{"id":168417,"date":"2024-11-06T12:12:30","date_gmt":"2024-11-06T04:12:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168417\/"},"modified":"2024-11-06T12:12:31","modified_gmt":"2024-11-06T04:12:31","slug":"sql-%e9%a4%8a%e6%88%90%e9%80%99%e4%ba%9b%e5%a5%bd%e7%bf%92%e6%85%a3%e6%98%af%e4%b8%80%e7%ad%86%e8%b2%a1%e5%af%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168417\/","title":{"rendered":"SQL \u990a\u6210\u9019\u4e9b\u597d\u7fd2\u6163\u662f\u4e00\u7b46\u8ca1\u5bcc"},"content":{"rendered":"

SQL \u990a\u6210\u9019\u4e9b\u597d\u7fd2\u6163\u662f\u4e00\u7b46\u8ca1\u5bcc<\/h1>\n

\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u5df2\u6210\u70ba\u6578\u64da\u7ba1\u7406\u548c\u5206\u6790\u7684\u6838\u5fc3\u5de5\u5177\u3002\u7121\u8ad6\u662f\u958b\u767c\u8005\u3001\u6578\u64da\u5206\u6790\u5e2b\u9084\u662f\u6578\u64da\u79d1\u5b78\u5bb6\uff0c\u638c\u63e1 SQL \u7684\u57fa\u672c\u6280\u80fd\u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u7136\u800c\uff0c\u50c5\u50c5\u4e86\u89e3 SQL \u8a9e\u6cd5\u662f\u4e0d\u5920\u7684\uff0c\u990a\u6210\u826f\u597d\u7684 SQL \u7de8\u5beb\u7fd2\u6163\u5c07\u70ba\u4f60\u7684\u8077\u696d\u751f\u6daf\u5e36\u4f86\u9577\u671f\u7684\u6536\u76ca\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u91cd\u8981\u7684 SQL \u7de8\u5beb\u7fd2\u6163\uff0c\u5e6b\u52a9\u4f60\u5728\u6578\u64da\u8655\u7406\u4e0a\u66f4\u52a0\u9ad8\u6548\u548c\u6e96\u78ba\u3002<\/p>\n

1. \u4f7f\u7528\u6e05\u6670\u7684\u547d\u540d\u898f\u5247<\/h2>\n

\u5728\u7de8\u5beb SQL \u67e5\u8a62\u6642\uff0c\u4f7f\u7528\u6e05\u6670\u4e14\u4e00\u81f4\u7684\u547d\u540d\u898f\u5247\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u63d0\u9ad8\u53ef\u8b80\u6027\uff0c\u9084\u80fd\u4f7f\u5176\u4ed6\u958b\u767c\u8005\u66f4\u5bb9\u6613\u7406\u89e3\u4f60\u7684\u4ee3\u78bc\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u8868\u683c\u548c\u5217\u7684\u547d\u540d\uff0c\u61c9\u8a72\u4f7f\u7528\u63cf\u8ff0\u6027\u7684\u540d\u7a31\uff0c\u800c\u4e0d\u662f\u7c21\u55ae\u7684\u7e2e\u5beb\u6216\u7121\u610f\u7fa9\u7684\u5b57\u6bcd\u7d44\u5408\u3002<\/p>\n

