Database: headphone_store
Question: Find the name of the store which has the most headphones in stock. List the number of headphones as well.
SQL:
SELECT t1.name ,  sum(t2.quantity) FROM store AS t1 JOIN stock AS t2 ON t1.store_id  =  t2.store_id GROUP BY t2.store_id ORDER BY sum(t2.quantity) DESC LIMIT 1