# **BIT_OR**

## **Function Description**

BIT_OR() is an aggregate function that calculates the bitwise or OR of all bits in a column.

## **Function Syntax**

```text
> BIT_OR(expr)
```

## **Parameter definition**

| Parameters | Description |
| ---- | ---- |
| expr | Column of type UINT |

## **Example**

```text
> drop table if exists t1;
> CREATE TABLE t1 (id CHAR(1), number INT);
> INSERT INTO t1 VALUES
      ('a',111),('a',110),('a',100),
      ('a',000),('b',001),('b',011);

> select id, BIT_OR(number) FROM t1 GROUP BY id;
+------------------------------+
| id | bit_or(number) |
+------------------------------+
| a | 111 |
| b | 11 |
+------------------------------+
```