{"id":143745,"date":"2024-11-01T00:53:29","date_gmt":"2024-10-31T16:53:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143745\/"},"modified":"2024-11-01T00:53:30","modified_gmt":"2024-10-31T16:53:30","slug":"sql-%e6%9f%a5%e8%a9%a2%e8%a1%a8%e5%91%bd%e4%bb%a4%e5%a4%a7%e5%85%a8%ef%bc%9a%e5%a6%82%e4%bd%95%e6%9f%a5%e8%a9%a2%e3%80%81%e6%9f%a5%e7%9c%8b%e3%80%81%e5%89%b5%e5%bb%ba%e5%92%8c%e5%88%aa%e9%99%a4","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143745\/","title":{"rendered":"SQL \u67e5\u8a62\u8868\u547d\u4ee4\u5927\u5168\uff1a\u5982\u4f55\u67e5\u8a62\u3001\u67e5\u770b\u3001\u5275\u5efa\u548c\u522a\u9664\u8868\uff1f\uff08sql \u6578\u64da\u5eab\u67e5\u8a62\u8868\u547d\u4ee4\uff09"},"content":{"rendered":"

SQL \u67e5\u8a62\u8868\u547d\u4ee4\u5927\u5168\uff1a\u5982\u4f55\u67e5\u8a62\u3001\u67e5\u770b\u3001\u5275\u5efa\u548c\u522a\u9664\u8868\uff1f\uff08SQL \u6578\u64da\u5eab\u67e5\u8a62\u8868\u547d\u4ee4\uff09<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u81f3\u95dc\u91cd\u8981\u7684\u5de5\u5177\u3002\u7121\u8ad6\u662f\u67e5\u8a62\u6578\u64da\u3001\u5275\u5efa\u65b0\u8868\uff0c\u9084\u662f\u522a\u9664\u4e0d\u518d\u9700\u8981\u7684\u8868\uff0cSQL \u90fd\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u547d\u4ee4\u4f86\u5e6b\u52a9\u7528\u6236\u9ad8\u6548\u5730\u7ba1\u7406\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQL \u4e2d\u7684\u67e5\u8a62\u8868\u547d\u4ee4\uff0c\u5305\u62ec\u5982\u4f55\u67e5\u8a62\u3001\u67e5\u770b\u3001\u5275\u5efa\u548c\u522a\u9664\u8868\u3002<\/p>\n

