{"id":143857,"date":"2024-11-01T01:50:23","date_gmt":"2024-10-31T17:50:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143857\/"},"modified":"2024-11-01T01:50:24","modified_gmt":"2024-10-31T17:50:24","slug":"sql-%e5%bf%ab%e6%8d%b7%e9%8d%b5%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143857\/","title":{"rendered":"SQL \u5feb\u6377\u9375\u4ecb\u7d39"},"content":{"rendered":"

SQL \u5feb\u6377\u9375\u4ecb\u7d39<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u548c\u64cd\u4f5c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u7121\u8ad6\u662f\u6578\u64da\u7684\u67e5\u8a62\u3001\u66f4\u65b0\u9084\u662f\u7ba1\u7406\uff0c\u719f\u6089 SQL \u7684\u57fa\u672c\u8a9e\u6cd5\u548c\u64cd\u4f5c\u90fd\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u800c\u5728\u65e5\u5e38\u4f7f\u7528\u4e2d\uff0c\u638c\u63e1\u4e00\u4e9b SQL \u7684\u5feb\u6377\u9375\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u5e38\u7528\u7684 SQL \u5feb\u6377\u9375\u53ca\u5176\u61c9\u7528\u3002<\/p>\n

\u5e38\u7528 SQL \u5feb\u6377\u9375<\/h2>\n

1. \u67e5\u8a62\u6578\u64da<\/h3>\n

\u67e5\u8a62\u6578\u64da\u662f SQL \u4e2d\u6700\u57fa\u672c\u7684\u64cd\u4f5c\u4e4b\u4e00\u3002\u4f7f\u7528 SELECT<\/code> \u8a9e\u53e5\u53ef\u4ee5\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684\u67e5\u8a62\u7bc4\u4f8b\uff1a<\/p>\n

SELECT * FROM users WHERE age > 18;<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u5f9e users<\/code> \u8868\u4e2d\u9078\u64c7\u6240\u6709\u5e74\u9f61\u5927\u65bc 18 \u7684\u7528\u6236\u3002<\/p>\n
2. \u63d2\u5165\u6578\u64da<\/h3>\n
\u8981\u5411\u6578\u64da\u5eab\u4e2d\u63d2\u5165\u65b0\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 INSERT INTO<\/code> \u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u63d2\u5165\u6578\u64da\u7684\u7bc4\u4f8b\uff1a<\/p>\n
INSERT INTO users (name, age) VALUES ('John Doe', 30);<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u5728 users<\/code> \u8868\u4e2d\u63d2\u5165\u4e00\u689d\u65b0\u8a18\u9304\uff0c\u5305\u542b\u59d3\u540d\u548c\u5e74\u9f61\u3002<\/p>\n
3. \u66f4\u65b0\u6578\u64da<\/h3>\n
\u5982\u679c\u9700\u8981\u66f4\u65b0\u5df2\u5b58\u5728\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 UPDATE<\/code> \u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u66f4\u65b0\u6578\u64da\u7684\u7bc4\u4f8b\uff1a<\/p>\n
UPDATE users SET age = 31 WHERE name = 'John Doe';<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u66f4\u65b0 users<\/code> \u8868\u4e2d\u540d\u70ba ‘John Doe’ \u7684\u7528\u6236\u7684\u5e74\u9f61\u3002<\/p>\n
4. \u522a\u9664\u6578\u64da<\/h3>\n
\u8981\u522a\u9664\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 DELETE FROM<\/code> \u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u522a\u9664\u6578\u64da\u7684\u7bc4\u4f8b\uff1a<\/p>\n
DELETE FROM users WHERE age < 18;<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u522a\u9664\u6240\u6709\u5e74\u9f61\u5c0f\u65bc 18 \u7684\u7528\u6236\u8a18\u9304\u3002<\/p>\n
SQL \u5feb\u6377\u9375\u7684\u4f7f\u7528\u6280\u5de7<\/h2>\n
1. \u4f7f\u7528\u81ea\u52d5\u5b8c\u6210\u529f\u80fd<\/h3>\n
\u8a31\u591a SQL \u7de8\u8f2f\u5668\u63d0\u4f9b\u81ea\u52d5\u5b8c\u6210\u529f\u80fd\uff0c\u7576\u4f60\u958b\u59cb\u8f38\u5165 SQL \u8a9e\u53e5\u6642\uff0c\u7de8\u8f2f\u5668\u6703\u81ea\u52d5\u5efa\u8b70\u53ef\u80fd\u7684\u95dc\u9375\u5b57\u548c\u8868\u540d\u3002\u9019\u4e0d\u50c5\u53ef\u4ee5\u7bc0\u7701\u6642\u9593\uff0c\u9084\u80fd\u6e1b\u5c11\u62fc\u5beb\u932f\u8aa4\u3002<\/p>\n
2. \u5feb\u901f\u57f7\u884c\u67e5\u8a62<\/h3>\n
\u5728\u8a31\u591a SQL \u7de8\u8f2f\u5668\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 Ctrl + Enter<\/code> \u5feb\u6377\u9375\u4f86\u5feb\u901f\u57f7\u884c\u7576\u524d\u67e5\u8a62\u3002\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u4f7f\u7528\u6ed1\u9f20\u9ede\u64ca\u57f7\u884c\u6309\u9215\uff0c\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n
3. \u683c\u5f0f\u5316 SQL \u8a9e\u53e5<\/h3>\n
\u70ba\u4e86\u63d0\u9ad8\u53ef\u8b80\u6027\uff0c\u8a31\u591a\u7de8\u8f2f\u5668\u63d0\u4f9b\u683c\u5f0f\u5316\u529f\u80fd\u3002\u4f7f\u7528 Ctrl + Shift + F<\/code> \u53ef\u4ee5\u81ea\u52d5\u683c\u5f0f\u5316 SQL \u8a9e\u53e5\uff0c\u4f7f\u5176\u66f4\u6613\u65bc\u95b1\u8b80\u548c\u7dad\u8b77\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u638c\u63e1 SQL \u7684\u57fa\u672c\u64cd\u4f5c\u548c\u5feb\u6377\u9375\u4e0d\u50c5\u80fd\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\uff0c\u9084\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\u3002\u7121\u8ad6\u662f\u5728\u65e5\u5e38\u7684\u6578\u64da\u67e5\u8a62\u9084\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u719f\u6089\u9019\u4e9b\u5feb\u6377\u9375\u90fd\u5c07\u5927\u6709\u88e8\u76ca\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u66f4\u9ad8\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528 \u9999\u6e2fVPS<\/a> \u670d\u52d9\u4f86\u63d0\u5347\u60a8\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\u3002\u7121\u8ad6\u662f\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u5b58\u5132\u9084\u662f\u9748\u6d3b\u7684\u6578\u64da\u7ba1\u7406\uff0c\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22 SQL \u5feb\u6377\u9375\u7684\u4ecb\u7d39\uff0c\u63d0\u5347\u4f60\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u6548\u7387\uff0c\u5feb\u901f\u638c\u63e1\u5e38\u7528\u6307\u4ee4\uff0c\u8b93\u7de8\u78bc\u66f4\u6d41\u66a2\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-143857","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143857","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=143857"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143857\/revisions"}],"predecessor-version":[{"id":143858,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143857\/revisions\/143858"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143857"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143857"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143857"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}