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Update from a select statement

Posted on 2009-04-17
Medium Priority
Last Modified: 2013-11-05
I don't know why but this always trips me up.  I need to update tableA using the data from tableB.  How do I do that?
update tableA set field1 = 
	(select a.field2
	from tableA a, tableB b
	where b.field5 = a.field2
	and b.field3 = 13)

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Question by:scross1276
LVL 41

Accepted Solution

ralmada earned 2000 total points
ID: 24169080
Give this a try:
update tableA 
set field1 = a.field2
from tableA a, tableb b
where b.field5 = a.field2
and b.field3 = 13

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Author Comment

ID: 24169211
Ugh, so simple!  Thanks, it worked great!!
LVL 27

Expert Comment

by:Chris Luttrell
ID: 24169260
ralmada's should work, this is just in ANSI standard SQL with the JOIN.  I like this syntax better because it clearly defines the join conditions from the filter conditions in the WHERE clause.
update tableA 
set field1 = a.field2
from tableA a JOIN tableb b ON b.field5 = a.field2
where b.field3 = 13

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