Distinct count per group — practice · DataDesk

Aggregates & GROUP BY(11 / 20)

Intermediate

Distinct count per group

For each project_id in emp_projects, count how many different employees work on it, as team_size.

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

8 rows with columns project_id, team_size — first 3 shown:

#
1	101	3
2	102	4
3	103	3

Hints(0/2)

Solution

Unlocks after you solve it or after 3 submissions

SQL (DuckDB)

Ctrl + Enter to runLog in to save progress and earn XP

Run your code to see the output here.