1. \u67e5\u8a62\u8868\u7684\u57fa\u672c\u547d\u4ee4<\/h2>\n

\u67e5\u8a62\u8868\u7684\u4e3b\u8981\u547d\u4ee4\u662f SELECT<\/code>\u3002\u9019\u500b\u547d\u4ee4\u5141\u8a31\u7528\u6236\u5f9e\u4e00\u500b\u6216\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u57fa\u672c\u7684\u67e5\u8a62\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba employees<\/code> \u7684\u8868\uff0c\u60f3\u8981\u67e5\u8a62\u6240\u6709\u54e1\u5de5\u7684\u59d3\u540d\u548c\u8077\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n
SELECT name, position\nFROM employees;<\/code><\/pre>\n
2. \u67e5\u770b\u8868\u7d50\u69cb<\/h2>\n
\u8981\u67e5\u770b\u8868\u7684\u7d50\u69cb\uff0c\u53ef\u4ee5\u4f7f\u7528 DESCRIBE<\/code> \u6216 SHOW COLUMNS<\/code> \u547d\u4ee4\u3002\u9019\u4e9b\u547d\u4ee4\u5c07\u986f\u793a\u8868\u4e2d\u6240\u6709\u5217\u7684\u540d\u7a31\u3001\u6578\u64da\u985e\u578b\u53ca\u5176\u4ed6\u5c6c\u6027\u3002<\/p>\n
DESCRIBE table_name;<\/code><\/pre>\n
\u6216<\/p>\n
SHOW COLUMNS FROM table_name;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u67e5\u770b employees<\/code> \u8868\u7684\u7d50\u69cb\uff1a<\/p>\n
DESCRIBE employees;<\/code><\/pre>\n
3. \u5275\u5efa\u65b0\u8868<\/h2>\n
\u5275\u5efa\u65b0\u8868\u7684\u547d\u4ee4\u662f CREATE TABLE<\/code>\u3002\u9019\u500b\u547d\u4ee4\u9700\u8981\u6307\u5b9a\u8868\u7684\u540d\u7a31\u4ee5\u53ca\u6bcf\u4e00\u5217\u7684\u6578\u64da\u985e\u578b\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
CREATE TABLE table_name (\n    column1 datatype,\n    column2 datatype,\n    ...\n);<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5275\u5efa\u4e00\u500b\u540d\u70ba departments<\/code> \u7684\u8868\uff0c\u5305\u542b\u90e8\u9580ID\u548c\u90e8\u9580\u540d\u7a31\uff1a<\/p>\n
CREATE TABLE departments (\n    department_id INT PRIMARY KEY,\n    department_name VARCHAR(100)\n);<\/code><\/pre>\n
4. \u522a\u9664\u8868<\/h2>\n
\u5982\u679c\u9700\u8981\u522a\u9664\u4e00\u500b\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528 DROP TABLE<\/code> \u547d\u4ee4\u3002\u9019\u500b\u547d\u4ee4\u6703\u6c38\u4e45\u522a\u9664\u8868\u53ca\u5176\u6240\u6709\u6578\u64da\uff0c\u4f7f\u7528\u6642\u9700\u8b39\u614e\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
DROP TABLE table_name;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u522a\u9664 departments<\/code> \u8868\uff1a<\/p>\n
DROP TABLE departments;<\/code><\/pre>\n
5. \u66f4\u65b0\u548c\u63d2\u5165\u6578\u64da<\/h2>\n
\u9664\u4e86\u67e5\u8a62\u548c\u7ba1\u7406\u8868\u7d50\u69cb\uff0cSQL \u9084\u63d0\u4f9b\u4e86\u66f4\u65b0\u548c\u63d2\u5165\u6578\u64da\u7684\u547d\u4ee4\u3002\u66f4\u65b0\u6578\u64da\u4f7f\u7528 UPDATE<\/code> \u547d\u4ee4\uff0c\u63d2\u5165\u6578\u64da\u4f7f\u7528 INSERT INTO<\/code> \u547d\u4ee4\u3002<\/p>\n
\u66f4\u65b0\u6578\u64da\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n
UPDATE table_name\nSET column1 = value1, column2 = value2, ...\nWHERE condition;<\/code><\/pre>\n
\u63d2\u5165\u6578\u64da\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n
INSERT INTO table_name (column1, column2, ...)\nVALUES (value1, value2, ...);<\/code><\/pre>\n
6. \u5c0f\u7d50<\/h2>\n
SQL \u63d0\u4f9b\u4e86\u591a\u7a2e\u547d\u4ee4\u4f86\u67e5\u8a62\u3001\u67e5\u770b\u3001\u5275\u5efa\u548c\u522a\u9664\u8868\uff0c\u9019\u4e9b\u547d\u4ee4\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7684\u57fa\u790e\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u547d\u4ee4\u5f8c\uff0c\u7528\u6236\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n
\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u6216 \u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u65b9\u6848\u5c07\u662f\u660e\u667a\u4e4b\u8209\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7684\u642d\u5efa\u9084\u662f\u65e5\u5e38\u7684\u6578\u64da\u64cd\u4f5c\uff0c\u7a69\u5b9a\u7684\u4f3a\u670d\u5668\u74b0\u5883\u90fd\u80fd\u63d0\u4f9b\u826f\u597d\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22SQL\u67e5\u8a62\u8868\u547d\u4ee4\u5927\u5168\uff0c\u5b78\u7fd2\u5982\u4f55\u67e5\u8a62\u3001\u67e5\u770b\u3001\u5275\u5efa\u548c\u522a\u9664\u6578\u64da\u5eab\u8868\uff0c\u63d0\u5347\u60a8\u7684\u6578\u64da\u7ba1\u7406\u6280\u80fd\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-143745","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143745","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=143745"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143745\/revisions"}],"predecessor-version":[{"id":143746,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143745\/revisions\/143746"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143745"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143745"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143745"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}