{"id":2364,"date":"2025-03-04T20:31:30","date_gmt":"2025-03-04T12:31:30","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2364"},"modified":"2025-03-04T20:31:30","modified_gmt":"2025-03-04T12:31:30","slug":"sqlite-indexed-by","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/04\/sqlite-indexed-by\/","title":{"rendered":"SQLite\u00a0Indexed By"},"content":{"rendered":"\n
\n

\u5728 SQLite \u4e2d\uff0cINDEXED BY<\/code> \u662f\u4e00\u4e2a\u5173\u952e\u5b57\uff0c\u7528\u4e8e\u6307\u5b9a\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3002\u901a\u5e38\uff0cSQLite \u4f1a\u81ea\u52a8\u9009\u62e9\u6700\u4f73\u7684\u7d22\u5f15\u6765\u4f18\u5316\u67e5\u8be2\uff0c\u4f46\u662f\u6709\u65f6\u4f60\u53ef\u80fd\u60f3\u8981\u663e\u5f0f\u5730\u6307\u5b9a\u67d0\u4e2a\u7d22\u5f15\u6765\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\uff0c\u6216\u8005\u907f\u514d SQLite \u4f7f\u7528\u9ed8\u8ba4\u7684\u7d22\u5f15\u3002<\/p>\n<\/blockquote>\n\n\n\n

INDEXED BY<\/code> \u53ef\u4ee5\u5728 SELECT<\/code> \u67e5\u8be2\u4e2d\u4f7f\u7528\uff0c\u6307\u5b9a\u67e5\u8be2\u5e94\u8be5\u4f7f\u7528\u54ea\u4e2a\u7d22\u5f15\u6765\u68c0\u7d22\u6570\u636e\u3002<\/p>\n\n\n\n

