Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_unicode_ci,IMPLIC

eg:Select * from 数据库A.表A where name not in (select name from 数据库B.表B)

出现 ： Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_unicode_ci,IMPLICIT) for operation '='
错误警告

解决办法:
Select * from 数据库A.表A where convert(name using utf8) not in (select convert(name using utf8) from 数据库B.表B)