-- \u4e0d\u63a8\u85a6\u7684\u547d\u540d\nSELECT * FROM t1;\n\n-- \u63a8\u85a6\u7684\u547d\u540d\nSELECT * FROM customers;\n<\/code><\/pre>\n
2. \u9069\u7576\u4f7f\u7528\u8a3b\u89e3<\/h2>\n
\u5728\u8907\u96dc\u7684 SQL \u67e5\u8a62\u4e2d\uff0c\u9069\u7576\u7684\u8a3b\u89e3\u53ef\u4ee5\u5e6b\u52a9\u4f60\u548c\u5176\u4ed6\u958b\u767c\u8005\u7406\u89e3\u4ee3\u78bc\u7684\u908f\u8f2f\u3002\u8a3b\u89e3\u61c9\u8a72\u7c21\u6f54\u660e\u4e86\uff0c\u4e26\u89e3\u91cb\u67e5\u8a62\u7684\u76ee\u7684\u6216\u7279\u5b9a\u908f\u8f2f\u7684\u539f\u56e0\u3002<\/p>\n
-- \u7372\u53d6\u6240\u6709\u6d3b\u8e8d\u5ba2\u6236\u7684\u8a02\u55ae\nSELECT * FROM orders WHERE status = 'active';\n<\/code><\/pre>\n
3. \u512a\u5316\u67e5\u8a62\u6027\u80fd<\/h2>\n
\u6027\u80fd\u512a\u5316\u662f SQL \u7de8\u5beb\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u65b9\u9762\u3002\u4f7f\u7528\u7d22\u5f15\u3001\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5168\u8868\u6383\u63cf\u4ee5\u53ca\u9078\u64c7\u5408\u9069\u7684 JOIN \u985e\u578b\u90fd\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u6709\u6548\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u7576\u4f60\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u7372\u53d6\u6578\u64da\u6642\uff0c\u4f7f\u7528 INNER JOIN \u800c\u4e0d\u662f LEFT JOIN \u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n
-- \u4f7f\u7528 INNER JOIN \u7372\u53d6\u5ba2\u6236\u548c\u8a02\u55ae\u4fe1\u606f\nSELECT customers.name, orders.amount\nFROM customers\nINNER JOIN orders ON customers.id = orders.customer_id;\n<\/code><\/pre>\n
4. \u6e2c\u8a66\u548c\u9a57\u8b49\u67e5\u8a62\u7d50\u679c<\/h2>\n
\u5728\u57f7\u884c SQL \u67e5\u8a62\u4e4b\u524d\uff0c\u9032\u884c\u6e2c\u8a66\u548c\u9a57\u8b49\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u9019\u53ef\u4ee5\u5e6b\u52a9\u4f60\u78ba\u4fdd\u67e5\u8a62\u7684\u6b63\u78ba\u6027\u548c\u6709\u6548\u6027\u3002\u4f7f\u7528 LIMIT \u5b50\u53e5\u4f86\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\uff0c\u9019\u6a23\u53ef\u4ee5\u5feb\u901f\u6aa2\u67e5\u67e5\u8a62\u7684\u7d50\u679c\uff0c\u800c\u4e0d\u5fc5\u7b49\u5f85\u6574\u500b\u67e5\u8a62\u7684\u57f7\u884c\u3002<\/p>\n
-- \u6e2c\u8a66\u67e5\u8a62\u7d50\u679c\nSELECT * FROM orders LIMIT 10;\n<\/code><\/pre>\n
5. \u5b9a\u671f\u91cd\u69cb\u4ee3\u78bc<\/h2>\n
\u96a8\u8457\u6642\u9593\u7684\u63a8\u79fb\uff0cSQL \u67e5\u8a62\u53ef\u80fd\u6703\u8b8a\u5f97\u5197\u9577\u6216\u8907\u96dc\u3002\u5b9a\u671f\u91cd\u69cb\u4ee3\u78bc\u53ef\u4ee5\u5e6b\u52a9\u4f60\u4fdd\u6301\u4ee3\u78bc\u7684\u6574\u6f54\u548c\u53ef\u7dad\u8b77\u6027\u3002\u9019\u5305\u62ec\u522a\u9664\u4e0d\u5fc5\u8981\u7684\u4ee3\u78bc\u3001\u5408\u4f75\u91cd\u8907\u7684\u67e5\u8a62\u4ee5\u53ca\u4f7f\u7528\u8996\u5716\u4f86\u7c21\u5316\u8907\u96dc\u7684\u67e5\u8a62\u3002<\/p>\n
-- \u4f7f\u7528\u8996\u5716\u7c21\u5316\u67e5\u8a62\nCREATE VIEW active_orders AS\nSELECT * FROM orders WHERE status = 'active';\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u990a\u6210\u826f\u597d\u7684 SQL \u7de8\u5beb\u7fd2\u6163\u4e0d\u50c5\u80fd\u63d0\u9ad8\u4f60\u7684\u5de5\u4f5c\u6548\u7387\uff0c\u9084\u80fd\u70ba\u4f60\u7684\u8077\u696d\u751f\u6daf\u589e\u6dfb\u50f9\u503c\u3002\u901a\u904e\u4f7f\u7528\u6e05\u6670\u7684\u547d\u540d\u898f\u5247\u3001\u9069\u7576\u7684\u8a3b\u89e3\u3001\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3001\u6e2c\u8a66\u67e5\u8a62\u7d50\u679c\u4ee5\u53ca\u5b9a\u671f\u91cd\u69cb\u4ee3\u78bc\uff0c\u4f60\u5c07\u80fd\u5920\u5728\u6578\u64da\u7ba1\u7406\u4e2d\u6e38\u5203\u6709\u9918\u3002\u82e5\u4f60\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528 \u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0c\u9019\u5c07\u70ba\u4f60\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5b78\u7fd2SQL\u7684\u597d\u7fd2\u6163\u80fd\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u70ba\u8077\u696d\u751f\u6daf\u589e\u6dfb\u50f9\u503c\uff0c\u8b93\u4f60\u5728\u6578\u64da\u4e16\u754c\u4e2d\u7372\u5f97\u6210\u529f\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-168417","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168417","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=168417"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168417\/revisions"}],"predecessor-version":[{"id":168418,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168417\/revisions\/168418"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168417"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}