{"id":2362,"date":"2025-03-04T20:29:10","date_gmt":"2025-03-04T12:29:10","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2362"},"modified":"2025-03-04T20:29:10","modified_gmt":"2025-03-04T12:29:10","slug":"sqlite-%e7%b4%a2%e5%bc%95%ef%bc%88index%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/04\/sqlite-%e7%b4%a2%e5%bc%95%ef%bc%88index%ef%bc%89\/","title":{"rendered":"SQLite\u00a0\u7d22\u5f15\uff08Index\uff09"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5728 SQLite \u4e2d\uff0c<strong>\u7d22\u5f15\uff08Index\uff09<\/strong> \u662f\u4e00\u79cd\u7528\u4e8e\u52a0\u901f\u6570\u636e\u68c0\u7d22\u7684\u6570\u636e\u5e93\u5bf9\u8c61\u3002\u5b83\u901a\u8fc7\u4e3a\u8868\u4e2d\u7684\u4e00\u5217\u6216\u591a\u5217\u521b\u5efa\u4e00\u4e2a\u6392\u5e8f\u7684\u6570\u636e\u7ed3\u6784\uff0c\u4f7f\u5f97\u6570\u636e\u5e93\u67e5\u8be2\u80fd\u591f\u66f4\u5feb\u5730\u627e\u5230\u5339\u914d\u7684\u884c\uff0c\u800c\u4e0d\u9700\u8981\u626b\u63cf\u6574\u4e2a\u8868\u3002\u7d22\u5f15\u5728\u5904\u7406\u5927\u6570\u636e\u91cf\u65f6\u5c24\u5176\u6709\u6548\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u5347\u67e5\u8be2\u6548\u7387\u3002<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u7d22\u5f15\u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d22\u5f15\u662f\u6570\u636e\u5e93\u8868\u4e2d\u7684\u4e00\u4e2a\u7279\u6b8a\u5bf9\u8c61\uff0c\u5b83\u662f\u6839\u636e\u4e00\u4e2a\u6216\u591a\u4e2a\u5217\u7684\u503c\u5efa\u7acb\u7684\u6570\u636e\u7ed3\u6784\uff0c\u7c7b\u4f3c\u4e8e\u4e66\u7c4d\u7684\u76ee\u5f55\u3002\u5f53\u4f60\u8fdb\u884c\u67e5\u8be2\u65f6\uff0c\u7d22\u5f15\u5141\u8bb8\u6570\u636e\u5e93\u5f15\u64ce\u5feb\u901f\u5b9a\u4f4d\u5230\u6570\u636e\u6240\u5728\u7684\u4f4d\u7f6e\uff0c\u800c\u65e0\u9700\u904d\u5386\u6574\u4e2a\u8868\u3002\u8fd9\u5927\u5927\u52a0\u5feb\u4e86\u67e5\u8be2\u901f\u5ea6\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u7ecf\u5e38\u88ab\u67e5\u8be2\u7684\u5217\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u521b\u5efa\u7d22\u5f15<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u521b\u5efa\u7d22\u5f15\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE INDEX index_name\nON table_name (column_name);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>index_name<\/code>\uff1a\u7d22\u5f15\u7684\u540d\u79f0\u3002<\/li>\n\n\n\n<li><code>table_name<\/code>\uff1a\u7d22\u5f15\u5c06\u8981\u5e94\u7528\u7684\u8868\u3002<\/li>\n\n\n\n<li><code>column_name<\/code>\uff1a\u7d22\u5f15\u7684\u5217\uff08\u53ef\u4ee5\u662f\u4e00\u4e2a\u6216\u591a\u4e2a\u5217\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE INDEX idx_name ON employees (last_name);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u7d22\u5f15\u5c06\u4e3a <code>employees<\/code> \u8868\u4e2d\u7684 <code>last_name<\/code> \u5217\u521b\u5efa\u4e00\u4e2a\u7d22\u5f15\uff0c\u4ece\u800c\u52a0\u901f\u57fa\u4e8e <code>last_name<\/code> \u5217\u7684\u67e5\u8be2\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u591a\u5217\u7d22\u5f15<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SQLite \u8fd8\u652f\u6301\u591a\u5217\u7d22\u5f15\uff0c\u5373\u4e3a\u591a\u4e2a\u5217\u521b\u5efa\u7d22\u5f15\u3002\u5b83\u9002\u7528\u4e8e\u9700\u8981\u57fa\u4e8e\u591a\u4e2a\u5217\u8fdb\u884c\u67e5\u8be2\u7684\u573a\u666f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8bed\u6cd5<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE INDEX index_name\nON table_name (column1, column2, ...);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE INDEX idx_name_dept ON employees (last_name, department);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u7d22\u5f15\u5c06\u4e3a <code>employees<\/code> \u8868\u7684 <code>last_name<\/code> \u548c <code>department<\/code> \u5217\u521b\u5efa\u4e00\u4e2a\u590d\u5408\u7d22\u5f15\uff0c\u9002\u7528\u4e8e\u67e5\u8be2\u8fd9\u4e24\u5217\u7684\u7ec4\u5408\u6761\u4ef6\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u7d22\u5f15\u7684\u7c7b\u578b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SQLite \u652f\u6301\u51e0\u79cd\u4e0d\u540c\u7c7b\u578b\u7684\u7d22\u5f15\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u666e\u901a\u7d22\u5f15<\/strong>\uff1a\u6700\u5e38\u89c1\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u4f7f\u7528\u9ed8\u8ba4\u7684 B \u6811\u7ed3\u6784\u3002<\/li>\n\n\n\n<li><strong>\u552f\u4e00\u7d22\u5f15\uff08UNIQUE Index\uff09<\/strong>\uff1a\u4fdd\u8bc1\u7d22\u5f15\u5217\u4e2d\u7684\u6240\u6709\u503c\u552f\u4e00\u3002\u8fd9\u4e2a\u7d22\u5f15\u5bf9\u4e8e\u786e\u4fdd\u6570\u636e\u7684\u552f\u4e00\u6027\u975e\u5e38\u6709\u7528\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b<\/strong>\uff1a\u521b\u5efa\u552f\u4e00\u7d22\u5f15<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE UNIQUE INDEX idx_unique_email ON employees (email);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8be5\u7d22\u5f15\u4fdd\u8bc1 <code>employees<\/code> \u8868\u4e2d\u7684 <code>email<\/code> \u5217\u6bcf\u4e2a\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5168\u6587\u7d22\u5f15\uff08FTS\uff09<\/strong>\uff1a\u7528\u4e8e\u5168\u6587\u641c\u7d22\u3002SQLite \u63d0\u4f9b\u4e86\u4e00\u4e2a\u4e13\u95e8\u7684\u6a21\u5757 <code>FTS5<\/code>\uff0c\u7528\u4e8e\u5728\u6587\u672c\u6570\u636e\u4e0a\u8fdb\u884c\u9ad8\u6548\u7684\u5168\u6587\u68c0\u7d22\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. \u67e5\u770b\u73b0\u6709\u7d22\u5f15<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f60\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8be2\u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u6240\u6709\u7684\u7d22\u5f15\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT name FROM sqlite_master WHERE type='index';<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u5c06\u5217\u51fa\u6570\u636e\u5e93\u4e2d\u6240\u6709\u7684\u7d22\u5f15\u540d\u79f0\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6. \u5220\u9664\u7d22\u5f15<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e0d\u518d\u9700\u8981\u67d0\u4e2a\u7d22\u5f15\uff0c\u53ef\u4ee5\u901a\u8fc7 <code>DROP INDEX<\/code> \u8bed\u53e5\u5220\u9664\u5b83\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>DROP INDEX IF EXISTS index_name;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>DROP INDEX IF EXISTS idx_name;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">7. \u4f7f\u7528\u7d22\u5f15\u7684\u6ce8\u610f\u4e8b\u9879<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u67e5\u8be2\u4f18\u5316<\/strong>\uff1a\u7d22\u5f15\u901a\u5e38\u7528\u4e8e\u52a0\u901f <code>SELECT<\/code> \u67e5\u8be2\uff0c\u5c24\u5176\u662f\u90a3\u4e9b\u6d89\u53ca <code>WHERE<\/code> \u5b50\u53e5\u3001<code>JOIN<\/code> \u64cd\u4f5c\u6216\u6392\u5e8f\u7684\u67e5\u8be2\u3002<\/li>\n\n\n\n<li><strong>\u66f4\u65b0\u548c\u63d2\u5165\u6027\u80fd<\/strong>\uff1a\u867d\u7136\u7d22\u5f15\u52a0\u901f\u4e86\u67e5\u8be2\uff0c\u4f46\u5b83\u4eec\u4f1a\u51cf\u6162\u6570\u636e\u63d2\u5165\u548c\u66f4\u65b0\u64cd\u4f5c\u7684\u901f\u5ea6\uff0c\u56e0\u4e3a\u5728\u63d2\u5165\u6216\u66f4\u65b0\u6570\u636e\u65f6\uff0c\u7d22\u5f15\u9700\u8981\u88ab\u76f8\u5e94\u5730\u66f4\u65b0\u3002<\/li>\n\n\n\n<li><strong>\u7d22\u5f15\u7684\u8fc7\u5ea6\u4f7f\u7528<\/strong>\uff1a\u521b\u5efa\u8fc7\u591a\u7684\u7d22\u5f15\