Consider the following two relations, R(A,B) and S(A,C):R: (10,20), (20,30), (30,40), (30,50)S: (10,90), (30,45), (40,80), (50,95)The total number of tuples obtained by evaluating sigma_{B < C}(R join_{R.A=S.A} S) is _________

Answer: 2Concept -- Relational Algebra: Join and Selection (from Ramakrishnan and Gehrke, Database Management Systems):Step 1: Compute R join S on R.A = S.A.Match R.A = S.A:R(10,20) joins S(10,90): tuple (10, 20, 90).R(20,30): no match in S (S has no A=20).R(30,40) joins S(30,45): tuple (30, 40, 45).R(30,50) joins S(30,45): tuple (30, 50, 45).Join result: {(10,20,90), (30,40,45), (30,50,45)}.Step 2: Apply sigma_{B < C}:(10, 20, 90): B=20, C=90. 20 < 90 is TRUE. Keep.(30, 40, 45): B=40, C=45. 40 < 45 is TRUE. Keep.(30, 50, 45): B=50, C=45. 50 < 45 is FALSE. Discard.Total tuples satisfying B < C = 2.

GATE-CS is a competitive examination conducted in India. This question is from the 2024 GATE-CS Database Management Systems paper.

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GATE-CS Database Management Systems 2024 - Consider the...

Q: What is GATE-CS?

GATE-CS is a competitive examination conducted in India. This question is from the 2024 GATE-CS Database Management Systems paper.

Q: How can I prepare for GATE-CS Database Management Systems?

To prepare for GATE-CS Database Management Systems, practice previous year questions (PYQs), understand concepts thoroughly, and solve mock tests regularly. This 2024 question covers Relational Model (Relational Algebra and Tuple Calculus) topic.

Q: What is the difficulty level of this question?

This GATE-CS 2024 Database Management Systems question has a easy difficulty level and is marked as an important question.

Q: Where can I find more GATE-CS previous year questions?

You can find more GATE-CS previous year questions on AspirantMitraa. Browse by subject, topic, year, and difficulty level to practice effectively.

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