From: Michael Meskes <Michael_Meskes@topmail.de>
To: Margarita Barvinok <brita@math.lsa.umich.edu>
Cc: PostgreSQL Interfaces <pgsql-interfaces@postgresql.org>
Subject: Re: [INTERFACES]- SELECT statement
Date: Thu, 25 Feb 1999 19:44:26 +0100
Message-ID: <19990225194426.B1476@gmx.net> (raw)
In-Reply-To: <Pine.SOL.3.96-4hack.990224134002.12574D-100000@sewerurchin.math.lsa.umich.edu>
References: <Pine.SOL.3.96-4hack.990224134002.12574D-100000@sewerurchin.math.lsa.umich.edu>
On Thu, Feb 25, 1999 at 09:26:50AM -0500, Margarita Barvinok wrote:
> 1)
> How can I realize this query in C-Embedded SQL?
>
> SELECT MAX (score)
> FROM report
> WHERE uname = 'xxxxxxx'
> AND exam_id IN
> ( SELECT exam_id
> FROM exam
> WHERE name = 'yyyy'
> )
exec sql declare C cursor for SELECT MAX (score)
FROM report
WHERE uname = 'xxxxxxx'
AND exam_id IN
( SELECT exam_id
FROM exam
WHERE name = 'yyyy'
);
exec sql fetch in C into :score;
> I used DECLARE CURSOR and FETCH for second SELECT statement.
> But I don't know how to use WHERE ... IN clause.
This is one statement. The subselect is handled by the backend.
Michael
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To: pgsql-interfaces@postgresql.org
Cc: Michael_Meskes@topmail.de, brita@math.lsa.umich.edu
Subject: Re: [INTERFACES]- SELECT statement
In-Reply-To: <19990225194426.B1476@gmx.net>
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