QuerydrillCustomers who never ordered
An SQL exercise from Querydrill. Solve it with a SQL editor in your browser, checked on the rows it returns and again on changed data, and it is checked the moment you submit.
The task
Return the names of customers who have no orders at all.
What this exercise teaches
LEFT JOIN plus IS NULL on the right side is the standard way to find rows with no match.
A hint if you get stuck
LEFT JOIN keeps every customer. Customers with no match have NULL in the order columns.
This exercise is part of Pro
Pro unlocks all 60 exercises, with worked solutions and progress saved to your account. The free exercises work without an account.
You create a free account first, so Pro is attached to it.
Monthly is charged today and then every month until you cancel, in one click from your account page. Lifetime is one payment with no renewals. Full refund within 14 days of paying.