Salary quartiles
Divide the employees with a recorded salary into four bands by pay, highest first. Return `name`, `salary` and `quartile`, ordered by quartile then name.
What a strong answer looks like
Say what the query is meant to return before you write it, and name the shape of the answer: how many rows, grouped by what. Then watch the NULLs and the duplicates, because that is where most of these are lost.
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0:00 of about 13 min
query.sql
Expected, in this order
| name | salary | quartile |
|---|---|---|
| Ada | 180000 | 1 |
| Grace | 165000 | 1 |
| Jean | 150000 | 2 |
| Linus | 140000 | 2 |
| Mel | 120000 | 3 |
| Kay | 120000 | 4 |
Your result
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