Question

Oracle Query Needed

Asked by: Ashok9

Its a simple question for you all except me

I have two table. A, B

In A I have following records

Column 1, Column 2, Column 3
2  ,     2    ,    5
7  ,    3     ,    6
2  ,     6     ,    9


Similarly I have Table B as follows

Column 1, Column 2, Column 3
2  ,     2    ,    4
7  ,    3     ,    6
2  ,     6     ,    2


So I need to run query. That will take column1 and column 2 as the key in both the tables. and I have to add column 3 of Table B from column 3 of Table A by using the same Key (Column 1 and 2).

So my final result will be.

Column 1, Column 2, Column 3
2  ,     2    ,    9
7  ,    3     ,    12
2  ,     6     ,    11

I need the query for this.

But I dont want to use Cursors or any procedures.
I need the single query to do this.
Also If you use merge is also ok.

Thanks for your help.

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Asked On
2009-11-03 at 05:52:45ID24866985
Tags

Oracle

,

SQL

Topics

Oracle 10.x

,

PL / SQL

Participating Experts
3
Points
500
Comments
10

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Answers

 

by: sdstuberPosted on 2009-11-03 at 05:56:26ID: 25728915

select a.col1, a.col2, a.col3 + b.col3
from a, b
where a.col1 = b.col1
and a.col2 = b.col2

 

by: AndytwPosted on 2009-11-03 at 05:57:19ID: 25728925

Try this:

SELECT a.column_1,
       a.column_2,
       a.column_3 + b.column_3 column_3
FROM   table_a a,
       table_b b
WHERE  a.column_1 = b.column_1
AND    a.column_2 = b.column_2
                                              
1:
2:
3:
4:
5:
6:
7:

Select allOpen in new window

 

by: Ashok9Posted on 2009-11-03 at 05:57:42ID: 25728929

Similary i have to update table A.

Can you tell me how?

 

by: Ashok9Posted on 2009-11-03 at 05:58:27ID: 25728939

Exactly I dont need select query. I need update query to update table A.

 

by: AndytwPosted on 2009-11-03 at 06:01:06ID: 25728969

Ok, to update try this:

UPDATE table_a a
SET    column_3 =
       (SELECT b.column_3 + a.column_3
        FROM   table_b b
        WHERE  b.column_1 = a.column_1
        AND    b.column_2 = a.column_2);

                                              
1:
2:
3:
4:
5:
6:

Select allOpen in new window

 

by: sdstuberPosted on 2009-11-03 at 06:01:11ID: 25728970

update a
set col3 = (select a.col3 + b.col3 from b where a.col1 = b.col1 and a.col2 = b.col2)

 

by: Ashok9Posted on 2009-11-03 at 06:05:43ID: 31649404

Excellent. Thanks for your prompt reply

 

by: sdstuberPosted on 2009-11-03 at 06:06:16ID: 25729008

glad we could help

 

by: shru_0409Posted on 2009-11-03 at 06:06:40ID: 25729010

update B
set b.column3 = (select nvl(b.column3,0) + nvl(a.column3,0) from a where a.column1 = b.column1 and a.column2 = b.column2)

 

by: Ashok9Posted on 2009-11-08 at 23:31:34ID: 25773957

Sorry for continuing.

The update query is updating all the records in the table. If there is no key combination found, then also it is updating the existing value to null.

Now I am using NVL function to retain the same values again.
But My table is huge about 2 crore. So its updating all the records.
It reduces the performance of the query.

So I need to update only matching records.

20120131-EE-VQP-002

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