{"id":2324,"date":"2025-03-04T08:38:57","date_gmt":"2025-03-04T00:38:57","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2324"},"modified":"2025-03-04T08:38:57","modified_gmt":"2025-03-04T00:38:57","slug":"sqlite-where-%e5%ad%90%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/04\/sqlite-where-%e5%ad%90%e5%8f%a5\/","title":{"rendered":"SQLite WHERE \u5b50\u53e5"},"content":{"rendered":"\n
\n

WHERE<\/code> \u5b50\u53e5\u7528\u4e8e\u6307\u5b9a SQL \u67e5\u8be2\u4e2d\u7684\u6761\u4ef6\uff0c\u5e2e\u52a9\u8fc7\u6ee4\u8fd4\u56de\u7684\u8bb0\u5f55\u3002\u5b83\u7528\u4e8e\u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u7b5b\u9009\uff0c\u53ea\u8fd4\u56de\u7b26\u5408\u6761\u4ef6\u7684\u884c\u3002WHERE<\/code> \u5b50\u53e5\u53ef\u4ee5\u7528\u4e8e SELECT<\/code>\u3001UPDATE<\/code>\u3001DELETE<\/code> \u7b49 SQL \u8bed\u53e5\u4e2d\u3002<\/p>\n<\/blockquote>\n\n\n\n

1. \u57fa\u672c\u7528\u6cd5<\/strong><\/h3>\n\n\n\n

\u5728 SQL \u67e5\u8be2\u4e2d\uff0cWHERE<\/code> \u5b50\u53e5\u7d27\u8ddf\u5728 FROM<\/code> \u5b50\u53e5\u4e4b\u540e\uff0c\u7528\u4e8e\u6307\u5b9a\u6761\u4ef6\u3002<\/p>\n\n\n\n

\u793a\u4f8b\uff1a<\/strong><\/h4>\n\n\n\n
SELECT * FROM employees WHERE age > 30;<\/code><\/pre>\n\n\n\n
    \n
  • \u8be5\u67e5\u8be2\u5c06\u4ece employees<\/code> \u8868\u4e2d\u9009\u53d6\u6240\u6709\u5e74\u9f84\u5927\u4e8e 30 \u7684\u5458\u5de5\u3002<\/li>\n<\/ul>\n\n\n\n
    2. \u4f7f\u7528\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/strong><\/h3>\n\n\n\n
    WHERE<\/code> \u5b50\u53e5\u652f\u6301\u5404\u79cd\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff0c\u7528\u4e8e\u6bd4\u8f83\u5217\u7684\u503c\u3002<\/p>\n\n\n\n
    \u8fd0\u7b97\u7b26<\/th>\u63cf\u8ff0<\/th>\u793a\u4f8b<\/th><\/tr><\/thead>
    =<\/code><\/td>\u7b49\u4e8e<\/td>WHERE age = 30<\/code><\/td><\/tr>
    !=<\/code> \u6216 <><\/code><\/td>\u4e0d\u7b49\u4e8e<\/td>WHERE age != 30<\/code> \u6216 WHERE age <> 30<\/code><\/td><\/tr>
    ><\/code><\/td>\u5927\u4e8e<\/td>WHERE age > 30<\/code><\/td><\/tr>
    <<\/code><\/td>\u5c0f\u4e8e<\/td>WHERE age < 30<\/code><\/td><\/tr>
    >=<\/code><\/td>\u5927\u4e8e\u7b49\u4e8e<\/td>WHERE age >= 30<\/code><\/td><\/tr>
    <=<\/code><\/td>\u5c0f\u4e8e\u7b49\u4e8e<\/td>WHERE age <= 30<\/code><\/td><\/tr>
    BETWEEN<\/code><\/td>\u8303\u56f4\u68c0\u67e5\uff0c\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u5728\u4e24\u4e2a\u503c\u4e4b\u95f4\uff08\u5305\u542b\u8fb9\u754c\uff09<\/td>WHERE age BETWEEN 20 AND 30<\/code><\/td><\/tr>
    IN<\/code><\/td>\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u5b58\u5728\u4e8e\u4e00\u7ec4\u503c\u4e2d<\/td>WHERE age IN (20, 30, 40)<\/code><\/td><\/tr>
    LIKE<\/code><\/td>\u6a21\u7cca\u5339\u914d\u5b57\u7b26\u4e32<\/td>WHERE name LIKE 'A%'<\/code><\/td><\/tr>
