Can I use multiple comparison operators in one WHERE clause?

Yes, you can combine multiple comparison operators using logical operators like AND and OR.

What is the difference between <> and != in MySQL?

Both <> and != mean 'not equal to' in MySQL and can be used interchangeably.

How do comparison operators handle NULL values in MySQL?

Comparison operators return NULL (unknown) when comparing with NULL. Use IS NULL or IS NOT NULL to check for NULL values.

Topic 6512 min readStructured Tutorial

MySQL WHERE Clause: Comparison Operators Tutorial

Quick Answer

In MySQL, the WHERE clause uses comparison operators like =, <, >, <=, >=, and <> to filter records based on conditions. These operators compare column values against specified criteria, enabling precise data retrieval in queries.

Learning Objectives

Understand the purpose of the WHERE clause in MySQL queries.
Identify and use different comparison operators in WHERE conditions.
Write queries that filter data effectively using comparison operators.

Introduction

The WHERE clause in MySQL is used to filter records returned by a query based on specified conditions.

Comparison operators allow you to compare column values against constants or other columns to refine your data selection.

Filtering data precisely is key to effective database querying.

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RPATechnology Team

Last Updated

June 2026

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Operator	Description	Example
=	Checks if two values are equal	WHERE age = 30
<>	Checks if two values are not equal	WHERE status <> 'active'
>	Checks if left value is greater than right	WHERE salary > 50000
<	Checks if left value is less than right	WHERE quantity < 100
>=	Checks if left value is greater or equal	WHERE score >= 75
<=	Checks if left value is less or equal	WHERE date <= '2024-01-01'

Learning Objectives

Introduction

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Recommended Next Topics

Logical Operators

BETWEEN Clause

IN Clause

LIKE Clause

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Understanding Comparison Operators

Using Comparison Operators in WHERE Clause

Example Queries

Practical Example

Examples

Best Practices

Common Mistakes

Hands-on Exercise

Write a Query Using Comparison Operators

Exclude Specific Records

Interview Questions

What is the purpose of the WHERE clause in MySQL?

Name some common comparison operators used in MySQL WHERE clauses.

How do you filter rows where a column is not equal to a value?

MCQ Quiz

1. Which comparison operator in MySQL is used to check if two values are not equal?

2. What will the following query return? SELECT * FROM employees WHERE salary > 50000;

3. In a WHERE clause, which operator would you use to include records where a date is on or before January 1, 2024?

4. Why is it important to use appropriate comparison operators in WHERE clauses?

5. What common mistake might cause an error when using comparison operators in a WHERE clause?

Key Takeaways

Frequently Asked Questions

Can I use multiple comparison operators in one WHERE clause?

What is the difference between <> and != in MySQL?

How do comparison operators handle NULL values in MySQL?

Summary

NULL Handling

Complex Conditions

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