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SQL 1.21 SQL BETWEEN

Mastering SQL: Understanding the SQL BETWEEN Operator


SQL (Structured Query Language) is a powerful language used for managing and manipulating data in relational database systems. One fundamental aspect of SQL is filtering data based on certain conditions. The SQL BETWEEN operator is commonly used to select values within a specified range. In this tutorial, we’ll delve into the details of the SQL BETWEEN operator, its syntax, usage, and examples to help you grasp its concepts effectively.

Understanding the SQL BETWEEN Operator


The SQL BETWEEN operator is used to retrieve values within a specified range. It’s typically used in the WHERE clause of a SELECT statement to filter rows based on a range of values.

  1. Syntax:
    The syntax for using the SQL BETWEEN operator is as follows:
SELECT column_name(s)
FROM table_name
WHERE column_name BETWEEN value1 AND value2;

Here,

  • column_name(s): The name(s) of the column(s) from which you want to retrieve data.
  • table_name: The name of the table from which you want to retrieve data.
  • column_name: The column you want to apply the BETWEEN condition to.
  • value1, value2: The range of values to filter.
  1. Examples:
    Let’s consider a sample table named ’employees’ with the following structure:
employee_idfirst_namelast_namesalary
1JohnDoe50000
2JaneSmith60000
3AliceJohnson70000
4BobBrown45000
5EmilyDavis55000

Now, let’s explore some examples of using the SQL BETWEEN operator:

Example 1: Retrieve employees with salaries between $50,000 and $60,000.

SELECT *
FROM employees
WHERE salary BETWEEN 50000 AND 60000;

Output:

employee_idfirst_namelast_namesalary
1JohnDoe50000
5EmilyDavis55000

Explanation:
This query selects all columns from the ’employees’ table where the ‘salary’ column falls between 50000 and 60000 inclusive.

Example 2: Retrieve employees with salaries not between $45,000 and $55,000.

SELECT *
FROM employees
WHERE salary NOT BETWEEN 45000 AND 55000;

Output:

employee_idfirst_namelast_namesalary
2JaneSmith60000
3AliceJohnson70000

Explanation:
This query selects all columns from the ’employees’ table where the ‘salary’ column does not fall between 45000 and 55000.

Conclusion


In this tutorial, we’ve covered the basics of the SQL BETWEEN operator, including its syntax, usage, and examples. Understanding how to use the SQL BETWEEN operator is crucial for filtering data within specific ranges in SQL queries, allowing you to retrieve the desired information from your database effectively. Practice with different scenarios to solidify your understanding of this important SQL concept.

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