> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/sql-structure/operators/logical-operators/xor.md).

# XOR

## Syntax

```bnf
XOR
```

## Description

`XOR` stands for eXclusive OR. Returns `NULL` if either operand is `NULL`. For non-`NULL` operands, evaluates to `1` if an odd number of operands is non-zero, otherwise `0` is returned.

## Examples

```sql
SELECT 1 XOR 1;
+---------+
| 1 XOR 1 |
+---------+
|       0 |
+---------+

SELECT 1 XOR 0;
+---------+
| 1 XOR 0 |
+---------+
|       1 |
+---------+

SELECT 1 XOR NULL;
+------------+
| 1 XOR NULL |
+------------+
|       NULL |
+------------+
```

In the following example, the right `1 XOR 1` is evaluated first, and returns `0`. Then, `1 XOR 0` is evaluated, and `1` is returned.

```sql
SELECT 1 XOR 1 XOR 1;
+---------------+
| 1 XOR 1 XOR 1 |
+---------------+
|             1 |
+---------------+
```

## See Also

* [Operator Precedence](/docs/server/reference/sql-structure/operators/operator-precedence.md)

<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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