QuerydrillNo 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 the names of employees who have no manager.
What this exercise teaches
= NULL is always unknown, so it filters out every row. IS NULL is the only correct test.
A hint if you get stuck
NULL is never equal to anything, not even NULL. Use IS NULL.
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