Question

What operator tests column for the absence of data?
A) NOT operator
B) IS NULL operator
C) EXISTS operator
D) All of the above

Answer 1

Answer:

What operator tests column for the absence of data

Option b

Answer 2

Answer:

The operator that tests column for the absence of data is an option "B) is NULL operator". The reason for this answer is because the NULL operator is used in the database for representing that a particular field is empty.

Explanation:

When there are fields created in a database table, at that time data are inserted as well. This is done for the purpose of retrieving the particular data when needed. The field in which no data is allocated, that time the NULL is used.