CODEWITHSUNDEEP
sqloracle-database
PeteG
PeteG

Reputation: 33

Oracle 10 how to update a table as a sum

I have two tables with identical columns ID, A, B, C.

I need to ADD to TableX the values from TableY for the corresponding ID's. I know how to do this for a SINGLE update as follows:

update TableX x
set x.A= x.A +
    (select y.A
    from TableY y
    where x.id= y.id)
where exists (select y.id
    from TableY y
    where x.id = Y.id).

But how to modify this statement so that I can update multiple columns as sums?

TIA

Upvotes: 3

Views: 259

Answers (3)

Sudhanshu Agrawal
Sudhanshu Agrawal

Reputation: 432

We can do this the following way in Teradata:

Update X
From TableX X,
(Select A,B,C From TableY Where id in (select id from TableX group by 1)) S
set
A=A+S.A
,B=B+S.B
,C=C+S.C
where exists (select y.id
from TableY y
where x.id = Y.id)

Upvotes: 0

Ponder Stibbons
Ponder Stibbons

Reputation: 14848

merge into tableX x
using (select * from tableY) y
on (x.id = y.id)
when matched then update set
  x.a = x.a + y.a, x.b = x.b + y.b, x.c = x.c + y.c;

SQLFiddle

You could use merge, especially if you want also insert non existing rows.

Upvotes: 1

sstan
sstan

Reputation: 36493

update TableX x
set (x.A, x.B, x.C) = (select y.A + x.A,
                              y.B + x.B,
                              y.C + x.C
                       from TableY y 
                       where x.id= y.id)
where exists (
  select y.id 
  from TableY y 
  where x.id = Y.id)

Upvotes: 2

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