mysql "Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE) fo...

错误:"Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE) for operation '='"
需要把字符集排序规则改为utf8mb4
数据库,表,字段都要改

mysql
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