{"id":165875,"date":"2024-11-05T13:34:20","date_gmt":"2024-11-05T05:34:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/165875\/"},"modified":"2024-11-05T13:34:21","modified_gmt":"2024-11-05T05:34:21","slug":"%e5%bf%ab%e9%80%9f%e6%9f%a5%e6%89%be%e5%a4%9a%e9%87%8d%e6%a2%9d%e4%bb%b6%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e6%8a%80%e5%b7%a7-%e6%9f%a5%e6%89%be%e6%bb%bf%e8%b6%b3%e5%a4%9a%e5%80%8b%e6%a2%9d%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/165875\/","title":{"rendered":"\u5feb\u901f\u67e5\u627e\u591a\u91cd\u689d\u4ef6\u7684\u6578\u64da\u5eab\u6280\u5de7 (\u67e5\u627e\u6eff\u8db3\u591a\u500b\u689d\u4ef6\u7684\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e5%bf%ab%e9%80%9f%e6%9f%a5%e6%89%be%e5%a4%9a%e9%87%8d%e6%a2%9d%e4%bb%b6%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e6%8a%80%e5%b7%a7-%e6%9f%a5%e6%89%be%e6%bb%bf%e8%b6%b3%e5%a4%9a%e5%80%8b%e6%a2%9d%e4%bb%b6-VApRkDvcSb\">\u5feb\u901f\u67e5\u627e\u591a\u91cd\u689d\u4ef6\u7684\u6578\u64da\u5eab\u6280\u5de7 (\u67e5\u627e\u6eff\u8db3\u591a\u500b\u689d\u4ef6\u7684\u6578\u64da\u5eab)<\/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\u5c0d\u65bc\u4f01\u696d\u7684\u904b\u71df\u81f3\u95dc\u91cd\u8981\u3002\u5c24\u5176\u662f\u5728\u9700\u8981\u6eff\u8db3\u591a\u500b\u67e5\u8a62\u689d\u4ef6\u7684\u60c5\u6cc1\u4e0b\uff0c\u5982\u4f55\u5feb\u901f\u67e5\u627e\u6578\u64da\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u6709\u6548\u7684\u6280\u5de7\uff0c\u5e6b\u52a9\u7528\u6236\u5728\u6578\u64da\u5eab\u4e2d\u5feb\u901f\u67e5\u627e\u6eff\u8db3\u591a\u91cd\u689d\u4ef6\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"%e7%90%86%e8%a7%a3%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-VApRkDvcSb\">\u7406\u89e3\u6578\u64da\u5eab\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5728\u9032\u884c\u6578\u64da\u5eab\u67e5\u8a62\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u4e86\u89e3\u6578\u64da\u5eab\u7684\u57fa\u672c\u7d50\u69cb\u548c\u67e5\u8a62\u8a9e\u8a00\u3002\u5927\u591a\u6578\u6578\u64da\u5eab\u4f7f\u7528SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u4f86\u9032\u884c\u6578\u64da\u64cd\u4f5c\u3002SQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u67e5\u8a62\u65b9\u5f0f\uff0c\u80fd\u5920\u6839\u64da\u4e0d\u540c\u7684\u689d\u4ef6\u7be9\u9078\u6578\u64da\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8where%e5%ad%90%e5%8f%a5%e9%80%b2%e8%a1%8c%e5%a4%9a%e9%87%8d%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2-VApRkDvcSb\">\u4f7f\u7528WHERE\u5b50\u53e5\u9032\u884c\u591a\u91cd\u689d\u4ef6\u67e5\u8a62<\/h2>\n<p>\u5728SQL\u4e2d\uff0c<code>WHERE<\/code>\u5b50\u53e5\u662f\u7528\u4f86\u6307\u5b9a\u67e5\u8a62\u689d\u4ef6\u7684\u3002\u7576\u9700\u8981\u67e5\u627e\u6eff\u8db3\u591a\u500b\u689d\u4ef6\u7684\u6578\u64da\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u908f\u8f2f\u904b\u7b97\u7b26\u5982<code>AND<\/code>\u548c<code>OR<\/code>\u4f86\u7d44\u5408\u689d\u4ef6\u3002<\/p>\n<pre><code>SELECT * FROM customers \nWHERE country = 'Hong Kong' \nAND age &gt; 30 \nOR membership = 'premium';\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u4f86\u81ea\u9999\u6e2f\u7684\u5ba2\u6236\uff0c\u5e74\u9f61\u5927\u65bc30\u6b72\uff0c\u6216\u8005\u64c1\u6709\u9ad8\u7d1a\u6703\u54e1\u8cc7\u683c\u7684\u5ba2\u6236\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95%e6%8f%90%e9%ab%98%e6%9f%a5%e8%a9%a2%e6%95%88%e7%8e%87-VApRkDvcSb\">\u4f7f\u7528\u7d22\u5f15\u63d0\u9ad8\u67e5\u8a62\u6548\u7387<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u53ef\u4ee5\u52a0\u901f\u67e5\u8a62\u64cd\u4f5c\u3002\u5c0d\u65bc\u7d93\u5e38\u7528\u65bc\u67e5\u8a62\u7684\u5217\uff0c\u5efa\u7acb\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f7f\u7528\u7d22\u5f15\u6642\uff0c\u61c9\u8003\u616e\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u9078\u64c7\u9069\u5408\u7684\u5217\u9032\u884c\u7d22\u5f15\uff0c\u901a\u5e38\u662f