sum of customer transactions
1   Deal Certificate    int(3)
2   Purchase Price  decimal(4,2)
3   Purchase Date   timestamp
4   Serial Number   varchar(9)
5   Name    varchar(23)
6   Email   varchar(42)

SELECT *
   FROM `PURCHASES`
  WHERE `Purchase Date`
between '2012-01-01' and '2012-01-31'
  order by email

345     36.00   2012-01-17 16:42:33     7757-3097   T T     xxx@gmail.com
327     6.00    2012-01-05 10:40:57     0223-3945   R T     yyy@gmail.com
329     12.00   2012-01-02 04:54:45     1087-7072   P B     zzz@msn.com
294     7.00    2012-01-02 04:59:11     4144-2426   P B     zzz@msn.com
285     6.00    2012-01-02 05:12:39     8027-1641   P B     zzz@msn.com
1079    21.00   2012-01-02 05:05:07     2447-7971   P B     zzz@msn.com
331     10.00   2012-01-02 19:14:38     3916-5434   y a     aaa@aol.com

345     36.00   2012-01-17 16:42:33     7757-3097   T T     xxx@gmail.com
327     6.00    2012-01-05 10:40:57     0223-3945   R T     yyy@gmail.com
329     46.00   2012-01-02 04:54:45     1087-7072   P B     zzz@msn.com
331     10.00   2012-01-02 19:14:38     3916-5434   y a     aaa@aol.com

36.00   T T     xxx@gmail.com
6.00    R T     yyy@gmail.com
46.00   P B     zzz@msn.com
10.00   y a     aaa@aol.com

select sum(`Purchase Price`) as total_sum, name, email from purchases
where `Purchase Date` between '2012-01-01' and '2012-01-31'
group by email, name
order by email

SELECT  `Deal Certificate`,
        sum(`Purchase Price`) as sum_price
        `Purchase Date`,
        `Serial Number`,
        Name,
        Email
FROM PURCHASES
WHERE Purchase Date between '2012-01-01' and '2012-01-31'
group by `Deal Certificate`
order by email