What are the ids of all students and number of hours played?
SELECT Stuid ,  sum(hours_played) FROM Plays_games GROUP BY Stuid
SELECT Stuid ,  sum(hours_played) FROM Plays_games GROUP BY Stuid
[{'StuID': 1001, 'sum(hours_played)': 51}, {'StuID': 1007, 'sum(hours_played)': 1000}, {'StuID': 1008, 'sum(hours_played)': 100}, {'StuID': 1010, 'sum(hours_played)': 1337}, {'StuID': 1032, 'sum(hours_played)': 157}]