{"id":168439,"date":"2024-11-06T12:23:30","date_gmt":"2024-11-06T04:23:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168439\/"},"modified":"2024-11-06T12:23:31","modified_gmt":"2024-11-06T04:23:31","slug":"sql-%e8%aa%9e%e5%8f%a5%e6%93%8d%e4%bd%9c%e4%b8%bb%e5%be%9e%e9%97%9c%e4%bf%82%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168439\/","title":{"rendered":"SQL \u8a9e\u53e5\u64cd\u4f5c\u4e3b\u5f9e\u95dc\u4fc2\u8868"},"content":{"rendered":"

SQL \u8a9e\u53e5\u64cd\u4f5c\u4e3b\u5f9e\u95dc\u4fc2\u8868<\/h1>\n

\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u4e3b\u5f9e\u95dc\u4fc2\u8868\u662f\u4e00\u7a2e\u5e38\u898b\u7684\u6578\u64da\u7d50\u69cb\uff0c\u901a\u5e38\u7528\u65bc\u8868\u793a\u4e00\u5c0d\u591a\u7684\u95dc\u4fc2\u3002\u9019\u7a2e\u7d50\u69cb\u5728\u8a31\u591a\u61c9\u7528\u4e2d\u90fd\u975e\u5e38\u91cd\u8981\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u8907\u96dc\u7684\u6578\u64da\u6642\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u4f86\u64cd\u4f5c\u4e3b\u5f9e\u95dc\u4fc2\u8868\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u548c\u6280\u5de7\u3002<\/p>\n

\u4e3b\u5f9e\u95dc\u4fc2\u8868\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u4e3b\u5f9e\u95dc\u4fc2\u8868\u901a\u5e38\u7531\u5169\u500b\u8868\u7d44\u6210\uff1a\u4e3b\u8868\u548c\u5f9e\u8868\u3002\u4e3b\u8868\u5305\u542b\u552f\u4e00\u7684\u8a18\u9304\uff0c\u800c\u5f9e\u8868\u5247\u5305\u542b\u8207\u4e3b\u8868\u8a18\u9304\u76f8\u95dc\u7684\u591a\u500b\u8a18\u9304\u3002\u8209\u4f8b\u4f86\u8aaa\uff0c\u8003\u616e\u4e00\u500b\u300c\u5ba2\u6236\u300d\u548c\u300c\u8a02\u55ae\u300d\u7684\u4f8b\u5b50\uff0c\u5176\u4e2d\u300c\u5ba2\u6236\u300d\u8868\u662f\u4e3b\u8868\uff0c\u800c\u300c\u8a02\u55ae\u300d\u8868\u662f\u5f9e\u8868\u3002\u6bcf\u500b\u5ba2\u6236\u53ef\u4ee5\u6709\u591a\u500b\u8a02\u55ae\uff0c\u4f46\u6bcf\u500b\u8a02\u55ae\u53ea\u80fd\u5c6c\u65bc\u4e00\u500b\u5ba2\u6236\u3002<\/p>\n

\u5efa\u7acb\u4e3b\u5f9e\u95dc\u4fc2\u8868<\/h3>\n

\u9996\u5148\uff0c\u6211\u5011\u9700\u8981\u5275\u5efa\u4e3b\u8868\u548c\u5f9e\u8868\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u300c\u5ba2\u6236\u300d\u548c\u300c\u8a02\u55ae\u300d\u8868\u7684 SQL \u8a9e\u53e5\uff1a<\/p>\n

