Question

What operator tests column for the absence of data?​

Answer 1

Answer:

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:

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Answer 2

The IS NULL operator tests a column for the absence of data

. It is used to determine if a column in a database table contains a NULL value, which represents the absence of data. The IS NULL operator returns a Boolean value of true if the column is NULL, and false if it is not. The syntax of the IS NULL operator in SQL is as follows:

column_name IS NULL

For example, to check if the "name" column in a "customers" table contains a NULL value, you would use the following query:

SELECT * FROM customers WHERE name IS NULL;

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