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# MySQL | XOR

schedule Aug 12, 2023
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MySQL
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MySQL's `XOR` operator returns `1` if an odd number of operands is nonzero or `0` if an even number of operands is nonzero. If either operand is `NULL` we return `NULL`.

# Syntax

``` SELECT value1 XOR value2 XOR value3; ```

# Examples

## Odd nonzero operands

To check whether we have an odd number of nonzero operands:

``` SELECT 3 XOR 4 XOR 5; +---------------+| 3 XOR 4 XOR 5 |+---------------+| 1 |+---------------+ ```

As we have 3 non-zero operands, `1` is returned.

## Even nonzero operands

To check whether we have an odd number of nonzero operands:

``` SELECT 3 XOR 4; +---------+| 3 XOR 4 |+---------+| 0 |+---------+ ```

As we have 2 nonzero operands, `0` is returned.

## NULL operand

To check whether we have an odd number of nonzero operands:

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

As one of the operands is `NULL`, `NULL` is returned.

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