> 
> I'd recommend continuing down the path you are exploring which is having
> test data and tweaking/tuning/correcting your queries until they are
> acceptable.
> 
> You'll probably find it easier to write the processing algorithm in the
> programming language of your choice.  This will allow you to print out
> diagnostics as you go along, play with a debugger etc.  To make it easy
> to map back to SQL you should structure it as a for loop over the rows
> of data with inclusion/exclusion conditions at the top of the loop.  If
> you decide to express it in SQL again you can then run your correct
> language code against SQL and compare the results as your test
> framework.  (Strictly speaking you are already doing this but the
> programming language is your brain :-)
> 


Thank you for the advice....   Can you point me to some examples of code in a 
traditional language and the equivalent in SQL?



      

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