Correlated subquery/update
Hi all-
I'm trying to match up two tables based on a primary key, and then copy
(update) a field in the second table to match a field in the first. Hard to
explain well... so here's an example:
select * from one;
a | b
---------
1 | null
2 | null
select * from two;
c | d
---------
1 | one
2 | two
In essence, I want to match up the records where one.a=two.c and update
one.b with the value in two.d . In Oracle, I would use this statement:
update one set b = (select d from two where one.a = two.c);
in psql, I get a syntax error when I do this. Either a correlated
subquery/update is not supported, or (more likely) I'm using the wrong
approach. Can anyone tell me whether this is supported, or how I can get the
job done using a different approach?
Thanks!
-Nick
---------------------------------------------------------------------
Nick Fankhauser
Business:
nickf@ontko.com Phone 1.765.935.4283 Fax 1.765.962.9788
Ray Ontko & Co. Software Consulting Services http://www.ontko.com/
Personal:
nickf@fankhausers.com http://www.fankhausers.com
"Nick Fankhauser" <nickf@ontko.com> writes:
In essence, I want to match up the records where one.a=two.c and update
one.b with the value in two.d . In Oracle, I would use this statement:
update one set b = (select d from two where one.a = two.c);
in psql, I get a syntax error when I do this.
play=> create table one (a int, b text);
CREATE
play=> create table two (c int, d text);
CREATE
play=> update one set b = (select d from two where one.a = two.c);
UPDATE 0
Looks OK to me (at least in 7.0.* and 7.1). What release are you using?
regards, tom lane