{"id":187722,"date":"2024-11-11T16:38:18","date_gmt":"2024-11-11T08:38:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187722\/"},"modified":"2024-11-11T16:38:19","modified_gmt":"2024-11-11T08:38:19","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e8%a1%a8%e9%81%94%e5%bc%8f%e8%a8%88%e7%ae%97%e6%8a%80%e5%b7%a7-%e6%95%b8%e6%93%9a%e5%ba%ab-%e8%a1%a8%e9%81%94%e5%bc%8f%e8%a8%88%e7%ae%97","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187722\/","title":{"rendered":"\u6578\u64da\u5eab\u4e2d\u7684\u8868\u9054\u5f0f\u8a08\u7b97\u6280\u5de7 (\u6578\u64da\u5eab-\u8868\u9054\u5f0f\u8a08\u7b97)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e8%a1%a8%e9%81%94%e5%bc%8f%e8%a8%88%e7%ae%97%e6%8a%80%e5%b7%a7-%e6%95%b8%e6%93%9a%e5%ba%ab-%e8%a1%a8%e9%81%94%e5%bc%8f%e8%a8%88%e7%ae%97-EvkvJQhxsb\">\u6578\u64da\u5eab\u4e2d\u7684\u8868\u9054\u5f0f\u8a08\u7b97\u6280\u5de7 (\u6578\u64da\u5eab-\u8868\u9054\u5f0f\u8a08\u7b97)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u8868\u9054\u5f0f\u8a08\u7b97\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728\u67e5\u8a62\u548c\u6578\u64da\u8655\u7406\u904e\u7a0b\u4e2d\u9032\u884c\u66f4\u70ba\u9748\u6d3b\u548c\u9ad8\u6548\u7684\u6578\u64da\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u6578\u64da\u5eab\u4e2d\u7684\u8868\u9054\u5f0f\u8a08\u7b97\u6280\u5de7\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\uff0c\u4ee5\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u9019\u4e00\u4e3b\u984c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%a1%a8%e9%81%94%e5%bc%8f%e8%a8%88%e7%ae%97%ef%bc%9f-EvkvJQhxsb\">\u4ec0\u9ebc\u662f\u8868\u9054\u5f0f\u8a08\u7b97\uff1f<\/h2>\n<p>\u8868\u9054\u5f0f\u8a08\u7b97\u662f\u6307\u5728\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u4f7f\u7528\u904b\u7b97\u7b26\u548c\u51fd\u6578\u4f86\u8a08\u7b97\u548c\u8655\u7406\u6578\u64da\u7684\u904e\u7a0b\u3002\u9019\u4e9b\u8868\u9054\u5f0f\u53ef\u4ee5\u662f\u7c21\u55ae\u7684\u6578\u5b78\u904b\u7b97\uff0c\u4e5f\u53ef\u4ee5\u662f\u8907\u96dc\u7684\u908f\u8f2f\u904b\u7b97\u3002\u901a\u904e\u4f7f\u7528\u8868\u9054\u5f0f\uff0c\u6578\u64da\u5eab\u7528\u6236\u53ef\u4ee5\u5728\u67e5\u8a62\u4e2d\u76f4\u63a5\u9032\u884c\u8a08\u7b97\uff0c\u800c\u7121\u9700\u5728\u61c9\u7528\u5c64\u9032\u884c\u984d\u5916\u7684\u6578\u64da\u8655\u7406\u3002<\/p>\n<h2 id=\"%e8%a1%a8%e9%81%94%e5%bc%8f%e8%a8%88%e7%ae%97%e7%9a%84%e5%9f%ba%e6%9c%ac%e9%81%8b%e7%ae%97%e7%ac%a6-EvkvJQhxsb\">\u8868\u9054\u5f0f\u8a08\u7b97\u7684\u57fa\u672c\u904b\u7b97\u7b26<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u5e38\u898b\u7684\u904b\u7b97\u7b26\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u7b97\u8853\u904b\u7b97\u7b26\uff1a<\/strong>\u5982\u52a0\u6cd5 (+)\u3001\u6e1b\u6cd5 (-)\u3001\u4e58\u6cd5 (*) \u548c\u9664\u6cd5 (\/)\u3002<\/li>\n<li><strong>\u6bd4\u8f03\u904b\u7b97\u7b26\uff1a<\/strong>\u5982\u7b49\u65bc (=)\u3001\u4e0d\u7b49\u65bc ()\u3001\u5927\u65bc (&gt;) \u548c\u5c0f\u65bc (&lt;)\u3002<\/li>\n<li><strong>\u908f\u8f2f\u904b\u7b97\u7b26\uff1a<\/strong>\u5982 AND\u3001OR \u548c NOT\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e8%a1%a8%e9%81%94%e5%bc%8f%e8%a8%88%e7%ae%97%e7%9a%84%e7%a4%ba%e4%be%8b-EvkvJQhxsb\">\u4f7f\u7528\u8868\u9054\u5f0f\u8a08\u7b97\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528 SQL \u8a9e\u8a00\u9032\u884c\u8868\u9054\u5f0f\u8a08\u7b97\u7684\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"1-%e5%9f%ba%e6%9c%ac%e7%9a%84%e7%ae%97%e8%a1%93%e9%81%8b%e7%ae%97-EvkvJQhxsb\">1. \u57fa\u672c\u7684\u7b97\u8853\u904b\u7b97<\/h3>\n<pre><code>SELECT \n    product_name, \n    price, \n    quantity, \n    price * quantity AS total_price \nFROM \n    