SQL LIMIT Statement

last modified February 25, 2025

The SQL LIMIT statement is used to restrict the number of rows returned by a query. It is particularly useful when working with large datasets and you only need a subset of the results. This tutorial covers how to use the LIMIT statement with practical examples.

The LIMIT clause is often used in combination with the ORDER BY clause to retrieve the top or bottom records based on a specific column.

Setting Up the Database

First, let's create the books table and insert sample data.

-- Create the books table
CREATE TABLE books (
 book_id INTEGER PRIMARY KEY,
 title VARCHAR(100) NOT NULL,
 author VARCHAR(100) NOT NULL,
 genre VARCHAR(50) NOT NULL,
 price NUMERIC(5,2) NOT NULL CHECK (price>= 0),
 publication_year INTEGER NOT NULL CHECK (publication_year BETWEEN 1900 AND 2025)
);
-- Insert 30 sample book entries
INSERT INTO books (book_id, title, author, genre, price, publication_year) VALUES
(101, 'The Silent Forest', 'Jane Doe', 'Mystery', 12.99, 2020),
(102, 'Code of Tomorrow', 'John Smith', 'Sci-Fi', 15.50, 2022),
(103, 'Cooking Basics', 'Maria Lopez', 'Non-Fiction', 9.99, 2019),
(104, 'Whispers in the Dark', 'Emily Carter', 'Horror', 13.75, 2021),
(105, 'The Last Empire', 'Robert King', 'Fantasy', 18.99, 2018),
(106, 'Data Driven', 'Alex Chen', 'Non-Fiction', 22.00, 2023),
(107, 'Echoes of Time', 'Sarah Miles', 'Sci-Fi', 14.25, 2020),
(108, 'The Red Shadow', 'Tom Harris', 'Thriller', 11.50, 2017),
(109, 'Garden of Dreams', 'Lily Evans', 'Romance', 8.99, 2022),
(110, 'Quantum Leap', 'David Patel', 'Sci-Fi', 16.80, 2024),
(111, 'Broken Chains', 'Anna Reed', 'Historical', 17.45, 2015),
(112, 'The Hungry Flame', 'Mark Stone', 'Fantasy', 19.99, 2021),
(113, 'Simple Joys', 'Clara White', 'Self-Help', 10.25, 2019),
(114, 'Nightmare City', 'Greg Holt', 'Horror', 12.60, 2023),
(115, 'Love in Bloom', 'Sophie Bell', 'Romance', 7.99, 2020),
(116, 'The Codebreaker', 'James Fox', 'Thriller', 14.99, 2018),
(117, 'Stars Unseen', 'Rachel Kim', 'Sci-Fi', 15.75, 2022),
(118, 'The Lost Recipe', 'Elena Ortiz', 'Non-Fiction', 11.20, 2016),
(119, 'Winds of Fate', 'Henry Blake', 'Fantasy', 20.50, 2023),
(120, 'Silent Witness', 'Laura Dean', 'Mystery', 13.30, 2019),
(121, 'Beyond the Veil', 'Chris Ward', 'Horror', 14.00, 2021),
(122, 'The Art of Calm', 'Nina Patel', 'Self-Help', 9.50, 2020),
(123, 'Empire of Dust', 'Oliver Grant', 'Historical', 18.25, 2014),
(124, 'Twist of Trust', 'Kate Lynn', 'Thriller', 12.85, 2022),
(125, 'Heartstrings', 'Emma Rose', 'Romance', 8.75, 2023),
(126, 'The Infinite Loop', 'Sam Carter', 'Sci-Fi', 16.99, 2024),
(127, 'Bread & Soul', 'Luis Gomez', 'Non-Fiction', 10.85, 2018),
(128, 'Dragon's Breath', 'Tara Hill', 'Fantasy', 21.00, 2020),
(129, 'The Locked Door', 'Peter Shaw', 'Mystery', 11.95, 2021),
(130, 'Mind Over Matter', 'Vikram Singh', 'Self-Help', 13.50, 2022);

The books table is created with columns for book_id, title, author, genre, price, and publication_year. Constraints like PRIMARY KEY, NOT NULL, and CHECK ensure data integrity.

