Message-ID: <42CEB325.90906@cs.concordia.ca>
Date: Fri, 08 Jul 2005 13:08:53 -0400
From: Ying Lu <ying_lu@cs.concordia.ca>
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To: Michael Fuhr <mike@fuhr.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: Index creation question for expression (col1 || '-' ||
References: <42CEA509.3090507@cs.concordia.ca>
	<20050708163215.GA81846@winnie.fuhr.org>
In-Reply-To: <20050708163215.GA81846@winnie.fuhr.org>
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>On Fri, Jul 08, 2005 at 12:08:41PM -0400, Ying Lu wrote:
>  
>
>>CREATE INDEX idx_t1 ON test (col1 || '-' || col2);
>>
>>May I know is it possible and how I may create index for the expression 
>>such as "col1 || '-' || col2" for a table please?
>>    
>>
>
>
>"The syntax of the CREATE INDEX command normally requires writing
>parentheses around index expressions, as shown in the second
>example...."
>
>That second example is exactly what you're trying to do:
>
>CREATE INDEX people_names ON people ((first_name || ' ' || last_name));
>  
>

This is exactly what I want. I missed a pair of "()" :( . That is why I 
got an error.

Thank you very much.

- Emi