Redshift group cannot be dropped because permission dependency is found

You can drop a group, after you revoke any permissions that the group has for objects to do this please follow the below steps.

1. Download the v_generate_user_grant_revoke_ddl.sql from the AWS Labs GitHub repository.
2. Find the permissions granted to the group using the below SQL.

 select ddl from admin.v_generate_user_grant_revoke_ddl where ddltype='revoke' and grantee= 'group <group-name>'; 

3. Find all granted permissions by group that you want to drop. Then, re-apply those permissions as another group.
4. Drop the group.

Yes, I have done this as well but select statement not returning anything.