gistfile1.txt

table:
user,balance,deposits,date
1,100,200,4/22
1,50,0,4/23
1,100,0,4/24
2,0,0,4/22
2,50,0,4/23
2,100,0,4/24
==============================================
SELECT user,
       SUM(deposits) as total_deposits, 
       end_balance - start_balance - total_deposits as total_profit
FROM table t
LIMIT 1

===============================================
End goal - 
Given a date range, return a users total deposits, and the top 1 user who make the biggest profit.  

In this case, assuming date range 4/22-4/24, we'd want the following result:

2,0,100