# ISNULL

## Syntax

```sql
ISNULL(expr)
```

## Description

If *`expr`* is `NULL`, `ISNULL()` returns `1`, otherwise it returns 0.

See also [NULL Values in MariaDB](https://mariadb.com/docs/server/reference/data-types/null-values).

## Examples

```sql
SELECT ISNULL(1+1);
+-------------+
| ISNULL(1+1) |
+-------------+
|           0 |
+-------------+

SELECT ISNULL(1/0);
+-------------+
| ISNULL(1/0) |
+-------------+
|           1 |
+-------------+
```

<sub>*This page is licensed: GPLv2, originally from*</sub> [<sub>*fill\_help\_tables.sql*</sub>](https://github.com/MariaDB/server/blob/main/scripts/fill_help_tables.sql)

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