\u7d93\u5e38\u7528\u65bc\u67e5\u8a62\u7684\u5217\u3002<\/li>\n<li>\u907f\u514d\u5728\u4f4e\u57fa\u6578\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u56e0\u70ba\u9019\u6a23\u7684\u7d22\u5f15\u53ef\u80fd\u4e0d\u6703\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li>\u5b9a\u671f\u7dad\u8b77\u7d22\u5f15\uff0c\u78ba\u4fdd\u5176\u6027\u80fd\u6700\u4f73\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8join%e6%93%8d%e4%bd%9c%e6%9f%a5%e6%89%be%e7%9b%b8%e9%97%9c%e6%95%b8%e6%93%9a-VApRkDvcSb\">\u4f7f\u7528JOIN\u64cd\u4f5c\u67e5\u627e\u76f8\u95dc\u6578\u64da<\/h2>\n<p>\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\uff0c\u6578\u64da\u5206\u4f48\u5728\u591a\u500b\u8868\u4e2d\u3002\u4f7f\u7528<code>JOIN<\/code>\u64cd\u4f5c\u53ef\u4ee5\u5c07\u9019\u4e9b\u8868\u4e2d\u7684\u6578\u64da\u7d50\u5408\u8d77\u4f86\uff0c\u5f9e\u800c\u6eff\u8db3\u591a\u91cd\u689d\u4ef6\u7684\u67e5\u8a62\u9700\u6c42\u3002<\/p>\n<pre><code>SELECT orders.order_id, customers.customer_name \nFROM orders \nJOIN customers ON orders.customer_id = customers.customer_id \nWHERE customers.country = 'Hong Kong' \nAND orders.order_date &gt; '2023-01-01';\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u4f86\u81ea\u9999\u6e2f\u7684\u5ba2\u6236\u53ca\u5176\u8a02\u55ae\uff0c\u4e26\u4e14\u8a02\u55ae\u65e5\u671f\u57282023\u5e741\u67081\u65e5\u4e4b\u5f8c\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%ad%90%e6%9f%a5%e8%a9%a2%e9%80%b2%e8%a1%8c%e8%a4%87%e9%9b%9c%e6%9f%a5%e8%a9%a2-VApRkDvcSb\">\u4f7f\u7528\u5b50\u67e5\u8a62\u9032\u884c\u8907\u96dc\u67e5\u8a62<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u5b50\u67e5\u8a62\u53ef\u4ee5\u66f4\u9748\u6d3b\u5730\u6eff\u8db3\u591a\u91cd\u689d\u4ef6\u7684\u67e5\u8a62\u9700\u6c42\u3002\u5b50\u67e5\u8a62\u662f\u4e00\u500b\u5d4c\u5957\u5728\u5176\u4ed6\u67e5\u8a62\u4e2d\u7684\u67e5\u8a62\uff0c\u53ef\u4ee5\u7528\u4f86\u9032\u884c\u66f4\u8907\u96dc\u7684\u6578\u64da\u7be9\u9078\u3002<\/p>\n<pre><code>SELECT * FROM products \nWHERE category_id IN (SELECT category_id FROM categories WHERE category_name = 'Electronics');\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5c6c\u65bc\u201c\u96fb\u5b50\u7522\u54c1\u201d\u985e\u5225\u7684\u7522\u54c1\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-VApRkDvcSb\">\u7e3d\u7d50<\/h2>\n<p>\u5feb\u901f\u67e5\u627e\u6eff\u8db3\u591a\u91cd\u689d\u4ef6\u7684\u6578\u64da\u5eab\u6578\u64da\u9700\u8981\u638c\u63e1\u4e00\u4e9b\u57fa\u672c\u7684SQL\u67e5\u8a62\u6280\u5de7\uff0c\u5305\u62ec\u4f7f\u7528<code>WHERE<\/code>\u5b50\u53e5\u3001\u7d22\u5f15\u3001<code>JOIN<\/code>\u64cd\u4f5c\u548c\u5b50\u67e5\u8a62\u7b49\u3002\u9019\u4e9b\u6280\u5de7\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u9084\u80fd\u5e6b\u52a9\u7528\u6236\u66f4\u9748\u6d3b\u5730\u8655\u7406\u8907\u96dc\u7684\u6578\u64da\u9700\u6c42\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5b58\u5132\u9084\u662f\u6578\u64da\u8655\u7406\uff0c\u9078\u64c7\u5408\u9069\u7684\u670d\u52d9\u5668\u90fd\u80fd\u986f\u8457\u63d0\u5347\u60a8\u7684\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1\u5feb\u901f\u67e5\u627e\u591a\u91cd\u689d\u4ef6\u7684\u6578\u64da\u5eab\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387\uff0c\u8f15\u9b06\u627e\u5230\u6eff\u8db3\u591a\u500b\u689d\u4ef6\u7684\u6578\u64da\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-165875","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/165875","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=165875"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/165875\/revisions"}],"predecessor-version":[{"id":165876,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/165875\/revisions\/165876"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=165875"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=165875"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=165875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}