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

執行類似如下SQL時：

select a.xxx
from a bjdm, b
where a.id=b.id and a.yyy='20000007' ;

 

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

 

解決辦法：
alter table a convert to character set utf8mb4 collate utf8mb4_general_ci;

alter table b convert to character set utf8mb4 collate utf8mb4_general_ci;