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Message-ID: <bf05e51c0612180936w11bd270an8d845cf4621a9d65@mail.gmail.com>
Date: Mon, 18 Dec 2006 11:36:07 -0600
From: "Aaron Bono" <postgresql@aranya.com>
To: "Carlos Santos" <carlos@compels.net>
Subject: Re: SELECT with WHERE clause by column number
Cc: "Lista PostgreSQL SQL" <pgsql-sql@postgresql.org>
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On 12/18/06, Carlos Santos <carloscompels@yahoo.com.br> wrote:
>
> Hi!
>
> I need to make a query like this:
>
> SELECT id FROM myTable WHERE column-number = 'value';
> (PS: The id column is the primary key of myTable).
>
> That is a select using column number in the WHERE clause what don't exists
> in SQL.
>
> I need this because there's a situation in my program where I don't have
> the column name.
> I've solved that querying Postgresql the name of the column with that
> number, and then creating  the SELECT query.
> But this solution is slow... two database calls...
>
> Can I do this with a single query or in a faster way through SQL, an
> internal function or through a Procedural Language?
>

Can you provide the 2 queries you used to successfully do this in two
database calls?

I am not sure that select makes sense.  Where clauses work on rows, not
columns.  Having your two working queries will help us see what you are
really trying to do.

-- 
==================================================================
   Aaron Bono
   Aranya Software Technologies, Inc.
   http://www.aranya.com
   http://codeelixir.com
==================================================================

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On 12/18/06, <b class="gmail_sendername">Carlos Santos</b> &lt;<a href="mailto:carloscompels@yahoo.com.br">carloscompels@yahoo.com.br</a>&gt; wrote:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">
Hi!<br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="arial" size="1"><font size="2"><br>I need to make a query like this:<br><br>SELECT id FROM myTable WHERE column-number = 'value';
<br></font></font><font face="arial" size="1"><font size="2">(PS: The <span style="font-style: italic;">id</span> column is the primary key of <span style="font-style: italic;">myTable</span>).<br><br></font></font><font face="arial" size="1">
<font size="2">That is a select using column number in the WHERE clause what don't exists in SQL.<br><br>I need this because there's a situation in my program where I don't have the column
 name.<br>I've solved that querying Postgresql the name of the column with that number, and then creating&nbsp; the SELECT query.<br>But this solution is slow... two database calls...<br><br>Can I do this with a single query or in a faster way  through SQL, an internal function or through a Procedural Language?
</font></font></div></div></div></div><span class="ad"> 
</span></div><span class="ad">
</span></blockquote></div><br>Can you provide the 2 queries you used to successfully do this in two database calls?<br><br>I am not sure that select makes sense.&nbsp; Where clauses work on rows, not columns.&nbsp; Having your two working queries will help us see what you are really trying to do.
<br clear="all"><br>-- <br>==================================================================<br>&nbsp;&nbsp; Aaron Bono<br>&nbsp;&nbsp; Aranya Software Technologies, Inc.<br>&nbsp;&nbsp; <a href="http://www.aranya.com">http://www.aranya.com</a><br>&nbsp;&nbsp; 
<a href="http://codeelixir.com">http://codeelixir.com</a><br>==================================================================

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