sql - Aggregate function not giving sum -

i have query:

select o.idorder,     sum(case              when cast(isnull(ama.freeshiping, 0) int) = 0                 - 1000             else cast(isnull(ama.freeshiping, 0) int)             end) freeshiping orderdetail od,     amazonsku ama,     orders o,     tempprintrecords tmp o.idorder = od.idorder     , o.idcustomer = ama.idcustomer     , od.sku = ama.sku     --and od.idorder=350184     , od.idorder = tmp.idorder     , ama.freeshiping != 0 group o.idorder 

result:

here have 0 , null in ama.freeshiping

basically column bit , contains 0 , 1. if 0 found make -1000 identify idorder having 0 or null freeshipping

but it's not giving proper sum, should give result in -ve each column.

this expression in where clause:

and ama.freeshiping != 0 

only chooses values "1". remove if want see other values.

you should learn use proper join syntax. if used join keyword, of conditions in on clauses, , where condition might have been easier spot.