mysql字符集问题Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_estonian_ci,IMPLICIT) for o

Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_estonian_ci,IMPLICIT) for operation '

在连表查询的时候，表之间的编码不一致导致的

解决方式 ：

ALTER TABLE users CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;