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Re: [INTERFACES]- SELECT statement

From: Michael Meskes <Michael_Meskes(at)topmail(dot)de>
To: Margarita Barvinok <brita(at)math(dot)lsa(dot)umich(dot)edu>
Cc: PostgreSQL Interfaces <pgsql-interfaces(at)postgresql(dot)org>
Subject: Re: [INTERFACES]- SELECT statement
Date: 1999-02-25 18:44:26
Message-ID: 19990225194426.B1476@gmx.net (view raw or flat)
Thread:
Lists: pgsql-interfaces
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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