What are the names of workshop groups in which services with product name "film" are performed?
CREATE TABLE Services (Workshop_Group_ID VARCHAR, Product_Name VARCHAR); CREATE TABLE Drama_Workshop_Groups (Store_Phone VARCHAR, Store_Email_Address VARCHAR, Workshop_Group_ID VARCHAR)
[SQL] SELECT T1.Store_Phone, T1.Store_Email_Address FROM Drama_Workshop_Groups AS T1 JOIN Services AS T2 ON T1.Workshop_Group_ID = T2.Workshop_Group_ID WHERE T2.Product_Name = "film" [/SQL]