SQL Comparison Operator

Ahmet Taşdemir

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Jan 13, 2023

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This reading aims to provide a deeper understanding of SQL comparison operators and their usage in filtering data. By the end of this, you will have a better grasp of how to use these operators in the WHERE clause of SELECT statements to effectively retrieve specific records from a table. The examples provided will include both basic and advanced scenarios.

• Basic scenario: Retrieve all customers with a specific last name

SELECT * FROM customers WHERE last_name = 'Smith'

• Advanced scenario: Retrieve all products that cost more than $50 and have a rating greater than 4

SELECT * FROM products WHERE price > 50 AND rating > 4

• Basic scenario: Retrieve all employees who joined the company before January 1, 2020

SELECT * FROM employees WHERE hire_date < '2020-01-01'

• Advanced scenario: Retrieve all orders that have a total value greater than or equal to $1000 and were placed in the last 30 days

SELECT * FROM orders WHERE total_value >= 1000 AND date_placed >= DATEADD(day, -30, GETDATE())

• Basic scenario: Retrieve all students whose GPA is less than 2.0

SELECT * FROM students WHERE gpa < 2.0