Ð ÐÐÐ, 04.10.2004, Ð 16:17, Tom Lane ÐÐÑÐÑ:
> Markus Bertheau <[EMAIL PROTECTED]> writes:
> > I lately wondered if there is a difference between a JOIN and a IN in
> > queries similar to the following:
>
> > SELECT f1 FROM t1 JOIN t2 ON (t.f2 = t2.f2) WHERE t2.f3 = x
>
> > SELECT f1 FROM t1 WHERE
Markus Bertheau <[EMAIL PROTECTED]> writes:
> I lately wondered if there is a difference between a JOIN and a IN in
> queries similar to the following:
> SELECT f1 FROM t1 JOIN t2 ON (t.f2 = t2.f2) WHERE t2.f3 = x
> SELECT f1 FROM t1 WHERE t1.f2 IN (SELECT f2 FROM t2 WHERE f3 = x)
> As I see it
Hi,
I lately wondered if there is a difference between a JOIN and a IN in
queries similar to the following:
SELECT f1 FROM t1 JOIN t2 ON (t.f2 = t2.f2) WHERE t2.f3 = x
SELECT f1 FROM t1 WHERE t1.f2 IN (SELECT f2 FROM t2 WHERE f3 = x)
As I see it there's no semantic difference between the two. A
