LeetCode 1077: Project Employees III Solution
Master LeetCode problem 1077 (Project Employees III), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
1077. Project Employees III
Problem Explanation
Explanation
To solve this problem, we need to find the total number of employees who have worked on each project. We can achieve this by using a SQL query with a group by clause on the project_id column and then summing up the distinct employee_id for each project.
- Write a SQL query to group by project_id and count the distinct employee_id for each project.
- Return the result as the output.
Time complexity: O(n), where n is the number of rows in the table. Space complexity: O(n)
Solution Code
# Write your Java solution here
SELECT project_id, COUNT(DISTINCT employee_id) AS number_of_employees
FROM Project
GROUP BY project_idTry It Yourself
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