Illegal mix of collations

原因：
创建表的时候未设置COLLATE

临时解决：

CONVERT(rr.operator_id USING utf8) COLLATE utf8_unicode_ci = CONVERT(pw.id USING utf8) COLLATE utf8_unicode_ci

参考：
https://blog.csdn.net/weixin_43543654/article/details/128862974

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collations Illegal mix ofcollations illegal mix of collations operation illegal问题 illegal collation collate collations collate_fn locale-collate character multibyte position illegal collator