Wikimedia Foundation Interview Questions

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Wikimedia Foundation Interview Questions

Practice for the Wikimedia Foundation interview with these recently asked interview questions.

QuestionTopicDifficulty
SQL
Medium

Given the employees and departments table, write a query to get the top 3 highest employee salaries by department. If the department contains less that 3 employees, the top 2 or the top 1 highest salaries should be listed (assume that each department has at least 1 employee). 

Note: The output should include the full name of the employee in one column, the department name, and the salary. The output should be sorted by department name in ascending order and salary in descending order. 

Example:

Input:

employees table

Column Type
id INTEGER
first_name VARCHAR
last_name VARCHAR
salary INTEGER
department_id INTEGER

departments table

Column Type
id INTEGER
name VARCHAR

Output:

Column Type
employee_name VARCHAR
department_name VARCHAR
salary INTEGER
A/B Testing
Medium
SQL
Hard
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Wikimedia Foundation Salaries by Position

Software Engineer*
$155K
Software Engineer
Median: $155K
Mean (Average): $155K
Data points: 1
Data Analyst*
$101K
Data Analyst
Median: $101K
Mean (Average): $101K
Data points: 1

Most data science positions fall under different position titles depending on the actual role.

From the graph we can see that on average the Software Engineer role pays the most with a $155,000 base salary while the Data Analyst role on average pays the least with a $100,506 base salary.

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