# MySQL BIT_OR() function

## BIT_OR() function

MySQL BIT_OR() function returns the bitwise OR of all bits in a given expression.

The calculation is performed on 64 bit precession.

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

**What is Bitwise OR operation **

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

In each pair, the result is 1 if the first bit is 1 OR the second bit is 1 OR both bits are 1, and otherwise the result is 0.

This function is useful in -

- It calculates the bitwise OR of each bit position across multiple values.
- In many applications, flags or bit fields are used to represent multiple binary options in a single value. The BIT_OR() function can be used to set (turn on) specific flags in a set of values.
- The BIT_OR() function can be used to manipulate specific bits within binary values.
- In MySQL, the BIT_OR() function can be useful in defining conditions within triggers or events based on bitwise operations.
- The BIT_OR() function can combine or merge multiple values based on specific bitwise rules.
- BIT_OR() can be used with the GROUP BY clause to aggregate data based on a specific column's bitwise OR results.
- The BIT_OR() function can help analyze common attributes across a subset of records.
- The BIT_OR() function can be used to create checksums or hash values based on certain bit patterns.

**Syntax**

BIT_OR(expr)

Where expr is a given expression.

**MySQL Version:** 8.0

**Example: MySQL BIT_OR() function **

The following MySQL statement performs Bitwise OR 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_OR('book_price') AS BITS
FROM book_mast group by book_id;
```

Output:

mysql> SELECT book_id, BIT_OR('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)

**Weekly Trends**- 100 Python Projects for Beginners with solution
- Mastering NumPy: 100 Exercises with solutions
- SQL Tutorial
- SQL Inner Join
- Python Exercises, Practice, Solution
- Python Interview Questions and Answers: Comprehensive Guide
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript HTML Form Validation
- Java Collection Exercises