1
GATE CSE 2004
MCQ (Single Correct Answer)
+2
-0.6

The employee information in a company is stored in the relation

Employee (name, sex, salary, deptName)

Consider the following SQL query

  Select deptName
  From Employee
  Where sex = ‘M’
  Group by deptName
  Having avg(salary) >
  (Select avg (salary) From Employee);
It returns the names of the department in which
A
the average salary is more than the average salary in the company
B
the average salary of male employees is more than the average salary of all male employees in the company
C
the average salary of male employees is more than the average salary of employees in the same department.
D
the average salary of male employees is more than the average salary in the company
2
GATE CSE 2004
MCQ (Single Correct Answer)
+2
-0.6
A relational database contains two table student and department in which student table has columns roll_no, name and dept_id and department table has columns dept_id and detp_name. the following insert statements were executed successfully to populate the empty tables:
 Insert into department values (1, ‘Mathematics’)
 Insert into department values (2, ‘Physics’)
 Insert into student values (1, ‘Navin’,1)
 Insert into student values (2, ‘Mukesh’,2)
 Insert into student values (3, ‘Gita’,1)
How many rows and columns will be retrieved by the following SQL statement?
Select * from student, department;
A
0 row and 4 columns
B
3 rows and 4 columns
C
3 rows and 5 columns
D
6 rows and 5 columns
3
GATE CSE 2004
MCQ (Single Correct Answer)
+2
-0.6
Consider two tables in a relational database with columns and rows as follows:

 Table: Student

Roll_no Name Dept_id
1 ABC 1
2 DEF 1
3 GHI 2
4 JKL 3

 Table: Department

Dept_id Dept_name
1 A
2 B
3 C

Roll_no is the primary key of the Student table, Dept_id is the primary key of the Department table and Studetn.Dept_id is a foreign key from
Department. Dept_id.

What will happen if we try to execute the following two SQL statements?
(i) update Student set Dept_id = Null where Roll_no =1
(ii) update Department set Dept_id = Null where Dept_id =1
A
Both (i) and (ii) will fail
B
(i) will fail but (ii) will succeed
C
(i) will succeed but (ii) will fail
D
Both (i) and (ii) will succeed
4
GATE CSE 2003
MCQ (Single Correct Answer)
+2
-0.6
Consider the set of relations shown below and the SQL query that follows.

Students: (Roll_number, Name, Date_of_birth)
Courses: (Course number, Course_name, Instructor)
Grades: (Roll_number, Course_number, Grade)

Select distinct Name
From Students, Courses, Grades
Where Students.Roll_number = Grades.Roll_number
      and Courses.Instructor = 'Korth'
      and Courses.Course_number = Grades.Course_number
      and Grades.grade = 'A';
Which of the following sets is computed by the above query?
A
Names of students who have got an A grade in all courses taught by Korth
B
Names of students who have got an A grade in all courses
C
Names of students who have got an A grade in at least one of the courses taught by Korth
D
None of the above
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