SELECT T2.Carrier FROM stock AS T1 JOIN device AS T2 ON T1.Device_ID  =  T2.Device_ID GROUP BY T1.Device_ID HAVING COUNT(*)  >  1
What are the carriers of devices that are in stock in more than a single shop?
SELECT T2.Carrier FROM stock AS T1 JOIN device AS T2 ON T1.Device_ID = T2.Device_ID GROUP BY T1.Device_ID HAVING COUNT ( * ) > 1
select t2 . carrier from stock as t1 join device as t2 on t1 . device_id = t2 . device_id group by t1 . device_id having count ( * ) > value
What are the carriers of devices that are in stock in more than a single shop ?