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 T-SQL UPDATE JOIN Two Tables
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lesponce
Starting Member

8 Posts

Posted - 12/06/2012 :  19:57:02  Show Profile  Reply with Quote
I need to update a field with value '1' on Table A, but I need to join to Table B to check if the customer that I'm going to update on table A, exists on Table B. If the customer does not exist on table B, then I can't update Table A.

How do I do that?

On Table A I'm going to set FLAG = '1'
WHERE FLAG on TABLE A is NULL and Does exists on TABLE B

jimf
Flowing Fount of Yak Knowledge

USA
2869 Posts

Posted - 12/06/2012 :  20:22:38  Show Profile  Reply with Quote
UPDATE a
SET FLAG = '1'
FROM tableA a
WHERE EXISTS
(select * from tableB b where a.customer = b.customer)
AND FLAG is null

Jim

Jim

Everyday I learn something that somebody else already knew
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