{"id":800,"date":"2025-01-11T00:10:04","date_gmt":"2025-01-10T16:10:04","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=800"},"modified":"2025-01-11T00:10:04","modified_gmt":"2025-01-10T16:10:04","slug":"%e6%83%b3%e8%a6%81%e5%9c%a8sql-where-%e5%ad%90%e5%8f%a5%e4%b8%ad%e5%ae%9e%e7%8e%b0%e6%9d%a1%e4%bb%b6%e9%80%bb%e8%be%91%ef%bc%8c%e6%9c%89%e5%93%aa%e4%ba%9b%e6%96%b9%e6%b3%95%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/01\/11\/%e6%83%b3%e8%a6%81%e5%9c%a8sql-where-%e5%ad%90%e5%8f%a5%e4%b8%ad%e5%ae%9e%e7%8e%b0%e6%9d%a1%e4%bb%b6%e9%80%bb%e8%be%91%ef%bc%8c%e6%9c%89%e5%93%aa%e4%ba%9b%e6%96%b9%e6%b3%95%ef%bc%9f\/","title":{"rendered":"\u60f3\u8981\u5728SQL\u00a0WHERE\u00a0\u5b50\u53e5\u4e2d\u5b9e\u73b0\u6761\u4ef6\u903b\u8f91\uff0c\u6709\u54ea\u4e9b\u65b9\u6cd5\uff1f"},"content":{"rendered":"\n
\n

\u5728 SQL WHERE<\/code> \u5b50\u53e5\u4e2d\u5b9e\u73b0\u6761\u4ef6\u903b\u8f91\uff0c\u901a\u5e38\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\uff1a<\/p>\n<\/blockquote>\n\n\n\n

\n\n\n\n

1. \u4f7f\u7528 AND<\/code> \u548c OR<\/code> \u8fdb\u884c\u591a\u6761\u4ef6\u7ec4\u5408<\/h3>\n\n\n\n

AND<\/code> \u548c OR<\/code> \u5141\u8bb8\u4f60\u5c06\u591a\u4e2a\u6761\u4ef6\u7ed3\u5408\u5728\u4e00\u8d77\uff0c\u5b9a\u4e49\u66f4\u590d\u6742\u7684\u67e5\u8be2\u903b\u8f91\u3002<\/p>\n\n\n\n

