what are the different names of the singers that have sales more than 300000?
SELECT DISTINCT T1.Name FROM singer AS T1 JOIN song AS T2 ON T1.Singer_ID  =  T2.Singer_ID WHERE T2.Sales  >  300000
SELECT DISTINCT T1.Name FROM singer AS T1 JOIN song AS T2 ON T1.Singer_ID  =  T2.Singer_ID WHERE T2.Sales  >  300000
[{'Name': 'Liliane Bettencourt'}, {'Name': 'Christy Walton'}, {'Name': 'Iris Fontbona'}]