Most Common SQL Commands Every Developer Should Know

SQL (Structured Query Language) is the foundation of working with databases. Whether you're a backend developer, full-stack engineer, or data analyst — knowing how to write SQL queries is a must-have skill.

In this post, we’ll go over the most commonly used SQL commands that every developer should know with examples. Let’s get started!

1. SELECT – Retrieve Data

This is the most basic and widely used SQL command.

SELECT * FROM users;

Retrieve all columns from the users table.

2. INSERT INTO – Add Data

INSERT INTO users (name, email) VALUES ('John Doe', 'john@example.com');

Adds a new record to the users table.

3. UPDATE – Modify Existing Records

UPDATE users SET name = 'Jane Doe' WHERE id = 1;

Updates the name of the user whose ID is 1.

4. DELETE – Remove Records

DELETE FROM users WHERE id = 2;

Deletes the user with ID 2 from the table.

5. WHERE – Filter Results

SELECT * FROM users WHERE email LIKE '%@gmail.com';

Only retrieves users with Gmail addresses.

6. ORDER BY – Sort Results

SELECT * FROM users ORDER BY created_at DESC;

Sort users by most recently created.

7. LIMIT – Restrict Rows Returned

SELECT * FROM users LIMIT 10;

Shows only the first 10 records.

8. JOIN – Combine Tables

SELECT users.name, orders.amount 
FROM users 
JOIN orders ON users.id = orders.user_id;

Combines user and order data based on matching IDs.

9. GROUP BY – Aggregate Results

SELECT country, COUNT(*) FROM users GROUP BY country;

Shows user count by country.

10. CREATE TABLE – Define New Table

CREATE TABLE users (
  id INT PRIMARY KEY,
  name VARCHAR(100),
  email VARCHAR(100),
  created_at TIMESTAMP
);

✅ Conclusion

These 10 SQL commands are essential for most real-world web development and data projects. Mastering these will make you more confident when working with relational databases like MySQL, PostgreSQL, or SQLite.

Want a handy printable version? A PDF cheat sheet is coming soon — stay tuned!