    \n
  • AND<\/code><\/strong>: \u6240\u6709\u6761\u4ef6\u90fd\u5fc5\u987b\u4e3a\u771f\uff0c\u624d\u80fd\u8fd4\u56de\u7ed3\u679c\u3002<\/li>\n\n\n\n
  • OR<\/code><\/strong>: \u53ea\u8981\u6709\u4e00\u4e2a\u6761\u4ef6\u4e3a\u771f\uff0c\u67e5\u8be2\u7ed3\u679c\u5c31\u4f1a\u8fd4\u56de\u3002<\/li>\n<\/ul>\n\n\n\n
    SELECT * FROM employees\nWHERE department = 'Sales' AND salary > 50000;<\/code><\/pre>\n\n\n\n
    \u8fd9\u6761\u8bed\u53e5\u4f1a\u8fd4\u56de\u6240\u6709\u5728 Sales<\/strong> \u90e8\u95e8\u4e14 \u5de5\u8d44\u5927\u4e8e 50000<\/strong> \u7684\u5458\u5de5\u3002<\/p>\n\n\n\n
    SELECT * FROM employees\nWHERE department = 'Sales' OR department = 'Marketing';<\/code><\/pre>\n\n\n\n
    \u8fd9\u6761\u8bed\u53e5\u4f1a\u8fd4\u56de\u6240\u6709\u5728 Sales<\/strong> \u6216 Marketing<\/strong> \u90e8\u95e8\u7684\u5458\u5de5\u3002<\/p>\n\n\n\n
    \n\n\n\n
    2. \u4f7f\u7528 NOT<\/code> \u6392\u9664\u7279\u5b9a\u6761\u4ef6<\/h3>\n\n\n\n
    NOT<\/code> \u7528\u4e8e\u6392\u9664\u67d0\u4e2a\u6761\u4ef6\uff0c\u4f7f\u5f97\u67e5\u8be2\u7ed3\u679c\u4e0d\u5305\u542b\u7b26\u5408\u8be5\u6761\u4ef6\u7684\u884c\u3002<\/p>\n\n\n\n
    SELECT * FROM employees\nWHERE NOT department = 'Sales';<\/code><\/pre>\n\n\n\n
    \u8fd9\u6761\u8bed\u53e5\u4f1a\u8fd4\u56de\u6240\u6709 \u4e0d\u5728 Sales \u90e8\u95e8<\/strong> \u7684\u5458\u5de5\u3002<\/p>\n\n\n\n
    \n\n\n\n
    3. \u4f7f\u7528 BETWEEN<\/code> \u8303\u56f4\u6761\u4ef6<\/h3>\n\n\n\n
    BETWEEN<\/code> \u7528\u4e8e\u9009\u62e9\u4e00\u4e2a\u8303\u56f4\u5185\u7684\u503c\uff08\u5305\u62ec\u8fb9\u754c\u503c\uff09\u3002<\/p>\n\n\n\n
    SELECT * FROM employees\nWHERE salary BETWEEN 40000 AND 70000;<\/code><\/pre>\n\n\n\n
    \u8fd9\u6761\u8bed\u53e5\u4f1a\u8fd4\u56de\u6240\u6709 \u5de5\u8d44\u5728 40000 \u5230 70000 \u4e4b\u95f4<\/strong> \u7684\u5458\u5de5\u3002<\/p>\n\n\n\n
    \n\n\n\n
    4. \u4f7f\u7528 IN<\/code> \u68c0\u67e5\u591a\u4e2a\u503c<\/h3>\n\n\n\n
    IN<\/code> \u7528\u4e8e\u68c0\u67e5\u67d0\u4e2a\u5b57\u6bb5\u7684\u503c\u662f\u5426\u5728\u4e00\u7ec4\u6307\u5b9a\u7684\u503c\u4e4b\u4e2d\u3002<\/p>\n\n\n\n
    SELECT * FROM employees\nWHERE department IN ('Sales', 'Marketing', 'HR');<\/code><\/pre>\n\n\n\n
    \u8fd9\u6761\u8bed\u53e5\u4f1a\u8fd4\u56de\u6240\u6709 \u5728 Sales\u3001Marketing \u6216 HR \u90e8\u95e8<\/strong> \u7684\u5458\u5de5\u3002<\/p>\n\n\n\n
    \n\n\n\n
    5. \u4f7f\u7528 LIKE<\/code> \u8fdb\u884c\u6a21\u7cca\u5339\u914d<\/h3>\n\n\n\n
    LIKE<\/code> \u7528\u4e8e\u6a21\u7cca\u5339\u914d\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u4f7f\u7528\u901a\u914d\u7b26\uff1a<\/p>\n\n\n\n
      \n
    • %<\/code>\uff1a\u8868\u793a\u4efb\u610f\u591a\u4e2a\u5b57\u7b26\u3002<\/li>\n\n\n\n
    • _<\/code>\uff1a\u8868\u793a\u5355\u4e2a\u5b57\u7b26\u3002<\/li>\n<\/ul>\n\n\n\n
      SELECT * FROM employees\nWHERE name LIKE 'J%';<\/code><\/pre>\n\n\n\n
      \u8fd9\u6761\u8bed\u53e5\u4f1a\u8fd4\u56de\u6240\u6709 \u540d\u5b57\u4ee5 J \u5f00\u5934<\/strong> \u7684\u5458\u5de5\u3002<\/p>\n\n\n\n
      SELECT * FROM employees\nWHERE name LIKE '_o%';<\/code><\/pre>\n\n\n\n
      \u8fd9\u6761\u8bed\u53e5\u4f1a\u8fd4\u56de\u6240\u6709 \u540d\u5b57\u7b2c\u4e8c\u4e2a\u5b57\u7b26\u662f o<\/strong> \u7684\u5458\u5de5\u3002<\/p>\n\n\n\n
      \n\n\n\n
      6. \u4f7f\u7528 IS NULL<\/code> \u6216 IS NOT NULL<\/code><\/h3>\n\n\n\n
      \u7528\u4e8e\u68c0\u67e5\u5217\u7684\u503c\u662f\u5426\u4e3a NULL<\/code> \u6216\u4e0d\u662f NULL<\/code>\u3002<\/p>\n\n\n\n
