Can I use multiple comparison operators in one WHERE clause?

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

What happens if I omit the WHERE clause in a SELECT statement?

The query returns all rows from the specified table without filtering.

Is the <> operator the same as != in SQL?

In standard SQL, <> is the not equal operator. Some databases also support != as an alternative.

Topic 6518 min readStructured Tutorial

SQL WHERE Clause - Comparison Operators

Quick Answer

The SQL WHERE clause uses comparison operators such as =, <, >, <=, >=, and <> to filter records based on specified conditions. These operators allow you to compare column values to constants or other columns, enabling precise data retrieval.

Learning Objectives

Understand the purpose and syntax of the SQL WHERE clause.
Learn how to use comparison operators to filter query results.
Apply different comparison operators in practical SQL queries.

Introduction

The SQL WHERE clause is essential for filtering data in queries.

Comparison operators allow you to specify conditions to select rows that meet certain criteria.

Filtering data effectively is key to powerful SQL queries.

Understanding the SQL WHERE Clause

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Author

RPATechnology Team

Last Updated

June 2026

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Operator	Meaning	Example
=	Equal to	WHERE age = 30
<>	Not equal to	WHERE status <> 'active'
<	Less than	WHERE price < 100
>	Greater than	WHERE quantity > 50
<=	Less than or equal to	WHERE score <= 75
>=	Greater than or equal to	WHERE rating >= 4

Learning Objectives

Introduction

Understanding the SQL WHERE Clause

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Recommended Next Topics

Logical Operators

BETWEEN Operator

IN Operator

LIKE Operator

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Comparison Operators in SQL

Examples of Using Comparison Operators

Example 1: Equal To Operator

Example 2: Greater Than Operator

Example 3: Not Equal To Operator

Practical Example

Examples

Best Practices

Common Mistakes

Hands-on Exercise

Filter Employees by Salary

Find Products Not in Stock

Retrieve Customers with Low Ratings

Interview Questions

What is the purpose of the SQL WHERE clause?

Name the common comparison operators used in SQL WHERE clauses.

How does the <> operator work in SQL?

MCQ Quiz

1. Which SQL comparison operator would you use to find all records where the price is exactly 100?

2. What is a common mistake when using comparison operators in the WHERE clause?

3. Which SQL comparison operator would you use in a WHERE clause to select rows where the column 'age' is exactly 30?

4. Which comparison operator would you use to include rows where a column's value is either equal to or greater than a certain number?

Key Takeaways

Frequently Asked Questions

Can I use multiple comparison operators in one WHERE clause?

What happens if I omit the WHERE clause in a SELECT statement?

Is the <> operator the same as != in SQL?

Summary

IS NULL

Combining Conditions

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