{"id":179888,"date":"2024-11-09T05:38:18","date_gmt":"2024-11-08T21:38:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179888\/"},"modified":"2024-11-09T05:38:19","modified_gmt":"2024-11-08T21:38:19","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%b0%8b%e6%89%be%e4%b8%a6%e6%b1%82%e5%8f%96%e7%89%b9%e5%ae%9a%e6%95%b8%e6%93%9a%e7%9a%84%e4%bb%a3%e7%a2%bc-%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179888\/","title":{"rendered":"\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5c0b\u627e\u4e26\u6c42\u53d6\u7279\u5b9a\u6578\u64da\u7684\u4ee3\u78bc (\u6578\u64da\u5eab\u6c42\u78bc)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%b0%8b%e6%89%be%e4%b8%a6%e6%b1%82%e5%8f%96%e7%89%b9%e5%ae%9a%e6%95%b8%e6%93%9a%e7%9a%84%e4%bb%a3%e7%a2%bc-%e6%95%b8%e6%93%9a%e5%ba%ab-cvxqPfQFkh\">\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5c0b\u627e\u4e26\u6c42\u53d6\u7279\u5b9a\u6578\u64da\u7684\u4ee3\u78bc (\u6578\u64da\u5eab\u6c42\u78bc)<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u67e5\u8a62\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002\u7121\u8ad6\u662f\u4f01\u696d\u9084\u662f\u500b\u4eba\uff0c\u80fd\u5920\u6709\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u5c0b\u627e\u548c\u63d0\u53d6\u7279\u5b9a\u6578\u64da\u7684\u80fd\u529b\u90fd\u662f\u4e00\u9805\u95dc\u9375\u6280\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5c0b\u627e\u4e26\u6c42\u53d6\u7279\u5b9a\u6578\u64da\u7684\u4ee3\u78bc\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\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-cvxqPfQFkh\">\u6578\u64da\u5eab\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u6578\u64da\u5eab\u67e5\u8a62\u662f\u6307\u901a\u904e\u7279\u5b9a\u7684\u8a9e\u8a00\uff08\u5982SQL\uff09\u4f86\u6aa2\u7d22\u548c\u64cd\u4f5c\u6578\u64da\u7684\u904e\u7a0b\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u6700\u5e38\u7528\u7684\u6578\u64da\u5eab\u67e5\u8a62\u8a9e\u8a00\uff0c\u5b83\u5141\u8a31\u7528\u6236\u57f7\u884c\u5404\u7a2e\u64cd\u4f5c\uff0c\u5305\u62ec\u9078\u64c7\u3001\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u6578\u64da\u3002<\/p>\n<h3 id=\"%e5%9f%ba%e6%9c%ac%e7%9a%84sql%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-cvxqPfQFkh\">\u57fa\u672c\u7684SQL\u67e5\u8a62\u8a9e\u53e5<\/h3>\n<p>\u5728SQL\u4e2d\uff0c\u6700\u57fa\u672c\u7684\u67e5\u8a62\u8a9e\u53e5\u662fSELECT\u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u7528\u65bc\u5f9e\u6578\u64da\u5eab\u4e2d\u9078\u64c7\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM customers WHERE country = 'Hong Kong';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u5f9e\u540d\u70ba\u201ccustomers\u201d\u7684\u8868\u4e2d\u9078\u64c7\u6240\u6709\u4f86\u81ea\u9999\u6e2f\u7684\u5ba2\u6236\u6578\u64da\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e6%a2%9d%e4%bb%b6%e9%81%8e%e6%bf%be%e6%95%b8%e6%93%9a-cvxqPfQFkh\">\u4f7f\u7528\u689d\u4ef6\u904e\u6ffe\u6578\u64da<\/h2>\n<p>\u5728\u67e5\u8a62\u6578\u64da\u6642\uff0c\u7d93\u5e38\u9700\u8981\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u4f86\u904e\u6ffe\u6578\u64da\u3002\u9019\u53ef\u4ee5\u901a\u904eWHERE\u5b50\u53e5\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u689d\u4ef6\u904e\u6ffe\u793a\u4f8b\uff1a<\/p>\n<ul>\n<li>\u67e5\u8a62\u7279\u5b9aID\u7684\u6578\u64da\uff1a<\/li>\n<pre><code>SELECT * FROM orders WHERE order_id = 123;<\/code><\/pre>\n<li>\u67e5\u8a62\u67d0\u500b\u7bc4\u570d\u5167\u7684\u6578\u64da\uff1a<\/li>\n<pre><code>SELECT * FROM products WHERE price BETWEEN 100 AND 500;<\/code><\/pre>\n<li>\u67e5\u8a62\u5305\u542b\u7279\u5b9a\u5b57\u4e32\u7684\u6578\u64da\uff1a<\/li>\n<pre><code>SELECT * FROM employees WHERE name LIKE '%John%';<\/code><\/pre>\n<\/ul>\n<h2 