{"id":143771,"date":"2024-11-01T01:06:21","date_gmt":"2024-10-31T17:06:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143771\/"},"modified":"2024-11-01T01:06:21","modified_gmt":"2024-10-31T17:06:21","slug":"sql-%e5%b8%b8%e7%94%a8%e8%85%b3%e6%9c%ac%e6%95%b4%e7%90%86%ef%bc%8c%e4%bd%a0%e4%bf%9d%e5%ad%98%e4%ba%86%e5%97%8e%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143771\/","title":{"rendered":"SQL \u5e38\u7528\u8173\u672c\u6574\u7406\uff0c\u4f60\u4fdd\u5b58\u4e86\u55ce\uff1f"},"content":{"rendered":"<h1 id=\"sql-%e5%b8%b8%e7%94%a8%e8%85%b3%e6%9c%ac%e6%95%b4%e7%90%86%ef%bc%8c%e4%bd%a0%e4%bf%9d%e5%ad%98%e4%ba%86%e5%97%8e%ef%bc%9f-jGNzNyaSQA\">SQL \u5e38\u7528\u8173\u672c\u6574\u7406\uff0c\u4f60\u4fdd\u5b58\u4e86\u55ce\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u6700\u5e38\u7528\u7684\u8a9e\u8a00\u4e4b\u4e00\u3002\u7121\u8ad6\u662f\u6578\u64da\u7684\u67e5\u8a62\u3001\u66f4\u65b0\u9084\u662f\u7ba1\u7406\uff0cSQL \u90fd\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\u3002\u5c0d\u65bc\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4f86\u8aaa\uff0c\u64c1\u6709\u4e00\u5957\u5e38\u7528\u7684 SQL \u8173\u672c\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002\u672c\u6587\u5c07\u6574\u7406\u4e00\u4e9b\u5e38\u7528\u7684 SQL \u8173\u672c\uff0c\u5e6b\u52a9\u4f60\u66f4\u597d\u5730\u7ba1\u7406\u6578\u64da\u5eab\u3002<\/p>\n<h2 id=\"1-%e5%9f%ba%e6%9c%ac%e6%9f%a5%e8%a9%a2-jGNzNyaSQA\">1. \u57fa\u672c\u67e5\u8a62<\/h2>\n<p>\u67e5\u8a62\u6578\u64da\u662f SQL \u7684\u57fa\u672c\u529f\u80fd\u4e4b\u4e00\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u67e5\u8a62\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE status = 'active';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u5f9e <code>users<\/code> \u8868\u4e2d\u9078\u64c7\u6240\u6709\u72c0\u614b\u70ba\u300cactive\u300d\u7684\u7528\u6236\u3002<\/p>\n<h2 id=\"2-%e6%8f%92%e5%85%a5%e6%95%b8%e6%93%9a-jGNzNyaSQA\">2. \u63d2\u5165\u6578\u64da<\/h2>\n<p>\u63d2\u5165\u6578\u64da\u7684\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\uff0c\u4ee5\u4e0b\u662f\u4e00\u500b\u63d2\u5165\u65b0\u7528\u6236\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>INSERT INTO users (username, email, status) VALUES ('newuser', 'newuser@example.com', 'active');<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u5728 <code>users<\/code> \u8868\u4e2d\u63d2\u5165\u4e00\u500b\u65b0\u7684\u7528\u6236\u3002<\/p>\n<h2 id=\"3-%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a-jGNzNyaSQA\">3. \u66f4\u65b0\u6578\u64da<\/h2>\n<p>\u66f4\u65b0\u6578\u64da\u6642\uff0c\u9700\u8981\u5c0f\u5fc3\u4ee5\u514d\u4e0d\u5c0f\u5fc3\u66f4\u6539\u4e86\u4e0d\u8a72\u66f4\u6539\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u66f4\u65b0\u7528\u6236\u72c0\u614b\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>UPDATE users SET status = 'inactive' WHERE username = 'olduser';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u628a\u7528\u6236\u540d\u70ba\u300colduser\u300d\u7684\u7528\u6236\u72c0\u614b\u66f4\u65b0\u70ba\u300cinactive\u300d\u3002<\/p>\n<h2 id=\"4-%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a-jGNzNyaSQA\">4. \u522a\u9664\u6578\u64da<\/h2>\n<p>\u522a\u9664\u6578\u64da\u7684\u64cd\u4f5c\u9700\u8981\u8b39\u614e\uff0c\u4ee5\u4e0b\u662f\u4e00\u500b\u522a\u9664\u7528\u6236\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DELETE FROM users WHERE username = 'unwanteduser';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u522a\u9664\u7528\u6236\u540d\u70ba\u300cunwanteduser\u300d\u7684\u7528\u6236\u3002<\/p>\n<h2 id=\"5-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%82%99%e4%bb%bd-jGNzNyaSQA\">5. \u6578\u64da\u5eab\u5099\u4efd<\/h2>\n<p>\u5b9a\u671f\u5099\u4efd\u6578\u64da\u5eab\u662f\u78ba\u4fdd\u6578\u64da\u5b89\u5168\u7684\u91cd\u8981\u63aa\u65bd\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 