### BITNOT 

#### Overview
The BITNOT function is used to perform a bitwise NOT operation on an integer type expression. This function can handle any integer type input and returns a result of the same type as the input. In addition to using the `bitnot()` function, the `~` operator can also be used to achieve the same functionality.

#### Syntax
```
BITNOT(expr)
```
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```
~expr
```
#### Parameters
- `expr`: An integer type expression that needs to be bitwise negated.

#### Return Value
- Returns the bitwise negated result of the same type as the input `expr`.

####  Example
1. Perform bitwise negation on a single integer:
```sql
SELECT BITNOT(100); -- Return result: -101
SELECT ~100;       -- Return result: -101
```
2. Perform bitwise NOT operation on integers in the query results:
   ```sql
   SELECT BITNOT(column_name) FROM table_name WHERE condition;
   SELECT ~column_name FROM table_name WHERE condition;
   ```
