1
GATE CSE 2004
MCQ (Single Correct Answer)
+1
-0.3
Let R1 (A, B, C) and R2 (D, E) be two relation schema, where the primary keys are shown underlined, and let C be a foreign key in R1 referring to R2. Suppose there is no violation of the above referential integrity constraint in the corresponding relation instances r1 and r2. Which one of the following relational algebra expressions would necessarily produce an empty relation?
2
GATE CSE 2004
MCQ (Single Correct Answer)
+2
-0.6
Consider the relation Student (name, sex, marks), where the primary key is shown underlined, pertaining to students in a class that has at least one boy and one girl. What does the following relational algebra expression produce?
(Note: ρ is the rename operator).
![GATE CSE 2004 Database Management System - Relational Algebra Question 21 English](https://gateclass.cdn.examgoal.net/9NQBCIMxVFLLZczE8/8w8ZUnChbRiI9Fbl4GuPEsyVtT1Xa/2ID1OT3QAMpMXRMu4WRVUR/uploadfile.jpg)
![GATE CSE 2004 Database Management System - Relational Algebra Question 21 English](https://gateclass.cdn.examgoal.net/9NQBCIMxVFLLZczE8/8w8ZUnChbRiI9Fbl4GuPEsyVtT1Xa/2ID1OT3QAMpMXRMu4WRVUR/uploadfile.jpg)
3
GATE CSE 2004
MCQ (Single Correct Answer)
+1
-0.3
Which level of locking provides the highest degree of concurrency in a relational database?
4
GATE CSE 2004
MCQ (Single Correct Answer)
+2
-0.6
Consider the following schedule S of transactions T1 and T2:
Which of the following is TRUE about the schedule S?
Paper analysis
Total Questions
Algorithms
9
Compiler Design
3
Computer Networks
9
Computer Organization
11
Data Structures
14
Database Management System
13
Digital Logic
8
Discrete Mathematics
30
Operating Systems
7
Programming Languages
6
Theory of Computation
5
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