Project 3 Operations and Metrics Analysis

I think the SQL Learning material is not sufficient on Trainity learning dashboard and no masterclass recordings are there for SQL. I have completed Project 2 with the help of learning material provided but in I got stucked in Project 3 and realize I am not adequately equipped with advance sql skill required. So please let me know if there are any more videos upcoming on sql and if not do share some sources which I can peruse or a way to help.