products;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u8a08\u7b97\u4e86\u6bcf\u500b\u7522\u54c1\u7684\u7e3d\u50f9\u683c\uff0c\u901a\u904e\u5c07\u50f9\u683c\u548c\u6578\u91cf\u76f8\u4e58\u4f86\u7372\u5f97\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e5%87%bd%e6%95%b8%e9%80%b2%e8%a1%8c%e8%a8%88%e7%ae%97-EvkvJQhxsb\">2. \u4f7f\u7528\u51fd\u6578\u9032\u884c\u8a08\u7b97<\/h3>\n<pre><code>SELECT \n    employee_name, \n    salary, \n    ROUND(salary * 0.1, 2) AS bonus \nFROM \n    employees;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u4f7f\u7528\u4e86 ROUND \u51fd\u6578\u4f86\u8a08\u7b97\u54e1\u5de5\u7684\u734e\u91d1\uff0c\u4e26\u5c07\u5176\u56db\u6368\u4e94\u5165\u5230\u5c0f\u6578\u9ede\u5f8c\u5169\u4f4d\u3002<\/p>\n<h3 id=\"3-%e6%a2%9d%e4%bb%b6%e8%a8%88%e7%ae%97-EvkvJQhxsb\">3. \u689d\u4ef6\u8a08\u7b97<\/h3>\n<pre><code>SELECT \n    order_id, \n    CASE \n        WHEN status = 'shipped' THEN '\u5df2\u767c\u8ca8' \n        ELSE '\u5f85\u767c\u8ca8' \n    END AS order_status \nFROM \n    orders;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 CASE \u8a9e\u53e5\u4f86\u6839\u64da\u8a02\u55ae\u72c0\u614b\u8a08\u7b97\u8a02\u55ae\u7684\u986f\u793a\u72c0\u614b\u3002<\/p>\n<h2 id=\"%e8%a1%a8%e9%81%94%e5%bc%8f%e8%a8%88%e7%ae%97%e7%9a%84%e5%84%aa%e5%8b%a2-EvkvJQhxsb\">\u8868\u9054\u5f0f\u8a08\u7b97\u7684\u512a\u52e2<\/h2>\n<p>\u8868\u9054\u5f0f\u8a08\u7b97\u5728\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u5177\u6709\u591a\u7a2e\u512a\u52e2\uff1a<\/p>\n<ul>\n<li><strong>\u63d0\u9ad8\u6548\u7387\uff1a<\/strong>\u901a\u904e\u5728\u6578\u64da\u5eab\u5c64\u9032\u884c\u8a08\u7b97\uff0c\u53ef\u4ee5\u6e1b\u5c11\u61c9\u7528\u5c64\u7684\u8ca0\u64d4\uff0c\u63d0\u9ad8\u6574\u9ad4\u6027\u80fd\u3002<\/li>\n<li><strong>\u7c21\u5316\u67e5\u8a62\uff1a<\/strong>\u7528\u6236\u53ef\u4ee5\u5728\u55ae\u4e00\u67e5\u8a62\u4e2d\u7372\u5f97\u6240\u9700\u7684\u8a08\u7b97\u7d50\u679c\uff0c\u7121\u9700\u591a\u6b21\u67e5\u8a62\u3002<\/li>\n<li><strong>\u9748\u6d3b\u6027\uff1a<\/strong>\u7528\u6236\u53ef\u4ee5\u6839\u64da\u9700\u8981\u81ea\u5b9a\u7fa9\u8a08\u7b97\u908f\u8f2f\uff0c\u6eff\u8db3\u4e0d\u540c\u7684\u696d\u52d9\u9700\u6c42\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-EvkvJQhxsb\">\u7d50\u8ad6<\/h2>\n<p>\u8868\u9054\u5f0f\u8a08\u7b97\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u66f4\u9ad8\u6548\u5730\u8655\u7406\u548c\u5206\u6790\u6578\u64da\u3002\u901a\u904e\u638c\u63e1\u57fa\u672c\u7684\u904b\u7b97\u7b26\u548c\u51fd\u6578\uff0c\u4e26\u9748\u6d3b\u904b\u7528\u5404\u7a2e\u8a08\u7b97\u6280\u5de7\uff0c\u7528\u6236\u53ef\u4ee5\u5728\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u7372\u5f97\u66f4\u5927\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u8868\u9054\u5f0f\u8a08\u7b97\u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u6216\u8005\u5e0c\u671b\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u548c <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u6e90\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u6578\u64da\u5eab\u4e2d\u7684\u8868\u9054\u5f0f\u8a08\u7b97\u6280\u5de7\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u8207\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u638c\u63e1\u95dc\u9375\u6280\u8853\u4ee5\u512a\u5316\u6578\u64da\u7ba1\u7406\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-187722","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187722","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=187722"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187722\/revisions"}],"predecessor-version":[{"id":187723,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187722\/revisions\/187723"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=187722"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=187722"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=187722"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}