QuerydrillEmployee and manager
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 each employee's name and their manager's name. Employees without a manager show NULL.
What this exercise teaches
A self join treats one table as two, which is how hierarchies stored in one table are read.
A hint if you get stuck
Join the employees table to itself using two different aliases.
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.