Re: [GENERAL] Any ideas why this doesn't work or how to rewrite it?

On Wed, 28 Apr 1999, Aaron Holtz wrote:
> This seems like a simple SQL command, but I'm getting errors.
> Running 6.5.0 under RedHat 5.2:
>
> db=> select count(distinct customer_username) from customerdata;
> ERROR: parser: parse error at or near "distinct"
>
> How do you get a count of distinct data output via postgres? I can always
> just count the number of tuples returned but this seemed to be a valid
> query.

In SQL, it is just pretty valid query. But Postgres does not implement
SELECT COUNT(DISTINCT).

Do instead
SELECT DISTINCT(customer_username) FROM customerdata;
and count it in your program.

> --------------------------------------------------------------------------
> Aaron Holtz
> ComNet Inc.
> UNIX Systems Specialist
> Email: aholtz(at)bright(dot)net
> "It's not broken, it just lacks duct tape."
> --------------------------------------------------------------------------

Oleg.
----
Oleg Broytmann http://members.xoom.com/phd2/ phd2(at)earthling(dot)net
Programmers don't die, they just GOSUB without RETURN.