Group by one column — practice · DataDesk

Aggregates & GROUP BY(5 / 20)

Basic

Group by one column

For each city, show the number of employees as employees.

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

7 rows with columns city, employees — first 3 shown:

#
1	Bengaluru	5
2	Pune	3
3	Mumbai	4

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Solution

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SQL (DuckDB)

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