CREATE TABLE Drama_Workshop_Groups (Store_Phone VARCHAR2, Store_Email_Address VARCHAR2, Workshop_Group_ID VARCHAR2)
CREATE TABLE Services (Workshop_Group_ID VARCHAR2)

What are the phones and emails of workshop groups in which services are performed?
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
SELECT "T1"."Store_Phone", "T1"."Store_Email_Address" FROM "Drama_Workshop_Groups" "T1" JOIN "Services" "T2" ON "T1"."Workshop_Group_ID" = "T2"."Workshop_Group_ID"