1

GATE CSE 2019

Numerical

+2

-0.67

Consider the following relations P(X,Y,Z), Q(X,Y,T) and R(Y,V).

How many tuples will be returned by the following relational algebra query?

How many tuples will be returned by the following relational algebra query?

Your input ____

2

GATE CSE 2018

MCQ (Single Correct Answer)

+2

-0.6

Consider the relations $$r(A, B)$$ and $$s(B, C),$$ where $$s.B$$ is a primary key and $$r.B$$ is a foreign key referencing $$s.B.$$ Consider the query

$$Q:$$ $$\,\,\,\,\,\,\,\,\,$$ $$r$$ $$\,\,\,\,$$ $$\bowtie$$ $$\,\,\,\,$$ $$\left( {{\sigma _{b < 5}}\left( s \right)} \right)$$

Let $$LOJ$$ denote the natural left outer-join operation. Assume that $$r$$ and $$s$$ contain no null values.

Which one of the following queries is NOT equivalent to $$Q$$?

3

GATE CSE 2015 Set 2

MCQ (Single Correct Answer)

+2

-0.6

Consider two relations $${R_1}\left( {A,B} \right)$$ with the tuples $$(1,5), (3,7)$$ and $${R_2}\left( {A,C} \right) = \left( {1,7} \right),\left( {4,9} \right).$$

Assume that $$R(A,B,C)$$ is the full natural outer join of $${R_1}$$ and $${R_2}$$. Consider the following tuples of the form $$(A,B,C): a = (1,5,null),$$ $$b = (1,null,7),$$ $$c = (3, null, 9),$$ $$d = (4,7,null),$$ $$e = (1,5,7),$$ $$f = (3,7,null),$$ $$g = (4,null,9).$$ Which one of the following statements is correct?

Assume that $$R(A,B,C)$$ is the full natural outer join of $${R_1}$$ and $${R_2}$$. Consider the following tuples of the form $$(A,B,C): a = (1,5,null),$$ $$b = (1,null,7),$$ $$c = (3, null, 9),$$ $$d = (4,7,null),$$ $$e = (1,5,7),$$ $$f = (3,7,null),$$ $$g = (4,null,9).$$ Which one of the following statements is correct?

4

GATE CSE 2014 Set 3

MCQ (Single Correct Answer)

+2

-0.6

Consider the relational schema given below, where

**eId**of the relation**dependent**is a foreign key referring to**empId**of the relation**employee**. Assume that every employee has at least one associated dependent in the dependent relation:**employee ( empId, empName, empAge)**

**dependent ( depId, eId, depName, depAge)**

The above query evaluates to the set of empIds of employees whose age is greater than that of

Questions Asked from Relational Algebra (Marks 2)

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