Illegal mix of collations (utf8mb4_unicode_ci,IMPLICIT) and (utf8mb4_general_ci,IMPLICIT)

1.修改字段的字符編碼

ALTER TABLE table_name MODIFY COLUMN column_name VARCHAR(500) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT “” COMMENT ‘字段備註’;

2.在‘=’左邊或者右邊加上字符編碼描述COLLATE utf8mb4_general_ci

select a.userid,b.nickname,a.createdate,a.praisetimes from wenxue_dynamic.dynamic_comment a left join wenxue_user.userinfo b on a.userid COLLATE utf8mb4_general_ci =b.userid where a.typeid='1910292038501101499' and a.commentid='' order by a.createdate asc;