>>>> As I understand it, this is considered one of the "seminal texts" on 
>>>> relational databases. 
>>>
>>> It was some 25 years ago too. :-)
>>
>> OK, so the book I'm worshiping is a little out of date.
> 
> No. That's my point. It's so seminal that it hasn't needed to be 
> replaced in 25 years either.

The mark of a Special title. ;-)

> My understanding is that the calculus describes "this is the result I 
> want", while the algebra is "follow these steps".  Of course, the steps 
> don't have to be followed in order in the algebra (associative, 
> commutitive, etc), so that's OK.

I wandered into lots of terms like "universal quantification" and got 
horribly lost...

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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