Question

can anyone help me out with one query?
i have a DB that looks like this:
table expenses

paydate       receiver   payment
2011-05-06     SOLO       3000
2011-05-08     Walmart    5000
2011-05-09     McDonalds  400
2011-05-08     Korona     700
2011-05-08     Walmart    1000
2011-05-09     BigZ       1300

I have to calculate the sum of all payments in the day when the max payment was done.
the result should look like this:

paydate       payment
2011-05-08    6700

i managed to find the max payment and the paydate of it:

SELECT payment, paydate FROM expenses WHERE payment=(SELECT max(payment) FROM expenses);

but it only gives me the max payment and paydate, and i need a sum of the payments on that day.

Answer 1

CREATE TABLE `t` (
`t1` INT(10) NULL DEFAULT NULL,
`t2` DATE NULL DEFAULT NULL,
`t3` INT(10) NULL DEFAULT NULL
)


INSERT INTO `t` (`t1`, `t2`, `t3`) VALUES
(1, '2012-04-19', 100),
(2, '2012-04-18', 200),
(3, '2012-04-18', 300),
(4, '2012-04-19', 150);

and query:

select sum(t3), t2 from t  where t2=(select t2 from t where t3 = (select max(t3) from t))

result gives us 500 and 2012-04-18, i.e. sum and date

or check this:

select t1, sum(t3), t2 from t  where t2=(select t2 from t where t3 = (select max(t3) from t)) group by t1