CREATE TABLE stock (Shop_ID VARCHAR, quantity INT)
CREATE TABLE shop (Shop_Name VARCHAR, Shop_ID VARCHAR)

Show the name of the shop that have the largest quantity of devices in stock.
SELECT T2.Shop_Name FROM stock AS T1 JOIN shop AS T2 ON T1.Shop_ID = T2.Shop_ID GROUP BY T1.Shop_ID ORDER BY SUM(T1.quantity) DESC LIMIT 1
SELECT "T2"."Shop_Name" FROM "stock" AS "T1" JOIN "shop" AS "T2" ON "T1"."Shop_ID" = "T2"."Shop_ID" GROUP BY "T1"."Shop_ID" ORDER BY SUM("T1"."quantity") DESC NULLS LAST LIMIT 1