mysqldump \u9032\u884c\u5099\u4efd\u7684\u547d\u4ee4\uff1a<\/p>\n<pre><code>mysqldump -u username -p database_name &gt; backup.sql<\/code><\/pre>\n<p>\u9019\u689d\u547d\u4ee4\u5c07\u6578\u64da\u5eab <code>database_name<\/code> \u7684\u5167\u5bb9\u5099\u4efd\u5230 <code>backup.sql<\/code> \u6587\u4ef6\u4e2d\u3002<\/p>\n<h2 id=\"6-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%81%a2%e5%be%a9-jGNzNyaSQA\">6. \u6578\u64da\u5eab\u6062\u5fa9<\/h2>\n<p>\u5982\u679c\u9700\u8981\u5f9e\u5099\u4efd\u4e2d\u6062\u5fa9\u6578\u64da\u5eab\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>mysql -u username -p database_name &lt; backup.sql<\/code><\/pre>\n<p>\u9019\u689d\u547d\u4ee4\u5c07\u5f9e <code>backup.sql<\/code> \u6587\u4ef6\u4e2d\u6062\u5fa9\u6578\u64da\u5230\u6307\u5b9a\u7684\u6578\u64da\u5eab\u3002<\/p>\n<h2 id=\"7-%e6%9f%a5%e7%9c%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b5%90%e6%a7%8b-jGNzNyaSQA\">7. \u67e5\u770b\u6578\u64da\u5eab\u7d50\u69cb<\/h2>\n<p>\u4e86\u89e3\u6578\u64da\u5eab\u7684\u7d50\u69cb\u5c0d\u65bc\u7ba1\u7406\u6578\u64da\u5eab\u81f3\u95dc\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u67e5\u770b\u8868\u7d50\u69cb\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DESCRIBE users;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u986f\u793a <code>users<\/code> \u8868\u7684\u7d50\u69cb\uff0c\u5305\u62ec\u5b57\u6bb5\u540d\u7a31\u3001\u6578\u64da\u985e\u578b\u7b49\u4fe1\u606f\u3002<\/p>\n<h2 id=\"8-%e6%9f%a5%e8%a9%a2%e6%80%a7%e8%83%bd%e5%84%aa%e5%8c%96-jGNzNyaSQA\">8. \u67e5\u8a62\u6027\u80fd\u512a\u5316<\/h2>\n<p>\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u67e5\u8a62\u6027\u80fd\u53ef\u80fd\u6703\u6210\u70ba\u74f6\u9838\u3002\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u5275\u5efa\u7d22\u5f15\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE INDEX idx_username ON users (username);<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u5728 <code>users<\/code> \u8868\u7684 <code>username<\/code> \u5b57\u6bb5\u4e0a\u5275\u5efa\u7d22\u5f15\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-jGNzNyaSQA\">\u7e3d\u7d50<\/h2>\n<p>\u4ee5\u4e0a\u6574\u7406\u7684 SQL \u5e38\u7528\u8173\u672c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u66f4\u9ad8\u6548\u5730\u9032\u884c\u6578\u64da\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u67e5\u8a62\u3001\u63d2\u5165\u3001\u66f4\u65b0\u9084\u662f\u5099\u4efd\uff0c\u9019\u4e9b\u8173\u672c\u90fd\u662f\u65e5\u5e38\u5de5\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u82e5\u4f60\u9700\u8981\u66f4\u7a69\u5b9a\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0c\u63d0\u4f9b\u9748\u6d3b\u7684\u8cc7\u6e90\u914d\u7f6e\u548c\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u52a9\u4f60\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6574\u7406\u5e38\u7528SQL\u8173\u672c\uff0c\u63d0\u5347\u5de5\u4f5c\u6548\u7387\uff0c\u8b93\u4f60\u96a8\u6642\u8f15\u9b06\u67e5\u8a62\u8207\u7ba1\u7406\u8cc7\u6599\u5eab\uff0c\u5feb\u4f86\u770b\u770b\u4f60\u662f\u5426\u5df2\u4fdd\u5b58\uff01<\/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-143771","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143771","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=143771"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143771\/revisions"}],"predecessor-version":[{"id":143772,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143771\/revisions\/143772"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143771"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143771"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}