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The IS NULL operator in SQL is used to test for the presence of NULL values in a column. Unlike other values, NULL represents unknown or missing data, and can’t be checked using standard comparison operators like = or !=.
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What does IS NULL check for in SQL?
Which SQL clause correctly finds rows with NULL in the email column?
What will WHERE age IS NOT NULL return?
What is the result of comparing NULL = NULL in SQL?
Which operator is invalid for checking NULL values?
Which rows will be returned by:
SELECT * FROM students WHERE phone IS NULL;
What is the output of WHERE salary != NULL?
What does the following query return?
SELECT * FROM employees WHERE manager_id IS NOT NULL;
In SQL, what does NULL represent?
Which statement is true about NULL in SQL?
What does SELECT COUNT(column_name) do with NULL values?
Which query shows rows where birthdate has no value?
What will SUM(salary) do if some rows have NULL salary?
How to count only the NULL values in a column?
Which of the following is a valid SQL expression?
This quiz focuses on the correct usage of the IS NULL operator and highlights common pitfalls when dealing with missing or unknown values in SQL queries.
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