1. \u4f7f\u7528 INDEXED BY<\/code><\/h3>\n\n\n\n

INDEXED BY<\/code> \u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n

SELECT column_name\nFROM table_name\nINDEXED BY index_name\nWHERE condition;<\/code><\/pre>\n\n\n\n
    \n
  • index_name<\/code>\uff1a\u4f60\u60f3\u4f7f\u7528\u7684\u7d22\u5f15\u7684\u540d\u79f0\u3002<\/li>\n\n\n\n
  • table_name<\/code>\uff1a\u8981\u67e5\u8be2\u7684\u8868\u3002<\/li>\n\n\n\n
  • column_name<\/code>\uff1a\u4f60\u60f3\u8981\u67e5\u8be2\u7684\u5217\u3002<\/li>\n<\/ul>\n\n\n\n
    2. \u793a\u4f8b\uff1a\u4f7f\u7528 INDEXED BY<\/code><\/h3>\n\n\n\n
    \u5047\u8bbe\u6709\u4e00\u4e2a\u8868 employees<\/code>\uff0c\u5e76\u4e14\u4f60\u5df2\u7ecf\u4e3a last_name<\/code> \u5217\u521b\u5efa\u4e86\u4e00\u4e2a\u7d22\u5f15 idx_last_name<\/code>\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 INDEXED BY<\/code> \u6765\u6307\u5b9a\u67e5\u8be2\u4f7f\u7528 idx_last_name<\/code> \u7d22\u5f15\uff1a<\/p>\n\n\n\n
    CREATE INDEX idx_last_name ON employees (last_name);<\/code><\/pre>\n\n\n\n
    \u4f7f\u7528 INDEXED BY<\/code> \u67e5\u8be2\uff1a<\/strong><\/p>\n\n\n\n
    SELECT * FROM employees\nINDEXED BY idx_last_name\nWHERE last_name = 'Smith';<\/code><\/pre>\n\n\n\n
    \u5728\u8fd9\u4e2a\u67e5\u8be2\u4e2d\uff0cINDEXED BY idx_last_name<\/code> \u544a\u8bc9 SQLite \u5f3a\u5236\u4f7f\u7528 idx_last_name<\/code> \u7d22\u5f15\u6765\u4f18\u5316\u67e5\u8be2\uff0c\u5373\u4f7f SQLite \u4f1a\u6839\u636e\u67e5\u8be2\u7684\u60c5\u51b5\u81ea\u52a8\u9009\u62e9\u7d22\u5f15\u3002<\/p>\n\n\n\n
    3. \u4e3a\u4ec0\u4e48\u4f7f\u7528 INDEXED BY<\/code>\uff1f<\/h3>\n\n\n\n
      \n
    • \u4f18\u5316\u67e5\u8be2<\/strong>\uff1a\u5982\u679c\u4f60\u77e5\u9053\u67d0\u4e2a\u7d22\u5f15\u5728\u7279\u5b9a\u67e5\u8be2\u4e2d\u4f1a\u66f4\u6709\u6548\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 INDEXED BY<\/code> \u5f3a\u5236\u67e5\u8be2\u4f7f\u7528\u8be5\u7d22\u5f15\u3002<\/li>\n\n\n\n
    • \u907f\u514d SQLite \u9519\u8bef\u9009\u62e9\u7d22\u5f15<\/strong>\uff1a\u6709\u65f6\uff0cSQLite \u4f1a\u9009\u62e9\u4e00\u4e2a\u4e0d\u592a\u6709\u6548\u7684\u7d22\u5f15\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7 INDEXED BY<\/code> \u63d0\u4f9b\u660e\u786e\u7684\u7d22\u5f15\u6765\u63d0\u5347\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n
      4. \u4f7f\u7528 INDEXED BY<\/code> \u65f6\u7684\u6ce8\u610f\u4e8b\u9879<\/h3>\n\n\n\n
        \n
      • \u7d22\u5f15\u9009\u62e9\u6027<\/strong>\uff1aINDEXED BY<\/code> \u901a\u5e38\u7528\u6765\u6307\u5b9a\u4e00\u4e2a\u9ad8\u9009\u62e9\u6027\u7684\u7d22\u5f15\uff08\u5373\u5305\u542b\u8bb8\u591a\u4e0d\u540c\u503c\u7684\u5217\uff09\u4ee5\u52a0\u901f\u67e5\u8be2\u3002\u5982\u679c\u4f60\u5f3a\u5236\u4f7f\u7528\u4e00\u4e2a\u4f4e\u9009\u62e9\u6027\u7684\u7d22\u5f15\uff0c\u53ef\u80fd\u4e0d\u4f1a\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n\n\n\n
      • \u67e5\u8be2\u4f18\u5316<\/strong>\uff1a\u867d\u7136 INDEXED BY<\/code> \u53ef\u4ee5\u5e2e\u52a9\u4f18\u5316\u67e5\u8be2\uff0c\u4f46\u4e00\u822c\u60c5\u51b5\u4e0b\uff0cSQLite \u4f1a\u81ea\u52a8\u9009\u62e9\u6700\u4f73\u7d22\u5f15\u3002\u56e0\u6b64\uff0c\u6700\u597d\u53ea\u5728\u77e5\u9053\u67d0\u4e2a\u7d22\u5f15\u4f1a\u66f4\u9ad8\u6548\u65f6\u4f7f\u7528 INDEXED BY<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n
        5. \u67e5\u8be2\u793a\u4f8b\uff1a\u5e26\u6709\u591a\u4e2a\u7d22\u5f15<\/h3>\n\n\n\n
        \u5047\u8bbe\u4f60\u6709\u4e00\u4e2a employees<\/code> \u8868\uff0c\u4e14\u4f60\u4e3a last_name<\/code> \u548c department<\/code> \u521b\u5efa\u4e86\u7d22\u5f15\u3002\u4f60\u53ef\u4ee5\u9009\u62e9\u5f3a\u5236\u4f7f\u7528\u4e00\u4e2a\u7279\u5b9a\u7684\u7d22\u5f15\uff1a<\/p>\n\n\n\n
        CREATE INDEX idx_department ON employees (department);<\/code><\/pre>\n\n\n\n
        \u4f7f\u7528 INDEXED BY<\/code> \u67e5\u8be2\uff1a<\/strong><\/p>\n\n\n\n
        SELECT * FROM employees\nINDEXED BY idx_last_name\nWHERE last_name = 'Smith' AND department = 'HR';<\/code><\/pre>\n\n\n\n
        \u5728\u8fd9\u4e2a\u67e5\u8be2\u4e2d\uff0cINDEXED BY idx_last_name<\/code> \u5f3a\u5236\u4f7f\u7528 idx_last_name<\/code> \u7d22\u5f15\u8fdb\u884c\u67e5\u8be2\uff0c\u5373\u4f7f\u67e5\u8be2\u6761\u4ef6\u4e2d\u4e5f\u5305\u62ec department<\/code> \u5217\uff0c\u4e14\u8be5\u5217\u6709\u4e00\u4e2a\u5355\u72ec\u7684\u7d22\u5f15 idx_department<\/code>\u3002<\/p>\n\n\n\n
        6. \u603b\u7ed3<\/h3>\n\n\n\n
        INDEXED BY<\/code> \u63d0\u4f9b\u4e86\u4e00\u79cd\u663e\u5f0f\u9009\u62e9\u7d22\u5f15\u7684\u65b9\u5f0f\uff0c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u4ee5\u5e2e\u52a9\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u3002\u7136\u800c\uff0c\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0cSQLite \u4f1a\u81ea\u52a8\u9009\u62e9\u6700\u4f18\u7684\u7d22\u5f15\uff0c\u6240\u4ee5\u53ea\u6709\u5728\u4f60\u786e\u4fe1\u67d0\u4e2a\u7279\u5b9a\u7d22\u5f15\u4f1a\u66f4\u9ad8\u6548\u65f6\uff0c\u624d\u9700\u8981\u4f7f\u7528 INDEXED BY<\/code>\u3002\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u5728 SQLite \u4e2d\uff0cINDEXED BY \u662f\u4e00\u4e2a\u5173\u952e\u5b57\uff0c\u7528\u4e8e\u6307\u5b9a\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3002\u901a\u5e38\uff0cSQLite  […]<\/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-2364","post","type-post","status-publish","format-standard","hentry","category-sqlite"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2364","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=2364"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2364\/revisions"}],"predecessor-version":[{"id":2365,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2364\/revisions\/2365"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2364"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2364"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2364"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}