MCQ IN COMPUTER SCIENCE & ENGINEERING

Previous
Next

COMPUTER SCIENCE AND ENGINEERING

SQL

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The total number of tuples in a relation is referred to as
A
Cardinality of the relation
B
Degree of the relation
C
Cartesian product
D
None of the above
Explanation: 

Detailed explanation-1: -The number of tuples in a relation is called its cardinality, while the number of attributes in a relation is called its degree.

Detailed explanation-2: -A tuple is a row of a relation. A domain is a set of allowable values for one or more attributes. The degree of a relation is the number of attributes it contains. The cardinality of a relation is the number of tuples it contains.

Detailed explanation-3: -Examination of the relation tells us that there are just four tuples for which the predicate holds true.

Detailed explanation-4: -Answer: Cardinality refers to the number of tuples/rows in a table whereas, Degree refers to the number of attributes/columns in a table.

Detailed explanation-5: -The number of rows in the table. The number of unique values for a set of columns for leading columns in an index key, also known as cardinality.

There is 1 question to complete.
Previous
Next