Illegal mix of collations (utf8mb4_general_ci,IMPLICIT) and (utf8mb4_unicode_ci,IMPLICIT) for operation '='

这个错误提示是与MySQL数据库中的字符集(collation)相关的问题。它表示在进行比较操作时，出现了不同的字符集的混合。通常，这个错误会出现在数据库查询语句中的操作符(比如=、<>等)的两边使用了不同的字符集。比如，utf8mb4_general_ci和utf8mb4_unicode_ci是两种不同的字符集，当它们混合使用时就会导致此错误。

解决这个问题的方法是确保在进行比较操作时，两边使用相同的字符集。可以通过在比较操作符两边使用COLLATE关键字来指定相同的字符集。

例如，如果你的查询是这样的：SELECT * FROM table WHERE column1 = 'value'，你可以修改为：SELECT * FROM table WHERE column1 COLLATE utf8mb4_general_ci = 'value'。这样就可以避免字符集混合导致的错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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