Find the department with the most employees?

Short answer: Find the department with the most employees var mostPopulated = employees .GroupBy(e => e.Department) .OrderByDescending(g => g.Count()) .FirstOrDefault(); Find the department with the most employees var mostPopulated = employees .GroupBy(e => e.Department) .OrderByDescending(g => g.Count()) .FirstOrDefault(); Real-world example… (ShopNest) ShopNest uses…… LINQ to query orders: filter by date, project to a summary…

Explain a bit more

DTO, and order by total—readable C# that becomes SQL under EF Core. Find the department with the most employees var mostPopulated = employees .GroupBy(e => e.Department) .OrderByDescending(g => g.Count()) .FirstOrDefault(); Find the department with the most employees var mostPopulated = employees .GroupBy(e => e.Department) .OrderByDescending(g => g.Count()) .FirstOrDefault(); Real-world example… (ShopNest) ShopNest uses LINQ to query orders: filter by date, project to a summary DTO, and order by total—readable C# that becomes SQL under EF Core.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.