SQL Practice Ground

Practice your SQL skills with different difficulty levels

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Timed Challenge

Question

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Database Info

Database Schema

Table structures and relationships

customers(1/4)

customers

Column	Type
id	INTEGER
first_name	VARCHAR(50)
last_name	VARCHAR(50)
email	VARCHAR(100)
registration_date	DATE

Relationships:

• orders.customer_id → customers.id
• order_items.order_id → orders.id
• order_items.product_id → products.id

SQL Editor

SELECT * FROM customers;



-- Welcome to the SQL Practice Ground!
--
-- 1. Read the question on the left.
-- 2. Check "Database Info" below for schema & sample data.
-- 3. Write your SQL query in this editor.
-- 4. Click "Run" to see the results.
-- 5. Use "Prev" & "Next" to switch exercises.
-- 6. Stuck? Use the "Hint" and "Solution" buttons.
-- 7. Feeling brave? Try the "Timed Challenge" mode!
--
-- Good luck!

SELECT * FROM customers;



-- Welcome to the SQL Practice Ground!
--
-- 1. Read the question on the left.
-- 2. Check "Database Info" below for schema & sample data.
-- 3. Write your SQL query in this editor.
-- 4. Click "Run" to see the results.
-- 5. Use "Prev" & "Next" to switch exercises.
-- 6. Stuck? Use the "Hint" and "Solution" buttons.
-- 7. Feeling brave? Try the "Timed Challenge" mode!
--
-- Good luck!

Results

Run a query to see results