From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | David Gauthier <davegauthierpg(at)gmail(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: nested query problem |
Date: | 2018-09-06 21:11:37 |
Message-ID: | 19947.1536268297@sss.pgh.pa.us |
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Lists: | pgsql-general |
David Gauthier <davegauthierpg(at)gmail(dot)com> writes:
> I'm having trouble with this query...
> select sr.sqf_id, sr.status, fse.perl_sub_name, fse.end_datetime
> from
> sqf_runs sr,
> (select perl_sub_name, end_datetime from flow_step_events_view where
> sqf_id = sr.sqf_id order by 2 limit 1) fse
> where sr.userid='foo';
> ERROR: invalid reference to FROM-clause entry for table "sr"
> LINE 4: ...atetime from flow_step_events_view where sqf_id = sr.sqf_id ...
> ^
> HINT: There is an entry for table "sr", but it cannot be referenced from
> this part of the query.
If you actually meant to access the outer "sqf_runs" RTE from the
sub-query, you need to mark it LATERAL:
select sr.sqf_id, sr.status, fse.perl_sub_name, fse.end_datetime
from
sqf_runs sr,
lateral (select perl_sub_name, end_datetime from flow_step_events_view where
sqf_id = sr.sqf_id order by 2 limit 1) fse
where sr.userid='foo';
regards, tom lane
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