    IS NULL<\/code><\/td>\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u4e3a NULL<\/td>WHERE name IS NULL<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \u793a\u4f8b\uff1a<\/strong><\/h4>\n\n\n\n
    SELECT * FROM employees WHERE name LIKE 'A%';<\/code><\/pre>\n\n\n\n
      \n
    • \u8be5\u67e5\u8be2\u5c06\u9009\u51fa\u6240\u6709\u540d\u5b57\u4ee5 A<\/code> \u5f00\u5934\u7684\u5458\u5de5\u3002<\/li>\n<\/ul>\n\n\n\n
      3. \u903b\u8f91\u8fd0\u7b97\u7b26<\/strong><\/h3>\n\n\n\n
      WHERE<\/code> \u5b50\u53e5\u53ef\u4ee5\u4f7f\u7528 AND<\/code>, OR<\/code>, NOT<\/code> \u7b49\u903b\u8f91\u8fd0\u7b97\u7b26\u8fde\u63a5\u591a\u4e2a\u6761\u4ef6\u3002<\/p>\n\n\n\n
      \u8fd0\u7b97\u7b26<\/th>\u63cf\u8ff0<\/th>\u793a\u4f8b<\/th><\/tr><\/thead>
      AND<\/code><\/td>\u4e24\u4e2a\u6761\u4ef6\u90fd\u4e3a\u771f\u65f6\u8fd4\u56de\u771f<\/td>WHERE age > 20 AND name = 'John'<\/code><\/td><\/tr>
      OR<\/code><\/td>\u4efb\u4e00\u6761\u4ef6\u4e3a\u771f\u65f6\u8fd4\u56de\u771f<\/td>WHERE age < 20 OR age > 60<\/code><\/td><\/tr>
      NOT<\/code><\/td>\u5bf9\u6761\u4ef6\u53d6\u53cd<\/td>WHERE NOT age = 30<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \u793a\u4f8b\uff1a<\/strong><\/h4>\n\n\n\n
      SELECT * FROM employees WHERE age > 30 AND department = 'HR';<\/code><\/pre>\n\n\n\n
        \n
      • \u8be5\u67e5\u8be2\u5c06\u9009\u51fa\u6240\u6709\u5e74\u9f84\u5927\u4e8e 30 \u4e14\u5c5e\u4e8e HR<\/code> \u90e8\u95e8\u7684\u5458\u5de5\u3002<\/li>\n<\/ul>\n\n\n\n
        4. IS NULL<\/code> \u548c IS NOT NULL<\/code><\/strong><\/h3>\n\n\n\n
        IS NULL<\/code> \u7528\u4e8e\u68c0\u67e5\u5217\u662f\u5426\u4e3a NULL<\/code> \u503c\uff0cIS NOT NULL<\/code> \u7528\u4e8e\u68c0\u67e5\u5217\u662f\u5426\u4e0d\u662f NULL<\/code> \u503c\u3002<\/p>\n\n\n\n
        \u793a\u4f8b\uff1a<\/strong><\/h4>\n\n\n\n
        SELECT * FROM employees WHERE department IS NULL;<\/code><\/pre>\n\n\n\n
          \n
        • \u8be5\u67e5\u8be2\u9009\u51fa\u6240\u6709\u6ca1\u6709\u6307\u5b9a\u90e8\u95e8\u7684\u5458\u5de5\uff08\u5373 department<\/code> \u4e3a NULL<\/code> \u7684\u5458\u5de5\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
          5. BETWEEN<\/code> \u64cd\u4f5c\u7b26<\/strong><\/h3>\n\n\n\n
          BETWEEN<\/code> \u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u5728\u4e24\u4e2a\u7ed9\u5b9a\u7684\u8303\u56f4\u5185\uff08\u5305\u62ec\u8fb9\u754c\u503c\uff09\u3002<\/p>\n\n\n\n
          \u793a\u4f8b\uff1a<\/strong><\/h4>\n\n\n\n
          SELECT * FROM employees WHERE salary BETWEEN 3000 AND 5000;<\/code><\/pre>\n\n\n\n
            \n
          • \u8be5\u67e5\u8be2\u5c06\u9009\u51fa\u6240\u6709\u5de5\u8d44\u5728 3000 \u5230 5000 \u4e4b\u95f4\u7684\u5458\u5de5\u3002<\/li>\n<\/ul>\n\n\n\n
            6. IN<\/code> \u64cd\u4f5c\u7b26<\/strong><\/h3>\n\n\n\n
