sql and relational theory, Complete IT Books Pack

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SQL and
Relational Theory
How to Write Accurate SQL Code
SECOND EDITION
C. J. Date
SQL and Relational Theory: How to Write Accurate SQL Code
(2
nd
edition)
by C. J. Date
Copyright © 2012 C. J. Date. All rights reserved.
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Printing History:
January 2009: First Edition.
December 2011: Second Edition.
Revision History:
2011-12-08 First release
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ISBN: 978-1-449-31640-2
[LSI]
Those who are enamored of practice without theory are like a
pilot who goes into a ship without rudder or compass
and never has any certainty where he is going
Practice should always be based upon
a sound knowledge of theory.
—
Leonardo da Vinci (1452–1519)
The trouble with people is not that they don’t know
but that they know so much that ain’t so.
—
Josh Billings (1818–1885)
Languages die...
mathematical ideas do not.
—
G. H. Hardy (1877–1947)
Unfortunately, the gap between theory and practice
is not as wide in theory as it is in practice.
—
Anon.
These are my principles.
If you don’t like them, I have others.
—
Groucho Marx (1890–1977)
There is no royal road to geometry.
—
Euclid (c. 365–275 BCE), attrib.
———
®®®®®
———
To all those who think an exercise like this one is worthwhile,
and in particular to the memory of Lex de Haan,
who is very much missed
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