Welcome to DataBase Quiz, Advanced Level !!

Question 1. View text definitions are stored in which system table?





Question 2. Given the following relation instance.
x  y  z
1  4  2
1  5  3
1  6  3
3  2  2 
Which of the following functional dependencies are satisfied by the instance?

XY -> Z and Z -> Y

YZ -> X and Y -> Z

YZ -> X and X -> Z

XZ -> Y and Y -> X

Question 3. 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 4. What is the best data type to store the birthdays of the US Presidents, starting with George Washington's birthday of February 22, 1732?





Question 5. The highest level in the hierarchy of data organization is called

data bank

data base

data file

data record

Question 6. 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 7. What will be the output of the following statement? SET ARITHABORT OFF SET ANSI_WARNINGS OFF SELECT 100/0





Question 8. What will be the output of the following statement? SELECT ROUND(123.89, -1)





Question 9. 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 10. Which of the following is true of a network structure?

It is a physical representation of the data

It allows a many-to-many relationship

It is conceptually simple

It will be dominant data base of the future