Re: EPOCH TIMESTAMP Conversion Problem

On Jan 1, 2008, at 9:28 , Louis-David Mitterrand wrote:

> On Wed, Nov 07, 2007 at 10:35:08AM -0500, Tom Lane wrote:
>> "Amitanand Chikorde" <amit99rs@gmail.com> writes:
>>> I want to convert MAX(mydate) from myTable to Epoch.
>>
>> Do you mean
>>     SELECT EXTRACT(EPOCH FROM MAX(mydate)) FROM myTable
>
> Is using casts for the same purpose deprecated?
>
>     SELECT current_date::timestamp::abstime::int4;

EXTRACT is SQL-standard syntax which appeals to some people. The ::  
casting syntax is a Postgres extension. And from the docs:

http://www.postgresql.org/docs/8.2/static/datatype-datetime.html

>  The types abstime  and reltime are lower precision types which are  
> used internally. You are discouraged from using these types in new  
> applications and are encouraged to move any old ones over when  
> appropriate. Any or all of these internal types might disappear in  
> a future release.


Michael Glaesemann
grzm seespotcode net