Need help in updating table based on the values from another table using ORACLE SQL -

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table (id,amt), table b (id, qty)

i need multiply a.amt b.qty , update values on table a. id cols equal in , b. query have created:

update set a.amt =     (select a.amt * b.qty              b join                     on                  a.id=b.id)            exists           (select a.amt * b.qty                b join                     on                 a.id=b.id)

on execution returns error: single-row subquery returns more 1 row.

could me out on this.

for starters, re-using same table names without aliases on , on again hard through. may causing confusion. i'll try break down. start existing statement:

update set a.amt =   (select a.amt * b.qty                  b                      join on a.id=b.id)

you setting a.amount = calculation on every matching a/b pair because not ensuring query related id of row updating! error coming from. instead:

update a1 set a1.amt =   (select a2.amt * b.qty tot_amt                   b                      join a2 on a2.id=b.id                       a2.id = a1.id) -- link id of row updating!

ok, , can add in check matching b row update, in case can avoid rejoining unneccessary , use record working on

update a1 set a1.amt =   (select a2.amt * b.qty tot_amt                   b                      join a2 on a2.id=b.id                       a2.id = a1.id)  exists       (select 1             b b2            b2.id=a1.id)

i have wonder if there isn't more need though far null checking or 0 checking work way want requirements.


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