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\uff0c\u5c24\u5176\u662f\u5728\u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u64cd\u4f5c\u9891\u7e41\u7684\u60c5\u51b5\u4e0b\u3002\u5e94\u6839\u636e\u5b9e\u9645\u7684\u67e5\u8be2\u9700\u6c42\u6765\u521b\u5efa\u7d22\u5f15\u3002<\/li>\n\n\n\n<li><strong>\u7d22\u5f15\u9009\u62e9\u6027<\/strong>\uff1a\u7d22\u5f15\u7684\u6548\u7387\u901a\u5e38\u4e0e\u5217\u7684\u9009\u62e9\u6027\u76f8\u5173\u3002\u9009\u62e9\u6027\u8f83\u9ad8\u7684\u5217\uff08\u5373\u5177\u6709\u5927\u91cf\u4e0d\u540c\u503c\u7684\u5217\uff09\u901a\u5e38\u80fd\u66f4\u597d\u5730\u52a0\u901f\u67e5\u8be2\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8. \u7d22\u5f15\u7684\u4f18\u5316\u6280\u5de7<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5355\u5217\u7d22\u5f15 vs. \u591a\u5217\u7d22\u5f15<\/strong>\uff1a\u5982\u679c\u67e5\u8be2\u7ecf\u5e38\u6d89\u53ca\u591a\u4e2a\u5217\uff0c\u521b\u5efa\u591a\u5217\u7d22\u5f15\u901a\u5e38\u6bd4\u521b\u5efa\u591a\u4e2a\u5355\u5217\u7d22\u5f15\u66f4\u6709\u6548\u3002<\/li>\n\n\n\n<li><strong>\u8003\u8651\u5220\u9664\u4e0d\u5fc5\u8981\u7684\u7d22\u5f15<\/strong>\uff1a\u5b9a\u671f\u68c0\u67e5\u6570\u636e\u5e93\u4e2d\u662f\u5426\u5b58\u5728\u4e0d\u518d\u9700\u8981\u7684\u7d22\u5f15\uff0c\u5220\u9664\u5b83\u4eec\u4ee5\u8282\u7701\u7a7a\u95f4\u548c\u63d0\u9ad8\u5199\u64cd\u4f5c\u6027\u80fd\u3002<\/li>\n\n\n\n<li><strong>\u4f7f\u7528 <code>EXPLAIN<\/code> \u8bed\u53e5<\/strong>\uff1a\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>EXPLAIN<\/code> \u6765\u67e5\u770b\u67e5\u8be2\u8ba1\u5212\uff0c\u4ee5\u5224\u65ad\u662f\u5426\u4f7f\u7528\u4e86\u7d22\u5f15\uff0c\u4ee5\u53ca\u7d22\u5f15\u662f\u5426\u6709\u6548\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>EXPLAIN SELECT * FROM employees WHERE last_name = 'Smith';<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u67e5\u8be2\u5c06\u663e\u793a\u67e5\u8be2\u7684\u6267\u884c\u8ba1\u5212\uff0c\u5e2e\u52a9\u4f60\u4e86\u89e3\u67e5\u8be2\u662f\u5426\u4f7f\u7528\u4e86\u7d22\u5f15\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u603b\u7ed3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u7684\u5f3a\u5927\u5de5\u5177\uff0c\u4f46\u5e94\u8c28\u614e\u4f7f\u7528\u3002\u5408\u7406\u5730\u8bbe\u8ba1\u7d22\u5f15\u53ef\u4ee5\u663e\u8457\u63d0\u5347\u6570\u636e\u5e93\u7684\u6027\u80fd\uff0c\u4f46\u8fc7\u591a\u7684\u7d22\u5f15\u4f1a\u5f71\u54cd\u5199\u5165\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u5728\u8bbe\u8ba1\u6570\u636e\u5e93\u65f6\u9700\u8981\u6839\u636e\u67e5\u8be2\u9700\u6c42\u5e73\u8861\u7d22\u5f15\u7684\u4f7f\u7528\u3002\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 SQLite \u4e2d\uff0c\u7d22\u5f15\uff08Index\uff09 \u662f\u4e00\u79cd\u7528\u4e8e\u52a0\u901f\u6570\u636e\u68c0\u7d22\u7684\u6570\u636e\u5e93\u5bf9\u8c61\u3002\u5b83\u901a\u8fc7\u4e3a\u8868\u4e2d\u7684\u4e00\u5217\u6216\u591a\u5217\u521b\u5efa\u4e00\u4e2a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[76],"tags":[],"class_list":["post-2362","post","type-post","status-publish","format-standard","hentry","category-sqlite"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2362","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2362"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2362\/revisions"}],"predecessor-version":[{"id":2363,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2362\/revisions\/2363"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2362"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2362"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2362"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}