Register

DBMS Korth Edition 6 Exercise 6 Question 5 (Page No. 251)

• edited by
1,889 views
1 votes
1 votes
Let the following relation schemas be given:
R = (A, B,C)
S = (D, E, F)
Let relations r(R) and s(S) be given. Give an expression in the tuple relational
calculus that is equivalent to each of the following:
a.   $\prod _A(r)$
b.   $\sigma _{B =17} (r )$
c.   r × s
d.  $\prod _{A,F} (\sigma _{C = D}(r × s))$
• edited by
User Avatar

Please log in or register to answer this question.

Voting & Accepting an answer helps improve the community
← PreviousNext →
← Previous in categoryNext in category →

Related questions

0 votes
0 votes
1 answer
4
ajaysoni1924 asked Mar 27, 2019
709 views
DBMS Korth Edition 6 Exercise 6 Question 18 (Page No. 254)
Let R = (A, B) and S = (A, C), and let r (R) and s(S) be relations. Using the special constant null, write tuple-relational-calculus expressions equivalent to each of the following: a. r $ROJ$ s b. r $FOJ$ s c. r $LOJ$ s
Let R = (A, B) and S = (A, C), and let r (R) and s(S) be relations.Using the special constant null, write tuple-relational-calculus expressionsequivalent to each of the f...
User Avatar
Link Copied!