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BCSE302L Database Systems (Theory) Fall 2024-25 (A2+TA2) [VL2024250101736]
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Consider the following instances:
Which of the following relational operations will produce the following tuple only?
Consider a relation:
Employees (EmpID, Name, Age, Department)
With 10000 records, and frequent queries on Age.
Which indexing technique would improve query performance?
Given the relations:
Orders (OrderID, CustomerID, OrderDate)
Customers (CustomerID, Name, Address)
Choose the correct relational algebra expression to retrieve the names of customers who placed orders in 2022.
Consider the following schedule S involving five transactions T1,T2,T3,T4and T5:
Choose the correct option for the above transaction schedule.
Consider the following precedence graph and identify the correct order of execution of the transactions.
Choose the incorrect option(s) about indexing from the following
Consider the following relational schema for a university:student(roll no, name, dob)dept(deptNo, dName, location)project(proj no, deptNo, roll no, pName)Identify the correct relational algebraic expression for the following query:
Find the names of students who have selected any project offered by the department “CSE”.
Consider the following tables:
Identify the correct operation(s) which will produce the following output from the above two relations.
A database uses a hash index with chaining collision resolution.
What happens when inserting a record with a key that collides with an existing record?