MCQ IN COMPUTER SCIENCE & ENGINEERING

COMPUTER SCIENCE AND ENGINEERING

SQL

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Number of columns in a table is called Cardinality. True or False?

A	True
B	False
C	Either A or B
D	None of the above

Explanation:

Detailed explanation-1: -Answer:-The number of columns in a table is known as range .

Detailed explanation-2: -In a database context, cardinality refers to the number of unique values in a relational table column relative to the total number of rows in the table.

Detailed explanation-3: -Degree-The number of attributes or columns in a relation is called the Degree of the relation. Cardinality-The number of tuples/ rows in a relation is called the Cardinality of the relation.

Detailed explanation-4: -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.

Detailed explanation-5: -Cardinality’s official, non-database dictionary definition is mathematical: the number of values in a set. When applied to databases, the meaning is a bit different: it’s the number of distinct values in a table column relative to the number of rows in the table. Repeated values in the column don’t count.

There is 1 question to complete.