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From: stig erikson <[email protected]>
To: [email protected]
Subject: Re: type casting reference? SOLVED
Date: Wed, 15 Jun 2005 21:03:18 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

stig erikson wrote:
> hi.
> i need to cast from timestamp to seconds (in the form of integer).
> 
> i have a table with a column:
> expiretime timestamp
> 
> i have tried the following, it gives errors as below:
> SELECT expiretime::float4 AS timeleft FROM table WHERE something='1234';
> ERROR:  cannot cast type timestamp without time zone to real
> 
> SELECT expiretime::text::float4 AS timeleft FROM table WHERE 
> something='1234';
> ERROR:  invalid input syntax for type real: "2005-06-12 21:21:24.368082"
> 
> 
> postgresql 7.4.1 (i know, old)
> 
> so, my question is simply, where in the docs can i find how i should 
> perform the cast?
> it would help a lot if there was a table showing which types can be 
> cased into which, and possibly an example or two for situations like 
> this, casting from timestamp (to timestamp worked right away).
> 
> /stig

solved my problem this way:

UPDATE table
SET expiretime= cast( ('now'::text)::timestamp+'30 minutes'::interval AS timestamp)
WHERE sessionID='0';

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