            IN<\/code> \u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a\u503c\u662f\u5426\u5b58\u5728\u4e8e\u6307\u5b9a\u7684\u4e00\u7ec4\u503c\u4e2d\u3002<\/p>\n\n\n\n
            \u793a\u4f8b\uff1a<\/strong><\/h4>\n\n\n\n
            SELECT * FROM employees WHERE department IN ('HR', 'Finance', 'IT');<\/code><\/pre>\n\n\n\n
              \n
            • \u8be5\u67e5\u8be2\u5c06\u9009\u51fa\u6240\u6709\u5c5e\u4e8e HR<\/code>\u3001Finance<\/code> \u6216 IT<\/code> \u90e8\u95e8\u7684\u5458\u5de5\u3002<\/li>\n<\/ul>\n\n\n\n
              7. LIKE<\/code> \u64cd\u4f5c\u7b26<\/strong><\/h3>\n\n\n\n
              LIKE<\/code> \u7528\u4e8e\u8fdb\u884c\u6a21\u7cca\u5339\u914d\u3002\u5b83\u53ef\u4ee5\u4f7f\u7528\u901a\u914d\u7b26 %<\/code>\uff08\u5339\u914d\u4efb\u610f\u5b57\u7b26\uff09\u548c _<\/code>\uff08\u5339\u914d\u5355\u4e2a\u5b57\u7b26\uff09\u3002<\/p>\n\n\n\n
              \u901a\u914d\u7b26<\/th>\u63cf\u8ff0<\/th>\u793a\u4f8b<\/th><\/tr><\/thead>
              %<\/code><\/td>\u5339\u914d\u4efb\u610f\u6570\u91cf\u7684\u5b57\u7b26\uff08\u5305\u62ec\u96f6\u4e2a\u5b57\u7b26\uff09<\/td>'A%'<\/code> \u5339\u914d\u6240\u6709\u4ee5 A<\/code> \u5f00\u5934\u7684\u5b57\u7b26\u4e32<\/td><\/tr>
              _<\/code><\/td>\u5339\u914d\u5355\u4e2a\u5b57\u7b26<\/td>'A_<\/code>‘ \u5339\u914d\u6240\u6709\u4ee5 A<\/code> \u5f00\u5934\uff0c\u540e\u9762\u8ddf\u4e00\u4e2a\u5b57\u7b26\u7684\u5b57\u7b26\u4e32<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
              \u793a\u4f8b\uff1a<\/strong><\/h4>\n\n\n\n
              SELECT * FROM employees WHERE name LIKE 'A%';<\/code><\/pre>\n\n\n\n
                \n
              • \u8be5\u67e5\u8be2\u5c06\u9009\u51fa\u6240\u6709\u540d\u5b57\u4ee5 A<\/code> \u5f00\u5934\u7684\u5458\u5de5\u3002<\/li>\n<\/ul>\n\n\n\n
                8. \u4f7f\u7528 OR<\/code> \u548c AND<\/code> \u7ec4\u5408<\/strong><\/h3>\n\n\n\n
                \u4f60\u53ef\u4ee5\u4f7f\u7528 OR<\/code> \u548c AND<\/code> \u6765\u7ec4\u5408\u591a\u4e2a\u6761\u4ef6\u3002<\/p>\n\n\n\n
                \u793a\u4f8b\uff1a<\/strong><\/h4>\n\n\n\n
                SELECT * FROM employees WHERE age > 30 AND (department = 'HR' OR department = 'Finance');<\/code><\/pre>\n\n\n\n
                  \n
                • \u8be5\u67e5\u8be2\u5c06\u9009\u51fa\u6240\u6709\u5e74\u9f84\u5927\u4e8e 30 \u4e14\u5c5e\u4e8e HR<\/code> \u6216 Finance<\/code> \u90e8\u95e8\u7684\u5458\u5de5\u3002<\/li>\n<\/ul>\n\n\n\n
                  9. \u7ec4\u5408\u591a\u4e2a\u6761\u4ef6<\/strong><\/h3>\n\n\n\n
                  \u4f60\u53ef\u4ee5\u4f7f\u7528\u591a\u4e2a\u6761\u4ef6\u5728 WHERE<\/code> \u5b50\u53e5\u4e2d\u8fdb\u884c\u590d\u6742\u7b5b\u9009\u3002<\/p>\n\n\n\n
                  \u793a\u4f8b\uff1a<\/strong><\/h4>\n\n\n\n
