Re: a celko-puzzle from long time ago

> While reading celko's SQL puzzles (second edition) i followed a reference to
> http://www.dbmsmag.com/9801d06.html.
> There is a puzzle that counts items in boxes.
> When i try to run the proposed solution on PG 8.1.5, PG says: ERROR:  column reference "qty" is
> ambiguous
> 
> 
> apparently the variable declaration used in the solution is not proper for PostgreSQL. Is there
> a way to solve this puzzle in PostgreSQL?

I believe that qty is a parameter variable that must first be set in psql.  I've seen some thread
in various lists that describe how to set parameter variables before executing a query that uses
them.

Regards,

Richard Broersma Jr.