Basic Usage of LIMIT

This example demonstrates how to retrieve the first 5 books from the books table.

SELECT * FROM books
LIMIT 5;

The LIMIT 5 clause restricts the query to return only the first 5 rows from the table.

LIMIT with ORDER BY

This example retrieves the 5 most expensive books:

SELECT * FROM books
ORDER BY price DESC
LIMIT 5;

The ORDER BY price DESC clause sorts the books by price in descending order, and LIMIT 5 returns the top 5 results.

LIMIT with OFFSET

This example retrieves the next 5 books after the first 5:

SELECT * FROM books
LIMIT 5 OFFSET 5;

The OFFSET 5 clause skips the first 5 rows, and LIMIT 5 returns the next 5 rows.

LIMIT with WHERE

This example retrieves the first 3 books in the "Sci-Fi" genre:

SELECT * FROM books
WHERE genre = 'Sci-Fi'
LIMIT 3;

The WHERE clause filters the results by genre, and LIMIT 3 returns the first 3 matching rows.

LIMIT with Aggregation

This example retrieves the top 3 genres with the most books:

SELECT genre, COUNT(*) AS book_count
FROM books
GROUP BY genre
ORDER BY book_count DESC
LIMIT 3;

The GROUP BY clause groups the results by genre, and LIMIT 3 returns the top 3 genres with the most books.

LIMIT with JOIN

This example retrieves the first 5 books along with their authors:

SELECT books.title, books.author
FROM books
JOIN authors ON books.author_id = authors.id
LIMIT 5;

The JOIN clause combines data from the books and authors tables, and LIMIT 5 returns the first 5 rows.

LIMIT with Subquery

This example retrieves the top 3 most expensive books:

SELECT * FROM (
 SELECT * FROM books
 ORDER BY price DESC
) AS top_books
LIMIT 3;

The subquery sorts the books by price in descending order, and the outer query uses LIMIT 3 to return the top 3 results.

LIMIT with DISTINCT

This example retrieves the first 5 unique authors:

SELECT DISTINCT author
FROM books
LIMIT 5;

The DISTINCT clause ensures that only unique authors are returned, and LIMIT 5 restricts the results to the first 5 unique authors.

LIMIT with UNION

This example retrieves the first 5 books from two different tables:

SELECT title, author FROM books
UNION
SELECT title, author FROM old_books
LIMIT 5;

The UNION clause combines results from two tables, and LIMIT 5 returns the first 5 rows from the combined results.

LIMIT with Window Functions

This example retrieves the top 3 books in each genre based on price:

SELECT * FROM (
 SELECT *, ROW_NUMBER() OVER (PARTITION BY genre ORDER BY price DESC) AS rank
 FROM books
) AS ranked_books
WHERE rank <= 3; 

The ROW_NUMBER() window function ranks books within each genre by price, and the outer query filters to return only the top 3 books in each genre.

Best Practices for Using LIMIT

• Use with ORDER BY: Always use LIMIT with ORDER BY to ensure predictable results.
• Combine with OFFSET: Use OFFSET to paginate results when working with large datasets.
• Optimize Performance: Use LIMIT to reduce the amount of data processed and improve query performance.
• Test with Subqueries: Use subqueries to apply LIMIT to intermediate results when needed.

Source

PostgreSQL Documentation

In this article, we have explored how to use the SQL LIMIT statement to restrict query results, with practical examples and best practices.

Author

My name is Jan Bodnar, and I am a passionate programmer with extensive programming experience. I have been writing programming articles since 2007. To date, I have authored over 1,400 articles and 8 e-books. I possess more than ten years of experience in teaching programming.