69) A primary key is combined with a foreign key creates

Parent-Child relationship between the tables that connect them

Many to many relationship between the tables that connect them.

Network model between the tables that connect them.

None of the above

Answer is:

Parent-Child relationship between the tables that connect them

Databases MCQ with Answers

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71) Cross Product is a:

Unary Operator

Ternary Operator

Binary Operator

Not an operator

Answer is:

Binary Operator

72) An instance of relational schema R (A, B, C) has distinct values of A including NULL values. Which one of the following is true

A is a candidate key

A is not a candidate key

A is a primary Key

Both (A) and (C)

Answer is:

A is not a candidate key

73) Consider the join of a relation R with relation S. If R has m tuples and S has n tuples,then the maximum size of join is:

m+n

(m+n)/2

2(m+n)

Answer is:

mn

74) The natural join is equal to :

Cartesian Product

Combination of Union and Cartesian product

Combination of selection and Cartesian product

Combination of projection and Cartesian product

Answer is:

Combination of selection and Cartesian product

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69) A primary key is combined with a foreign key creates

Parent-Child relationship between the tables that connect them

Databases MCQ with Answers

Related Databases MCQ with Answers

71) Cross Product is a:

Binary Operator

72) An instance of relational schema R (A, B, C) has distinct values of A including NULL values. Which one of the following is true

A is not a candidate key

73) Consider the join of a relation R with relation S. If R has m tuples and S has n tuples,then the maximum size of join is:

mn

74) The natural join is equal to :

Combination of selection and Cartesian product

Databases MCQ with Answers