# MySQL BIT_XOR() function

## BIT_XOR() function

MySQL BIT_XOR() function returns the bitwise XOR of all bits in a given expression. It's particularly useful for scenarios involving bit manipulation and bitwise operations.

The calculation is performed on 64 bit precession.

If this function does not find a matching row, it returns 0.

**What is Bitwise XOR operation**

After taking two bit patterns of equal length, it performs logical XOR operation on each pair of corresponding bits (the first of each; the second of each; and so on).

The result in each position is 1 if the two bits are different, and 0 if they are same.

This function is useful in -

- It calculates the bitwise XOR of each bit position across multiple values.
- The BIT_XOR() function can be used to manipulate and encode data at the bit level. XOR operations are used in cryptography for data encryption and decryption.
- The BIT_XOR() function can help identify discrepancies between sets of binary data.
- In MySQL, the BIT_XOR() function can be useful in defining conditions within triggers or events based on bitwise operations.
- XOR operations are sometimes used in generating hash values or checksums.
- BIT_XOR() can be used with the GROUP BY clause to aggregate data based on a specific column's bitwise XOR results.
- The BIT_XOR() function can help analyze patterns and differences across a subset of records when working with datasets where binary values are used to represent various attributes.

**Syntax:**

BIT_XOR(expr)

Where expr is a given expression.

**MySQL Version:** 8.0

**Example: MySQL BIT_XOR() function**

The following MySQL statement performs Bitwise XOR operation on the values of book_price column. A grouping on book_id column is also performed.

Sample table: book_mast

Code:

```
SELECT book_id, BIT_XOR('book_price')
AS BITS from book_mast group by book_id;
```

Output:

mysql> SELECT book_id, BIT_XOR('book_price') AS BITS from book_mast group by book_id; +---------+------+ | book_id | BITS | +---------+------+ | BK001 | 0 | | BK002 | 0 | | BK003 | 0 | | BK004 | 0 | | BK005 | 0 | | BK006 | 0 | | BK007 | 0 | | BK008 | 0 | | BK009 | 0 | | BK010 | 0 | | BK011 | 0 | | BK012 | 0 | | BK013 | 0 | | BK014 | 0 | | BK015 | 0 | | BK016 | 0 | +---------+------+ 16 rows in set, 16 warnings (0.00 sec)

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