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MySQL | IS NOT NULL

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

Syntax

SELECT value IS NOT NULL;
SELECT column IS NOT 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 NOT NULL for students:

SELECT student_id, club IS NOT NULL
FROM extracurricular;
+------------+------------------+
| student_id | club IS NOT NULL |
+------------+------------------+
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 0 |
+------------+------------------+

0 is returned for student_id=5 as club is NULL.

Use with WHERE clause

The IS NOT NULL operator can be used in conjunction with WHERE to filter out missing values:

SELECT *
FROM extracurricular
WHERE club IS NOT NULL;
+------------+----------+--------------+
| student_id | club | date_entered |
+------------+----------+--------------+
| 1 | Football | 2016-02-13 |
| 2 | Boxing | 2016-05-25 |
| 3 | Chess | 2018-08-17 |
| 4 | Fishing | 2017-01-01 |
+------------+----------+--------------+

We can see the record for student_id=5 has been filtered out.

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Published by Arthur Yanagisawa
Edited by 0 others
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