Invisible wrote:
> As I understand it, this is considered one of the "seminal texts" on 
> relational databases. 

It was some 25 years ago too. :-)

> Even I cannot comprehend the relational calculus though. Relational 
> algebra, sure. But relational calculus? Nah.

Same here. I understand that SQL itself is much closer to the relational 
calculus than the relation algebra. I'd have to go back and try to read it 
again, tho.

-- 
   Darren New, San Diego CA, USA (PST)
   "Ouch ouch ouch!"
   "What's wrong? Noodles too hot?"
   "No, I have Chopstick Tunnel Syndrome."

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