Get total salary by department?

Short answer: Get total salary by department var totalByDept = employees .GroupBy(e => e.Department) .Select(g => new { Department = g.Key, Total = g.Sum(e => e.Salary) }); Get total salary by department var totalByDept = employees .GroupBy(e => e.Department) .Select(g => new { Department = g.Key, Total = g.Sum(e => e.Salary) }); Real-world… example (ShopNest) ShopNest…… uses LINQ to query orders: filter by date, project to a…

Explain a bit more

summary DTO, and order by total—readable C# that becomes SQL under EF Core. Get total salary by department var totalByDept = employees .GroupBy(e => e.Department) .Select(g => new { Department = g.Key, Total = g.Sum(e => e.Salary) }); Get total salary by department var totalByDept = employees .GroupBy(e => e.Department) .Select(g => new { Department = g.Key, Total = g.Sum(e => e.Salary) }); 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.