On Aug 12, 2006, at 10:55 AM, Anthony Garcia wrote:

> Good morning,
>
> I'm a ruby on rails newby and trying to figure out how I can  
> execute a star
> schema query like this.
>
> select generators.Unit,
>        thedates.weekday_name,
>        hours.thehour,
>        sum(generatorfacts.revenue)
> from
>        generatorfacts,
>        generators,
>        thedates,
>        hours
> where
>  generatorfacts.hour_id = hours.id and
>  generatorfacts.thedate_id = thedates.id and
>  generatorfacts.generator_id = generators.id and
>  thedates.weekday_name = 'Monday'
> group by generators.Unit,thedates.weekday_name,hours.thehour
> having sum(generatorfacts.rtrevenue) > 0
>
> This is a standard data warehouse type, star schema query.
>
> I've been reading and trying things in script console but I'm  
> hoping someone
> out there can give me a head start.
> I'm as far using has_many :through, and belongs_to in my models.  
> I've also
> heard that someone named Ken Kunz is developing an acts_as_fact  
> plugin which
> may be just what I need. Can anybody walk me through how I would  
> approach
> this?
>
Well first, you want the ruby on rails mailing list. Secondly, you  
may just want to use ActiveRecord::Base#find_by_sql for this, since  
you already seem to know exactly what you want.

> Regards,
> Anthony
>
>
>