# **BIT_AND**

## **Function Description**

BIT_AND() is an aggregate function that calculates the bitwise aggregation of all bits in a column.

## **Function Syntax**

```text
> BIT_AND(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_AND(number) FROM t1 GROUP BY id;
+---------------------------------+
| id | bit_and(number) |
+---------------------------------+
| a | 0 |
| b | 1 |
+---------------------------------+
```