Database: phone_market
Question: Show the names of phones that are on market with number of shops greater than 50.
SQL:
SELECT T3.Name FROM phone_market AS T1 JOIN market AS T2 ON T1.Market_ID  =  T2.Market_ID JOIN phone AS T3 ON T1.Phone_ID  =  T3.Phone_ID WHERE T2.Num_of_shops  >  50