id=\"%e6%8e%92%e5%ba%8f%e5%92%8c%e5%88%86%e7%b5%84%e6%95%b8%e6%93%9a-cvxqPfQFkh\">\u6392\u5e8f\u548c\u5206\u7d44\u6578\u64da<\/h2>\n<p>\u5728\u67e5\u8a62\u6578\u64da\u5f8c\uff0c\u53ef\u80fd\u9700\u8981\u5c0d\u7d50\u679c\u9032\u884c\u6392\u5e8f\u6216\u5206\u7d44\u3002\u9019\u53ef\u4ee5\u901a\u904eORDER BY\u548cGROUP BY\u5b50\u53e5\u4f86\u5be6\u73fe\u3002<\/p>\n<h3 id=\"%e6%8e%92%e5%ba%8f%e6%95%b8%e6%93%9a-cvxqPfQFkh\">\u6392\u5e8f\u6578\u64da<\/h3>\n<p>\u4f7f\u7528ORDER BY\u5b50\u53e5\u53ef\u4ee5\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM products ORDER BY price DESC;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6839\u64da\u50f9\u683c\u4ee5\u964d\u5e8f\u6392\u5217\u6240\u6709\u7522\u54c1\u3002<\/p>\n<h3 id=\"%e5%88%86%e7%b5%84%e6%95%b8%e6%93%9a-cvxqPfQFkh\">\u5206\u7d44\u6578\u64da<\/h3>\n<p>\u4f7f\u7528GROUP BY\u5b50\u53e5\u53ef\u4ee5\u5c07\u6578\u64da\u5206\u7d44\uff0c\u901a\u5e38\u8207\u805a\u5408\u51fd\u6578\u4e00\u8d77\u4f7f\u7528\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT COUNT(*) AS total_orders, customer_id FROM orders GROUP BY customer_id;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6839\u64da\u5ba2\u6236ID\u5206\u7d44\uff0c\u4e26\u8a08\u7b97\u6bcf\u500b\u5ba2\u6236\u7684\u8a02\u55ae\u7e3d\u6578\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8join%e6%93%8d%e4%bd%9c%e5%90%88%e4%bd%b5%e6%95%b8%e6%93%9a-cvxqPfQFkh\">\u4f7f\u7528JOIN\u64cd\u4f5c\u5408\u4f75\u6578\u64da<\/h2>\n<p>\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\uff0c\u6578\u64da\u5206\u6563\u5728\u591a\u500b\u8868\u4e2d\uff0c\u9019\u6642\u9700\u8981\u4f7f\u7528JOIN\u64cd\u4f5c\u4f86\u5408\u4f75\u6578\u64da\u3002\u4ee5\u4e0b\u662fINNER JOIN\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT customers.name, orders.order_date \nFROM customers \nINNER JOIN orders ON customers.id = orders.customer_id;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u6240\u6709\u5ba2\u6236\u53ca\u5176\u8a02\u55ae\u65e5\u671f\u7684\u5217\u8868\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-cvxqPfQFkh\">\u7e3d\u7d50<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\u5c0b\u627e\u4e26\u6c42\u53d6\u7279\u5b9a\u6578\u64da\u7684\u80fd\u529b\u5c0d\u65bc\u6578\u64da\u5206\u6790\u548c\u696d\u52d9\u6c7a\u7b56\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u638c\u63e1\u57fa\u672c\u7684SQL\u67e5\u8a62\u8a9e\u53e5\u3001\u689d\u4ef6\u904e\u6ffe\u3001\u6392\u5e8f\u3001\u5206\u7d44\u4ee5\u53caJOIN\u64cd\u4f5c\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u7121\u8ad6\u60a8\u662f\u958b\u767c\u8005\u9084\u662f\u6578\u64da\u5206\u6790\u5e2b\uff0c\u9019\u4e9b\u6280\u80fd\u90fd\u5c07\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u548c\u5229\u7528\u6578\u64da\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\u6578\u64da\u7ba1\u7406\u9700\u6c42\u3002\u9019\u4e9b\u670d\u52d9\u80fd\u5920\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u8cc7\u6e90\u914d\u7f6e\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u8655\u7406\u6578\u64da\u5eab\u67e5\u8a62\u548c\u7ba1\u7406\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5c0b\u627e\u4e26\u63d0\u53d6\u7279\u5b9a\u6578\u64da\u7684\u4ee3\u78bc\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\u6d41\u7a0b\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-179888","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179888","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=179888"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179888\/revisions"}],"predecessor-version":[{"id":179889,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179888\/revisions\/179889"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179888"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179888"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179888"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}