Database: warehouse_1
Question: Find the location of the warehouses which store contents Rocks and Scissors.
SQL:
SELECT T2.location FROM boxes AS T1 JOIN warehouses AS T2 ON T1.warehouse  =  T2.code WHERE T1.contents  =  'Rocks' INTERSECT SELECT T2.location FROM boxes AS T1 JOIN warehouses AS T2 ON T1.warehouse  =  T2.code WHERE T1.contents  =  'Scissors'