CREATE TABLE \u5ba2\u6236 (\n    \u5ba2\u6236ID INT PRIMARY KEY,\n    \u59d3\u540d VARCHAR(100),\n    \u96fb\u5b50\u90f5\u4ef6 VARCHAR(100)\n);\n\nCREATE TABLE \u8a02\u55ae (\n    \u8a02\u55aeID INT PRIMARY KEY,\n    \u5ba2\u6236ID INT,\n    \u8a02\u55ae\u65e5\u671f DATE,\n    FOREIGN KEY (\u5ba2\u6236ID) REFERENCES \u5ba2\u6236(\u5ba2\u6236ID)\n);<\/code><\/pre>\n
\u63d2\u5165\u6578\u64da<\/h3>\n
\u5728\u5275\u5efa\u4e86\u4e3b\u5f9e\u95dc\u4fc2\u8868\u4e4b\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u63d2\u5165\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u63d2\u5165\u5ba2\u6236\u548c\u8a02\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n
INSERT INTO \u5ba2\u6236 (\u5ba2\u6236ID, \u59d3\u540d, \u96fb\u5b50\u90f5\u4ef6) VALUES\n(1, '\u5f35\u4e09', 'zhangsan@example.com'),\n(2, '\u674e\u56db', 'lisi@example.com');\n\nINSERT INTO \u8a02\u55ae (\u8a02\u55aeID, \u5ba2\u6236ID, \u8a02\u55ae\u65e5\u671f) VALUES\n(1, 1, '2023-01-01'),\n(2, 1, '2023-01-02'),\n(3, 2, '2023-01-03');<\/code><\/pre>\n
\u67e5\u8a62\u6578\u64da<\/h3>\n
\u8981\u67e5\u8a62\u4e3b\u5f9e\u95dc\u4fc2\u8868\u4e2d\u7684\u6578\u64da\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 JOIN \u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u67e5\u8a62\u6240\u6709\u5ba2\u6236\u53ca\u5176\u8a02\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n
SELECT \u5ba2\u6236.\u59d3\u540d, \u8a02\u55ae.\u8a02\u55aeID, \u8a02\u55ae.\u8a02\u55ae\u65e5\u671f\nFROM \u5ba2\u6236\nLEFT JOIN \u8a02\u55ae ON \u5ba2\u6236.\u5ba2\u6236ID = \u8a02\u55ae.\u5ba2\u6236ID;<\/code><\/pre>\n
\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5ba2\u6236\u7684\u59d3\u540d\u53ca\u5176\u76f8\u95dc\u7684\u8a02\u55ae\u8cc7\u8a0a\u3002\u5982\u679c\u67d0\u500b\u5ba2\u6236\u6c92\u6709\u8a02\u55ae\uff0c\u5247\u8a02\u55aeID\u548c\u8a02\u55ae\u65e5\u671f\u5c07\u986f\u793a\u70ba NULL\u3002<\/p>\n
\u66f4\u65b0\u6578\u64da<\/h3>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u66f4\u65b0\u4e3b\u5f9e\u95dc\u4fc2\u8868\u4e2d\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u66f4\u65b0\u8a02\u55ae\u65e5\u671f\u7684\u7bc4\u4f8b\uff1a<\/p>\n
UPDATE \u8a02\u55ae\nSET \u8a02\u55ae\u65e5\u671f = '2023-01-05'\nWHERE \u8a02\u55aeID = 1;<\/code><\/pre>\n
\u522a\u9664\u6578\u64da<\/h3>\n
\u5982\u679c\u9700\u8981\u522a\u9664\u67d0\u500b\u5ba2\u6236\u53ca\u5176\u6240\u6709\u76f8\u95dc\u7684\u8a02\u55ae\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n
DELETE FROM \u8a02\u55ae WHERE \u5ba2\u6236ID = 1;\nDELETE FROM \u5ba2\u6236 WHERE \u5ba2\u6236ID = 1;<\/code><\/pre>\n
\u9019\u6a23\u7684\u64cd\u4f5c\u78ba\u4fdd\u4e86\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0c\u56e0\u70ba\u5728\u522a\u9664\u4e3b\u8868\u4e2d\u7684\u8a18\u9304\u4e4b\u524d\uff0c\u5fc5\u9808\u5148\u522a\u9664\u5f9e\u8868\u4e2d\u7684\u76f8\u95dc\u8a18\u9304\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u4e3b\u5f9e\u95dc\u4fc2\u8868\u5728\u8cc7\u6599\u5eab\u8a2d\u8a08\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u901a\u904e\u4f7f\u7528 SQL \u8a9e\u53e5\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u9019\u4e9b\u8868\u3002\u7121\u8ad6\u662f\u5275\u5efa\u3001\u63d2\u5165\u3001\u67e5\u8a62\u3001\u66f4\u65b0\u9084\u662f\u522a\u9664\u6578\u64da\uff0c\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u90fd\u662f\u8cc7\u6599\u5eab\u7ba1\u7406\u7684\u57fa\u790e\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u53ef\u4ee5\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\uff0c\u78ba\u4fdd\u8cc7\u6599\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22 SQL \u8a9e\u53e5\u5982\u4f55\u64cd\u4f5c\u4e3b\u5f9e\u95dc\u4fc2\u8868\uff0c\u4e86\u89e3\u6578\u64da\u7ba1\u7406\u8207\u67e5\u8a62\u7684\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6548\u80fd\u8207\u4e00\u81f4\u6027\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-168439","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168439","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=168439"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168439\/revisions"}],"predecessor-version":[{"id":168440,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168439\/revisions\/168440"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168439"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168439"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168439"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}