Question

update one table from values in another table

Asked by: ebi168

Hi,

I used this statement to update one column the 1st table from column value in a 2nd table:

update testb1
set col2=(select col2 from testb2 where testb2.col1=testb1.col1)

But this not only update all rows in testb1 where testb2.col1=testb1.col1, but those with testb2.col1!=testb1.col1 also get updated with value null.

If I put a where condition:
update testb1
set col2=(select col2 from testb2 where testb2.col1=testb1.col1)
where col1='test'

It will only accept literal value, I can't put another table's info there.

Can anyone tell me how do I update only a portion of the rows based on another table.

Thanks

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Asked On
2005-02-03 at 16:38:49ID21301273
Tags

another

,

update

,

from

,

one

,

values

Topic

Databases Miscellaneous

Participating Experts
5
Points
300
Comments
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by: jocasio123Posted on 2005-02-03 at 17:00:04ID: 13221297

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by: ebi168Posted on 2005-02-03 at 17:41:27ID: 13221521

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by: jocasio123Posted on 2005-02-03 at 18:33:03ID: 13221750

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by: jocasio123Posted on 2005-02-03 at 18:37:19ID: 13221777

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by: sujit_kumarPosted on 2005-02-03 at 19:21:45ID: 13222013

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by: BigSchmuhPosted on 2005-02-04 at 01:51:16ID: 13223686

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by: jocasio123Posted on 2005-02-04 at 05:27:14ID: 13225084

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by: peterside7Posted on 2005-02-04 at 06:42:26ID: 13225878

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by: BigSchmuhPosted on 2005-02-04 at 06:45:45ID: 13225917

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by: ebi168Posted on 2005-02-04 at 09:51:30ID: 13228047

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by: peterside7Posted on 2005-02-04 at 16:36:55ID: 13231356

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