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MySQL | IS NULL

Database
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MySQL
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Documentation
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Operators
schedule Jul 1, 2022
Last updated
local_offer MySQL
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MySQL's IS NULL operator tests whether a value is NULL. It returns 0 if the value is not NULL and 1 if the value is NULL.

Syntax

SELECT value IS NULL;
SELECT column IS NULL
FROM table_name;

Examples

Consider the following table about students' extracurricular activities:

student_id

club

date_entered

1

Football

2016-02-13

2

Boxing

2016-05-25

3

Apple

2018-08-17

4

Fishing

2017-01-01

5

NULL

NULL

The above sample table can be created using the code here.

Basic usage

To check whether club is NULL for each student:

SELECT student_id, club IS NULL
FROM extracurricular;
+------------+--------------+
| student_id | club IS NULL |
+------------+--------------+
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
+------------+--------------+

Note that club IS NULL returns 1 for student_id=5 as the student is not part of any club.

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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