Choose the option that correctly explains in words, the function of the following relational algebra expression year 2009 (book borrow)

tSelects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009

tSelects all tuples from the Cartesian product of book and borrow

tSelects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009

tSelects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009

tSelects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009

Statement 1: A tuple is a row in a relation Statement 2: Existence of multiple foreign keys in a same relation is possible

tStatement 1 is correct but Statement 2 is false

tStatement 1 is false but Statement 2 is correct

What does the x operator do in relational algebra?

tReturns the rows of the input relation that satisfy the predicate

tOutput specified attributes from all rows of the input relation. Remove duplicate tuples from the output

tOutput pairs of rows from the two input relations that have the same value on all attributes that have the same name

tOutput all pairs of rows from the two input relations (regardless of whether or not they have the same values on common attributes)

tReturns the rows of the input relation that satisfy the predicate

What action does operator perform in relational algebra

tOutputs pairs of rows from the two input relations that have the same value on all attributes that have the same name

tOutput specified attributes from all rows of the input relation and remove duplicate tuples from the output

tOutputs pairs of rows from the two input relations that have the same value on all attributes that have the same name

tOutput all pairs of rows from the two input relations (regardless of whether or not they have the same values on common attributes)

tReturn rows of the input relation that satisfy the predicate

Explore topic-wise MCQs in Rdbms.

This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Rdbms knowledge and support exam preparation. Choose a topic below to get started.

1.	Choose the option that correctly explains in words, the function of the following relational algebra expression year 2009 (book borrow)
A.	tSelects all tuples from the Cartesian product of book and borrow
B.	tSelects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009
C.	tSelects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009
D.	tSelects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009
Answer» C. tSelects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009

Discussion

2.	Statement 1: A tuple is a row in a relation Statement 2: Existence of multiple foreign keys in a same relation is possible
A.	tBoth the statements are true
B.	tStatement 1 is correct but Statement 2 is false
C.	tStatement 1 is false but Statement 2 is correct
D.	tBoth the statements are false
Answer» B. tStatement 1 is correct but Statement 2 is false

Discussion

3.	What does the x operator do in relational algebra?
A.	tOutput specified attributes from all rows of the input relation. Remove duplicate tuples from the output
B.	tOutput pairs of rows from the two input relations that have the same value on all attributes that have the same name
C.	tOutput all pairs of rows from the two input relations (regardless of whether or not they have the same values on common attributes)
D.	tReturns the rows of the input relation that satisfy the predicate
Answer» D. tReturns the rows of the input relation that satisfy the predicate

Discussion

4.	What action does operator perform in relational algebra
A.	tOutput specified attributes from all rows of the input relation and remove duplicate tuples from the output
B.	tOutputs pairs of rows from the two input relations that have the same value on all attributes that have the same name
C.	tOutput all pairs of rows from the two input relations (regardless of whether or not they have the same values on common attributes)
D.	tReturn rows of the input relation that satisfy the predicate
Answer» B. tOutputs pairs of rows from the two input relations that have the same value on all attributes that have the same name

Discussion