Between Operator in SQL | Structured Query Language

In SQL (Structured Query Language), the BETWEEN operator is used to filter data within a specific range of values in a WHERE clause of a SELECT statement. The basic syntax of the BETWEEN operator is as follows:

```
SELECT column1, column2, ...
FROM table_name
WHERE column_name BETWEEN value1 AND value2;
```

- `column1, column2, ...` are the names of the columns you want to retrieve data from.
- `table_name` is the name of the table you want to retrieve data from.
- `column_name` is the name of the column you want to filter data for.
- `value1` and `value2` are the lower and upper limits of the range you want to filter data for.

The BETWEEN operator returns all records where the value of the `column_name` is between `value1` and `value2`, inclusive.

For example, if you have a table named "employees" with columns "id", "name", "age", and "salary", and you want to retrieve the records where the age is between 30 and 40, you can use the following SQL statement:

```
SELECT id, name, age, salary
FROM employees
WHERE age BETWEEN 30 AND 40;
```

This will retrieve all records from the "employees" table where the age is between 30 and 40, inclusive.

You can also use the NOT BETWEEN operator to retrieve all records where the value of the `column_name` is not between `value1` and `value2`.