Relational Model Introduction - E-Courses
Relational Model Introduction - E-Courses
Relational Model Introduction - E-Courses
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S = (A, B), R = (A, B, C, D), X = (C, D)<br />
x = r s<br />
÷<br />
s<br />
x<br />
A B<br />
a b<br />
1 1<br />
a b<br />
2 2<br />
C D<br />
c 1 d 1<br />
c 3 d 3<br />
r<br />
A B C D<br />
a b c d<br />
1 1 1 1<br />
a b c d<br />
2 2 1 1<br />
a b c d<br />
1 1 2 2<br />
a b c d<br />
1 1 3 3<br />
a b c d<br />
2 2 3 3<br />
(c 2 , d 2 ) is not present in the result of division as it does not appear<br />
in combination with all the tuples of s in r<br />
Prof P Sreenivasa Kumar<br />
Department of CS&E, IITM<br />
36
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