Re: querying a column w/ timestamp with timezone datatype

On 01/30/2012 07:00 AM, Anson Abraham wrote:
> I an 9.1 PG database: I have a column which is a timestamp w/ time 
> zone.  So the value I have as one record in table is: 15:55:24.342848+00
>
> If i want to find records less or greater than that timestamp, how do 
> I construct the query?
>
> select * from schema.table where tscol >= '15:55:24.342848+00';
> select * from schema.table where tscol >= '15:55:24.342848+00'::timestamp;
> select * from schema.table where tscol >= cast('15:55:24.342848+00' as 
> timestamp with time zone);
>
> do not work.  Do I have to convert the value to a string and substr to 
> 15:55:24 and then convert back to a timestamp? It's been a long while 
> since I had to query a pg table w/ a timestamp with time zone value. 
>  Any help here would be appreciated.

Those aren't timestamps - timestamps include the date part.

Perhaps you are thinking about a *time* with time zone (a type that 
exists due to SQL requirements but which is a somewhat nonsensical type, 
the use of which is not recommended):
http://www.postgresql.org/docs/9.1/static/datatype-datetime.html#DATATYPE-TIMEZONES

Cheers,
Steve