# BIT\_XOR

## Syntax

```sql
BIT_XOR(expr) [over_clause]
```

## Description

Returns the bitwise XOR of all bits in `expr`. The calculation is performed with 64-bit ([BIGINT](https://mariadb.com/docs/server/reference/data-types/numeric-data-types/bigint)) precision. It is an [aggregate function](https://mariadb.com/docs/server/reference/sql-functions/aggregate-functions), and so can be used with the [GROUP BY](https://mariadb.com/docs/server/reference/sql-statements/data-manipulation/selecting-data/group-by) clause.

If no rows match, `BIT_XOR` will return a value with all bits set to `0`. NULL values have no effect on the result unless all results are NULL, which is treated as no match.

`BIT_XOR` can be used as a [window function](https://mariadb.com/docs/server/reference/sql-functions/special-functions/window-functions) with the addition of the *over\_clause*.

## Examples

```sql
CREATE TABLE vals (x INT);

INSERT INTO vals VALUES(111),(110),(100);

SELECT BIT_AND(x), BIT_OR(x), BIT_XOR(x) FROM vals;
+------------+-----------+------------+
| BIT_AND(x) | BIT_OR(x) | BIT_XOR(x) |
+------------+-----------+------------+
|        100 |       111 |        101 |
+------------+-----------+------------+
```

As an [aggregate function](https://mariadb.com/docs/server/reference/sql-functions/aggregate-functions):

```sql
CREATE TABLE vals2 (category VARCHAR(1), x INT);

INSERT INTO vals2 VALUES
  ('a',111),('a',110),('a',100),
  ('b','000'),('b',001),('b',011);

SELECT category, BIT_AND(x), BIT_OR(x), BIT_XOR(x) 
  FROM vals GROUP BY category;
+----------+------------+-----------+------------+
| category | BIT_AND(x) | BIT_OR(x) | BIT_XOR(x) |
+----------+------------+-----------+------------+
| a        |        100 |       111 |        101 |
| b        |          0 |        11 |         10 |
+----------+------------+-----------+------------+
```

No match:

```sql
SELECT BIT_XOR(NULL);
+---------------+
| BIT_XOR(NULL) |
+---------------+
|             0 |
+---------------+
```

## See Also

* [BIT\_AND](https://mariadb.com/docs/server/reference/sql-functions/aggregate-functions/bit_and)
* [BIT\_OR](https://mariadb.com/docs/server/reference/sql-functions/aggregate-functions/bit_or)

<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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