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Foundations of Deductive Databases and Logic Programming
book

Foundations of Deductive Databases and Logic Programming

by Jack Minker
May 2014
Intermediate to advanced content levelIntermediate to advanced
752 pages
35h 3m
English
Morgan Kaufmann
Content preview from Foundations of Deductive Databases and Logic Programming
374
Manchanda and Warren
exists_emp es
(
Ename, Sal )
(inc_sal
(
Inc ))
~+
1
exists_emp
(inc_sal
(
Inc
) >
(-es(Ename,Sal))
(NewSal is Sal + Inc &
(inc_sal(Inc) )
(
(+es(Ename,NewSal) )
)
)
The first rule in the definition of inc_sal says that if there are no
employees in a current database state /, then the same database state should be
returned as the updated database state, that is, (/,/) Ε M
d
( inc_sal
(
Inc
)
).
The second rule says that a database state L is accessible from a current
database state / through inc_sal(Inc) (that is, (7,L) Ε Af
i/
(inc_sal
(Inc) )), if / and L satisfy the conjunction of the following statements: The
state J ...
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Publisher Resources

ISBN: 9781483221120