Filtering Data in SQL

SQL is a powerful tool for managing and manipulating databases. One of its key capabilities is filtering data to retrieve specific information based on certain criteria.

Filtering Normal Data

Using WHERE Clause with Different Operators

The WHERE clause is fundamental for filtering data in SQL. It can incorporate a variety of operators to specify conditions for data retrieval. Below are some commonly used operators:

1. BETWEEN Operator: Filters results within a range of values.
2. IN Operator: Filters results that match any value in a list.
3. OR and AND Operators: Combine multiple conditions to refine the query.

Examples of Using Different Operators

1. BETWEEN Operator: The BETWEEN operator is used to filter the results within a specific range. It is inclusive, meaning it includes the start and end values.

Example:

SELECT *
FROM employees
WHERE salary BETWEEN 40000 AND 60000;

This query retrieves all employees whose salaries are between $40,000 and $60,000, inclusive.

2. IN Operator: The IN operator allows you to specify multiple values in a WHERE clause. It filters the…