153-Illegal mix of collations for operation 'UNION'

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2022-12-23

使用union all 查询，报错：

Illegal mix of collations for operation 'UNION'

相同字段的编码为 utf8_general_ci 与 utf8_unicode_ci ，就会报Illegal mix of collations for operation “UNION”的错误。 解决1：

CONVERT('ABC' USING utf8mb4)

解决2： 直接修改对应字段的编码

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