Group by two columns — practice · DataDesk

Aggregates & GROUP BY(8 / 20)

Intermediate

Group by two columns

For each dept_id and gender combination (employees with a department only), show headcount.

Tables

departments

dept_idinteger
dept_namevarchar
locationvarchar

emp_projects

emp_idinteger
project_idinteger
rolevarchar
hours_per_weekinteger

employees

emp_idinteger
first_namevarchar
last_namevarchar
emailvarchar
dept_idinteger
manager_idinteger
job_titlevarchar
salaryinteger
hire_datedate
cityvarchar
gendervarchar

projects

project_idinteger
project_namevarchar
dept_idinteger
budgetinteger
start_datedate
end_datedate

Expected output

10 rows with columns dept_id, gender, headcount — first 3 shown:

#
1	1	F	4
2	1	M	3
3	2	F	2

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Solution

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SQL (DuckDB)

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