From: Daniel Henrique Alves Lima <email_daniel_h@yahoo.com.br>
To: pgsql-sql@postgresql.org
Subject: Re: Simple SQL question
Date: Tue, 09 Mar 2004 01:21:59 -0300
Message-ID: <404D4667.10206@yahoo.com.br> (raw)
In-Reply-To: <20040308184440.GG588@64.81.242.180>
References: <404C7EE3.8010006@yahoo.com.br>
<20040308184440.GG588@64.81.242.180>
Thank you, Jeremy.
I've built a function that returns a string from (cd_teacher, cd_course)
and i've create a functional index over this function, like :
create index teacher_course_idx on teacher_course
(build_unique_2p(cd_teacher,cd_course));
select * from teacher_course where build_unique_2p(cd_teacher,cd_course)
in ('1:2','23:11','563','341');
Is it possible to use "array cast" over cd_teacher and cd_course (just
an idea, i don't known the sintaxe), like:
select * from teachar_course where cast((cd_teacher,cd_course) as array)
in ('{1,2}','{23,11}','{563,341}');
?
I'm using postgreSQL 7.34
Thanks !!!
Jeremy Semeiks wrote:
>You could use a subselect of unions:
>
>select * from teacher_course where (cd_course, cd_teacher) in
>(select 1, 2 union select 23, 11 union select 563, 341)
>
>Maybe there's a more concise way, though.
>
>- Jeremy
>
>
>
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