How to fetch data from same column using different criteria?

Question

Hi I have table like this in SQL anywhere database

CUSTID-------DDAT.----------AMOUNT
1.         01-01-2021.       1000
1.         02-02-2021.       2000
1.         03-02-2021.       3000
1.         04-02-2021.       4000
2.         01-04-2021.        1000
2.         02-04-2021.         2000

2.  04-04-2021. 1000

I want data like this in VB.net where amount is only for one date and total amount is for 4 day

Cust id.------date ---------------Amount.-------Total amount
1.             04-04-2021.          4000.                 10000
 2.             04-04-2021.          1000.                 4000

Can you give me any solution..thanks in advance

Answer 1

My take on it:

select custid, dat, amount, total_amount
from (
    select custid, dat, amount, sum(amount) over (partition by custid) as total_amount
    from data
) d
where dat = '2021-04-04' -- or any other date

Might be that the inner select is all that you need. Not sure if the filter on date is necessary.