select extract and subqueries - Mailing list pgsql-general

From mike sears
Subject select extract and subqueries
Date
Msg-id 001001c17234$fcadf7d0$fa00000a@wyd2002.org
Whole thread Raw
List pgsql-general
I don't know if its possiable or not but I've been having problems trying to extract the timestamp out of one of my columns so that I can compare the dates.
 
if I do the following it gives me a proper epoch
en=# SELECT EXTRACT(EPOCH FROM TIMESTAMP '2001-11-20'); 
 date_part 
------------
 1006232400
(1 row)
 
but if I try to use a subquery to get the date it gives me a parse error.
 
en=# SELECT EXTRACT (EPOCH FROM TIMESTAMP (select date from master));
ERROR:  parser: parse error at or near "select"
 
is this simply just a limitation of the extract funtion or am I missing something?
 
Mike

pgsql-general by date:

Previous
From: Jason Earl
Date:
Subject: Re: migrating from MSSql
Next
From: Thomas Lockhart
Date:
Subject: Re: select extract and subqueries