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Update query [message #372620]

Wed, 28 February 2001 15:30

Dean
Messages: 34
Registered: August 2000

Member

I have two tables, a big and a small one. I want to write a query that updates a given field in the big table with one from the small table, but does not update the field if there is no match. Right now my query puts nulls in the big table if there is not a match.
This should be very easy to do. Any suggestions?

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Re: Update query [message #372624 is a reply to message #372620]

Wed, 28 February 2001 16:21

Andrew again...
Messages: 270
Registered: July 2000

Senior Member

update big b
set b.col1 = (select a.col1 from small a
where a.joincol = b.joincol)
where b.joincol in (select c.joincol from small c);

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Re: Update query [message #372625 is a reply to message #372620]

Wed, 28 February 2001 16:22

Joachim Lindner
Messages: 30
Registered: February 2001

Member

I'm not sure if I got you right, but this should help you ...

update big
set col = (
select col
from small
where small.pk = big.pk
);

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Re: Update query [message #372628 is a reply to message #372620]

Thu, 01 March 2001 03:51

Joachim Lindner
Messages: 30
Registered: February 2001

Member

Sorry ... just checked my proposal and understand your problem now. Andrew's proposal does the job.

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