Need help designing a proper sql query

I have this table:

DebitDate | DebitTypeID | DebitPrice | DebitQuantity
----------------------------------------------------
40577       1             50           3
40577       1             100          1
40577       2             75           2
40578       1             50           2
40578       2             150          2

I would like to get with a single query (if that's possible), these details: date, debit_id, total_sum_of_same_debit, how_many_debits_per_day

so from the example above i would get:

40577, 1, (50*3)+(100*1), 2 (because 40577 has 1 and 2 so total of 2 debits per this day)
40577, 2, (75*2), 2 (because 40577 has 1 and 2 so total of 2 debits per this day)
40578, 1, (50*2), 2 (because 40578 has 1 and 2 so total of 2 debits per this day)
40578, 2, (150*2), 2 (because 40578 has 1 and 2 so total of 2 debits per this day)

So i have this sql query:

SELECT      DebitDate, DebitTypeID, SUM(DebitPrice*DebitQuantity) AS TotalSum
FROM        DebitsList
GROUP BY    DebitDate, DebitTypeID, DebitPrice, DebitQuantity

And now i'm having trouble and i'm not sure where 开发者_运维知识库to put the count for the last info i need.

You would need a correlated subquery to get this new column. You also need to drop DebitPrice and DebitQuantity from the GROUP BY clause for it to work.

SELECT   DebitDate,
         DebitTypeID,
         SUM(DebitPrice*DebitQuantity) AS TotalSum,
         (   select Count(distinct E.DebitTypeID)
             from DebitsList E
             where E.DebitDate=D.DebitDate) as CountDebits
FROM     DebitsList D
GROUP BY DebitDate, DebitTypeID

I think this can help you.

SELECT      DebitDate,  SUM(DebitPrice*DebitQuantity) AS TotalSum, Count(DebitDate) as DebitDateCount
FROM        DebitsList where DebitTypeID = 1
GROUP BY    DebitDate