Help! Can this be done in one statement?

Question

po_line_tbl
po_id(PK) line_nbr(PK) qty
001 1 250
001 2 100
po_line_distrib_tbl
po_id(PK) line_nbr(PK) distrib_nbr(PK) qty
001 1 1 75
001 1 2 75
001 1 3 75
001 2 1 100
There's a one to many relationship between the two tables. in the distrib table, for line_nbr:1, sched_nbr:3 the quantity needs to be changed to 100. The update needs to check the sum of the quantity on the distrib table line_nbr for any given po_id. So:
select line_nbr, sum(qty) from po_line_distrib where po_id = '001' group_by line_nbr
1 225
2 100
If that quantity doesn't equal the quantity in the line table for that given line. the max distrib_line needs to be updated with the difference in the quantity.
So line_nbr:1, distrib_nbr_3 would need to be changed to 100.
Thanks all!!

Answer 1

Hi!
You can try this:
update po_line_distrib_tbl A
set A.qty = A.qty + (select (select D.qty
                             from  po_line_tbl D
                             where D.po_id = A.po_id
                             and   D.line_nbr = A.line_nbr) -
                         (select sum(C.qty)
                             from  po_line_distrib_tbl C
                             where A.po_id = C.po_id
                             and   A.line_nbr = C.line_nbr)
               from dual)
where A.distrib_nbr = (select max(B.distrib_nbr)
                       from PO_LINE_DISTRIB_TBL B
                       where A.po_id = B.po_id
                       and  A.line_nbr = B.line_nbr)Thanks,
Rico