Welcome to DataBase Quiz, Advanced Level !!

Question 1. The highest level in the hierarchy of data organization is called

data bank

data base

data file

data record

Question 2. What type of lock will deny users any access to a table?

EXPLICIT

IMPLICIT

EXCLUSIVE

READ ONLY

Question 3. What is the best data type to store the birthdays of the US Presidents, starting with George Washington's birthday of February 22, 1732?

DATETIME

INT

SMALLDATETIME

VARCHAR

Question 4. Given relations r(w, x) and s(y, z), the result of
  select distinct w, x from r, s
is guaranteed to be same as r, provided

r has no duplicates and s is non-empty

r and s have no duplicates

s has no duplicates and r is non-empty

r and s have the same number of tuples

Question 5. What will be the output of the following statement? SET ARITHABORT OFF SET ANSI_WARNINGS OFF SELECT 100/0

Null

0

Infinity

Error

Question 6. In SQL, relations can contain null values, and comparisons with null values are treated as unknown. Suppose all comparisons with a null value are treated as false. Which of the following pairs is not equivalent?

x = 5, not (not (x = 5))

x = 5, x > 4 and x < 6, where x is an integer

x < 5, not(x = 5)

none of the above

Question 7. View text definitions are stored in which system table?

sysobjects

syscolumns

syscomments

sysviews

Question 8. Consider a schema R(A, B, C, D) and functional dependencies A -> B and C -> D. Then the decomposition of R into R1 (A, B) and R2(C, D) is

dependency preserving and loss less join

loss less join but not dependency preserving

dependency preserving but not loss less join

not dependency preserving and not loss less join

Question 9. What will be the output of the following statement? SELECT ROUND(123.89, -1)

120.00

123.00

123.90

124.00

Question 10. Given the relations
employee (name, salary, deptno) and department (deptno, deptname, address)
Which of the following queries cannot be expressed using the basic relational algebra operations (U, -, x, , p)?

Department address of every employee

Employees whose name is the same as their department name

The sum of all employees? salaries

All employees of a given department