sql - Subtract two columns -


i have following ms access table:

itemid   qty  flag 1         2    0 1         1    1  2         5    0 2         4    1

i want write query balance (qty-qty) , group flag.

as example:

(sum of qty flag =0) - (sum of qty flag =1)

my final output should be:

1=1  2=1

use conditional aggregation:

select itemid,        nz(sum(iif(flag = 0, qty, 0)), 0) - nz(sum(iif(flag = 1, qty, 0)), 0) difference yourtable group itemid

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