      SELECT * FROM employees\nWHERE manager_id IS NULL;<\/code><\/pre>\n\n\n\n
      \u8fd9\u6761\u8bed\u53e5\u4f1a\u8fd4\u56de\u6240\u6709 \u6ca1\u6709\u7ecf\u7406\u7684\u5458\u5de5<\/strong>\u3002<\/p>\n\n\n\n
      \n\n\n\n
      7. \u590d\u6742\u7684\u6761\u4ef6\u7ec4\u5408<\/h3>\n\n\n\n
      \u4f60\u53ef\u4ee5\u7ed3\u5408 AND<\/code>, OR<\/code>, NOT<\/code> \u548c\u62ec\u53f7 ()<\/code> \u6765\u6784\u9020\u66f4\u590d\u6742\u7684\u903b\u8f91\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n
      SELECT * FROM employees\nWHERE (department = 'Sales' AND salary > 50000)\n   OR (department = 'Marketing' AND salary > 40000);<\/code><\/pre>\n\n\n\n
      \u8fd9\u6761\u8bed\u53e5\u4f1a\u8fd4\u56de\u6240\u6709 Sales \u90e8\u95e8\u4e14\u5de5\u8d44\u5927\u4e8e 50000<\/strong> \u6216 Marketing \u90e8\u95e8\u4e14\u5de5\u8d44\u5927\u4e8e 40000<\/strong> \u7684\u5458\u5de5\u3002<\/p>\n\n\n\n
      \n\n\n\n
      8. \u4f7f\u7528 CASE<\/code> \u8fdb\u884c\u6761\u4ef6\u5224\u65ad<\/h3>\n\n\n\n
      \u5728 WHERE<\/code> \u5b50\u53e5\u4e2d\u4f7f\u7528 CASE<\/code> \u8bed\u53e5\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u6761\u4ef6\u903b\u8f91\uff0c\u867d\u7136\u5b83\u4e0d\u5982 AND<\/code> \u548c OR<\/code> \u90a3\u4e48\u5e38\u89c1\uff0c\u4f46\u6709\u65f6\u7528\u4e8e\u66f4\u590d\u6742\u7684\u6761\u4ef6\u5224\u65ad\u3002<\/p>\n\n\n\n
      SELECT * FROM employees\nWHERE \n    CASE \n        WHEN department = 'Sales' THEN salary > 50000\n        WHEN department = 'Marketing' THEN salary > 40000\n        ELSE false\n    END;<\/code><\/pre>\n\n\n\n
      \u8fd9\u79cd\u65b9\u6cd5\u901a\u5e38\u7528\u4e8e\u66f4\u590d\u6742\u7684\u52a8\u6001\u903b\u8f91\u3002<\/p>\n\n\n\n
      \n\n\n\n
      \u793a\u4f8b\u603b\u7ed3<\/h3>\n\n\n\n
      \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5458\u5de5\u8868 employees<\/code>\uff0c\u5305\u542b\u4ee5\u4e0b\u5217\uff1aid<\/code>\u3001name<\/code>\u3001department<\/code> \u548c salary<\/code>\u3002<\/p>\n\n\n\n
      SELECT * FROM employees\nWHERE (department = 'Sales' AND salary > 50000) OR (department = 'Marketing' AND salary < 30000);<\/code><\/pre>\n\n\n\n
      \u8fd9\u4e2a\u67e5\u8be2\u4f1a\u8fd4\u56de\uff1a<\/p>\n\n\n\n
        \n
      • \u6240\u6709 Sales \u90e8\u95e8\u4e14\u5de5\u8d44\u5927\u4e8e 50000<\/strong> \u7684\u5458\u5de5\uff0c\u6216\u8005<\/li>\n\n\n\n
      • \u6240\u6709 Marketing \u90e8\u95e8\u4e14\u5de5\u8d44\u4f4e\u4e8e 30000<\/strong> \u7684\u5458\u5de5\u3002<\/li>\n<\/ul>\n\n\n\n
        \u901a\u8fc7\u8fd9\u4e9b\u65b9\u5f0f\uff0c\u4f60\u53ef\u4ee5\u7075\u6d3b\u5730\u5728 WHERE<\/code> \u5b50\u53e5\u4e2d\u5b9e\u73b0\u590d\u6742\u7684\u6761\u4ef6\u903b\u8f91\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u5728 SQL WHERE \u5b50\u53e5\u4e2d\u5b9e\u73b0\u6761\u4ef6\u903b\u8f91\uff0c\u901a\u5e38\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\uff1a 1. \u4f7f\u7528 AND \u548c OR \u8fdb\u884c\u591a\u6761 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-800","post","type-post","status-publish","format-standard","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/800","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=800"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/800\/revisions"}],"predecessor-version":[{"id":801,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/800\/revisions\/801"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=800"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=800"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}