Captain Jack wrote:
> Which hikes up my filtering costs later...

Which is why actual production SQL operates with outer joins instead of the 
formal mathematical operations. :-)

Note that relational theory also says rows are unordered and cannot be 
duplicated, neither of which is true of a practical large-scale SQL server's 
data.

-- 
   Darren New, San Diego CA, USA (PST)
   I ordered stamps from Zazzle that read "Place Stamp Here".

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