Team Size | Advanced SQL Interview Questions | Data Engineer Interview Question | FAANG Interview
Video 373: This is the 42nd video of the SQL Interview Question series.
00:00 - Introduction to dataset and Question
02:35 - Approach 1: Using CTE (Common Table Expression)
06:00 - Approach 2: Using a Subquery
06:50 - Approach 3: Using Window Functions
09:15 - Conclusion
We are given Employee table which has the Employee id and the team they are in. We are asking us to find the total employees in each department and show it across all the employee id
In this video, we explore three different SQL techniques to solve the problem of finding the team size for each employee.
** Approach 1: Using CTE (Common Table Expression) **
We start by using a CTE to group employees by their team and calculate the team size. This approach emphasizes the readability and modular nature of CTEs, making it easier to manage more complex queries.
** Approach 2: Using a Subquery **
In this method, we utilize a subquery within the main query to achieve the same goal. This approach is slightly different in structure but returns the same result, demonstrating how subqueries can be leveraged for efficient query design.
** Approach 3: Using Window Functions **
Finally, we explore the use of window functions, which allow us to compute the team size directly while retrieving the employee data. This approach is particularly efficient when you want to avoid using joins or additional subqueries.
For a comprehensive understanding of these SQL methodologies and their application, please refer to this explanatory video.
code: https://github.com/jeganpillai/adv_sq...
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