https://learn.microsoft.com/en-us/sql/relational-databases/system-stored-procedures/sp-dbfixedrolepermission-transact-sql?view=sql-server-2017
sp_dbfixedrolepermission (Transact-SQL) - SQL Server | Microsoft Learn
sp_dbfixedrolepermission displays the permissions of a fixed database role.
sql serversptransactmicrosoftlearn