Replace missing values

Return name and email, replacing NULL email with Unknown, ordered by id.

Try it yourself

Open a fresh temporary sample shop dataset. Write your query and use Check answer. Checking uses a separate, clean sample so edits to your workspace cannot change the expected answer. Matches are based on this dataset, not a proof for every possible database.

Sample schema

customers(id, name, email, country, joined_at)
products(id, name, category, price)
orders(id, customer_id, ordered_at, status, total)
order_items(id, order_id, product_id, quantity, unit_price)

About this dataset · Learning paths · SQL reference

SELECT name, COALESCE(email, 'Unknown') FROM customers ORDER BY id;

Keep practicing

Match part of a name → · All exercises