                  SELECT * FROM employees WHERE age > 30 AND department = 'IT' AND salary > 4000;<\/code><\/pre>\n\n\n\n
                    \n
                  • \u8be5\u67e5\u8be2\u5c06\u9009\u51fa\u6240\u6709\u5e74\u9f84\u5927\u4e8e 30\u3001\u5c5e\u4e8e IT<\/code> \u90e8\u95e8\u4e14\u5de5\u8d44\u5927\u4e8e 4000 \u7684\u5458\u5de5\u3002<\/li>\n<\/ul>\n\n\n\n
                    \n\n\n\n
                    \u603b\u7ed3<\/strong><\/h2>\n\n\n\n
                      \n
                    • \u57fa\u672c\u7528\u6cd5<\/strong>\uff1a\u7528\u4e8e\u5728\u67e5\u8be2\u4e2d\u7b5b\u9009\u7b26\u5408\u6761\u4ef6\u7684\u8bb0\u5f55\u3002<\/li>\n\n\n\n
                    • \u5e38\u89c1\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/strong>\uff1a=<\/code>, !=<\/code>, ><\/code>, <<\/code>, BETWEEN<\/code>, IN<\/code>, LIKE<\/code>, IS NULL<\/code> \u7b49\u3002<\/li>\n\n\n\n
                    • \u903b\u8f91\u8fd0\u7b97\u7b26<\/strong>\uff1a\u7528\u4e8e\u8fde\u63a5\u591a\u4e2a\u6761\u4ef6\uff0c\u5982 AND<\/code>, OR<\/code>, NOT<\/code>\u3002<\/li>\n\n\n\n
                    • \u8303\u56f4\u68c0\u67e5<\/strong>\uff1a\u4f7f\u7528 BETWEEN<\/code> \u548c IN<\/code>\u3002<\/li>\n\n\n\n
                    • \u6a21\u7cca\u5339\u914d<\/strong>\uff1a\u4f7f\u7528 LIKE<\/code> \u8fdb\u884c\u5b57\u7b26\u4e32\u5339\u914d\u3002<\/li>\n\n\n\n
                    • \u7a7a\u503c\u68c0\u67e5<\/strong>\uff1a\u4f7f\u7528 IS NULL<\/code> \u548c IS NOT NULL<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n
                      WHERE<\/code> \u5b50\u53e5\u662f SQL \u67e5\u8be2\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u90e8\u5206\uff0c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u7b5b\u9009\u548c\u7cbe\u786e\u63a7\u5236\u67e5\u8be2\u7ed3\u679c\u3002\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                      WHERE \u5b50\u53e5\u7528\u4e8e\u6307\u5b9a SQL \u67e5\u8be2\u4e2d\u7684\u6761\u4ef6\uff0c\u5e2e\u52a9\u8fc7\u6ee4\u8fd4\u56de\u7684\u8bb0\u5f55\u3002\u5b83\u7528\u4e8e\u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u7b5b\u9009\uff0c\u53ea\u8fd4\u56de\u7b26\u5408\u6761\u4ef6\u7684 […]<\/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-2324","post","type-post","status-publish","format-standard","hentry","category-sqlite"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2324","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=2324"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2324\/revisions"}],"predecessor-version":[{"id":2325,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2324\/revisions\/2325"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2324"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2324"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2324"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}