Hello,
you can sum only interval type
create type x (a inteval);
testdb011=> insert into x values ('1 day'::interval);
INSERT 18871 1
testdb011=> insert into x values ('1 day'::interval);
INSERT 18872 1
testdb011=> insert into x values ('1 day'::interval);
INSERT 18873 1
testdb011=> insert into x values ('1 day'::interval);
INSERT 18874 1
testdb011=> insert into x values ('1 day'::interval);
INSERT 18875 1
testdb011=> insert into x values ('1 day'::interval);
testdb011=> select sum(i) from x;
sum
--------
6 days
regards
Pavel Stehule
On Fri, 5 Mar 2004, arief# wrote:
> Dear all,
>
>
> I'm sorry if this sounds stupid or have been talked about before.
>
> Suppose I have a field in my table that's called duration with type
> 'time without timezone'. How do I do sum on this field based on another
> field let say called dateofevent?
>
> SQL: SELECT SUM(duration) FROM durtable GROUP BY dateofevent;
>
> gives me:
>
> ERROR: Unable to select an aggregate function sum(time without time
> zone)
>
> Is this because of me still using PostgreSQL version 7.2.1 from Debian
> Woody? Or some other stupidity?
>
>
> TIA, Regards.
> -arief
>
>
>
>
>
>
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