Question

I’m trying to set the date field for column date to let’s say ’10/11/2012′ in table 1 when the sum of all amounts table 2 related to that id (via fk_id) = 0. Here’s what I mean:

FROM:

table 1

    id    date
    1     10/11/2011
    2      
    3     10/12/2011

table 2

    fk_id    amount
    1     200
    2     0
    2     0
    3     100

TO:

table 1

    id    date
    1     10/11/2011
    2     10/11/2012
    3     10/12/2011

table 2

    fk_id    amount
    1     200
    2     0
    2     0
    3     100

This is what I have currently:

update table1
set date = '10/11/2012
FROM table1 inner join table 2 on table1.id = table2.fk_id
HAVING sum(table2.amount) = 0

Can someone help me out here?

Answer 1

UPDATE table1 
SET date = '10/11/2012' 
FROM table1 
WHERE id IN (SELECT FK_ID FROM table2 GROUP BY FK_ID HAVING SUM(Amount)=0)