QuerydrillHires per year
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 hire year (like 2021) and how many employees were hired that year. strftime('%Y', hire_date) gives the year.
What this exercise teaches
Date parts are the most common derived grouping keys.
A hint if you get stuck
Group by the year expression and count.
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