# !

## Syntax

```sql
NOT, !
```

## Description

Logical `NOT`. Evaluates to `1` if the operand is `0`, to `0` if the operand is non-zero, and `NOT NULL` returns `NULL`.

By default, the `!` operator has a [higher precedence](https://mariadb.com/docs/server/reference/sql-structure/operators/operator-precedence). If the `HIGH_NOT_PRECEDENCE` [SQL\_MODE](https://mariadb.com/docs/server/server-management/variables-and-modes/sql_mode) flag is set, `NOT` and `!` have the same precedence.

## Examples

```sql
SELECT NOT 10;
+--------+
| NOT 10 |
+--------+
|      0 |
+--------+

SELECT NOT 0;
+-------+
| NOT 0 |
+-------+
|     1 |
+-------+

SELECT NOT NULL;
+----------+
| NOT NULL |
+----------+
|     NULL |
+----------+

SELECT ! (1+1);
+---------+
| ! (1+1) |
+---------+
|       0 |
+---------+

SELECT ! 1+1;
+-------+
| ! 1+1 |
+-------+
|     1 |
+-------+
```

## See Also

* [Operator Precedence](https://mariadb.com/docs/server/reference/sql-structure/operators/operator-precedence)

<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)

{% @marketo/form formId="4316" %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://mariadb.com/docs/server/reference/sql-structure/operators/logical-operators/not.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.