Re: [SQL] subqueries

Поиск
Список
Период
Сортировка
От Walt Bigelow
Тема Re: [SQL] subqueries
Дата
Msg-id Pine.LNX.3.96.990413130102.30435A-100000@alice.stimpy.com
обсуждение исходный текст
Ответ на Re: [SQL] subqueries  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: [SQL] subqueries  (Tom Lane <tgl@sss.pgh.pa.us>)
Список pgsql-sql

On Tue, 13 Apr 1999, Tom Lane wrote:

> Walt Bigelow <walt@stimpy.com> writes:
> > SELECT agencyid, first, last 
> > FROM tbladdress
> > WHERE type = 1
> > AND agencyid NOT IN
> >     (SELECT distinct agencylink
> >     FROM tbladdress 
> >     WHERE type = 2)
> > ORDER BY last;
> 
> Looks reasonable ...
> 
> > This query returns 0 rows [ when it shouldn't ].
> 
> Sounds like a bug.  What version of Postgres are you running?
> What do you get from "EXPLAIN"ing that query?  What are the
> data types of the columns being used?
> 

Tom,

I am using postgres 6.4.2 on a RH5.1 SMP box.

The output of explain:
NOTICE: QUERY PLAN:

Seq Scan on tbladdress  (cost=50.34 size=348 width=24) SubPlan   ->  Unique  (cost=50.34 size=0 width=0)         ->
Sort (cost=50.34 size=0 width=0)              ->  Seq Scan on tbladdress  (cost=50.34 size=348 width=4)
 

EXPLAIN

The data types are int4 for both agencyid and agencylink.  And there are
about 800 rows total of 5 different types.  (the type field is int4 as
well)

Thanks again,
Walt




В списке pgsql-sql по дате отправления:

Предыдущее
От: David Sauer
Дата:
Сообщение: bug report on text text fields. WAS: Re: [SQL] Trouble with ...
Следующее
От: Tom Lane
Дата:
Сообщение: Re: [SQL] subqueries