5920\u81ea\u52d5\u5206\u6790\u7528\u6236\u9700\u6c42\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u6578\u64da\u3002\u6b64\u5916\uff0c\u96f2\u6578\u64da\u5eab\u7684\u8208\u8d77\u4f7f\u5f97\u6578\u64da\u5b58\u5132\u548c\u67e5\u8a62\u8b8a\u5f97\u66f4\u52a0\u9748\u6d3b\u548c\u9ad8\u6548\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-SDGCZpRFrd\">\u7d50\u8ad6<\/h2>\n<p>\u57282023\u5e74\uff0c\u6578\u64da\u5eab\u67e5\u8a62\u7684\u6280\u8853\u548c\u65b9\u6cd5\u4e0d\u65b7\u9032\u6b65\uff0c\u4f7f\u5f97\u67e5\u8a62\u6b77\u53f2\u8a18\u9304\u8b8a\u5f97\u66f4\u52a0\u7c21\u55ae\u548c\u9ad8\u6548\u3002\u901a\u904e\u638c\u63e1\u57fa\u672c\u7684SQL\u8a9e\u6cd5\u3001\u4f7f\u7528\u7d22\u5f15\u3001\u805a\u5408\u51fd\u6578\u4ee5\u53ca\u5206\u9801\u67e5\u8a62\u7b49\u6280\u5de7\uff0c\u4f01\u696d\u80fd\u5920\u66f4\u597d\u5730\u7ba1\u7406\u548c\u5229\u7528\u6578\u64da\u3002\u96a8\u8457\u6280\u8853\u7684\u767c\u5c55\uff0c\u672a\u4f86\u7684\u6578\u64da\u5eab\u67e5\u8a62\u5c07\u6703\u66f4\u52a0\u667a\u80fd\u5316\uff0c\u70ba\u7528\u6236\u63d0\u4f9b\u66f4\u597d\u7684\u9ad4\u9a57\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc\u65bc<code><a href=\"https:\/\/server.hk\">VPS<\/a><\/code>\u548c<code><a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d222023\u5e74\u7cbe\u6e96\u8a18\u9304\uff0c\u8f15\u9b06\u67e5\u8a62\u6642\u5149\u5f80\u4e8b\uff0c\u8b93\u6578\u64da\u5eab\u5e36\u4f60\u56de\u9867\u6b77\u53f2\u77ac\u9593\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-193611","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193611","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=193611"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193611\/revisions"}],"predecessor-version":[{"id":193612,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193611\/revisions\/193612"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=193611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=193611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=193611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}