GrantRoleMembership grants role membership of the target 'role' to the 'currentUser' This is used to perform commands if user is not a superuser For instance, when using AWS RDS, user is not given superuser It returns false if the grant is not needed because the user is already a member of this role.

DefaultGrant defines a template of privileges that Role will be granted to Database This grants default privileges on schema objects created by Role in Database to Target.

RoleMember adds Member to the Target role.

SchemaPrivilege grants to Role on Database CREATE|USAGE on public schema CREATE|CONNECT|TEMPORARY on database.