Pokaż, ile zamówień obsłużył każdy z pracowników.
Baza: Northwind, Tabele: dbo.Employees, dbo.Orders, Kolumny: EmployeeID, FirstName, LastName, Title, OrderID, Wynik: 9 rows
[spoiler title=’Rozwiązanie’ collapse_link=’true’]SELECT E.EmployeeID, E.FirstName, E.LastName, E.Title, COUNT(O.OrderID) as Orders FROM dbo.Employees as E JOIN dbo.Orders as O on E.EmployeeID = O.EmployeeID GROUP BY E.EmployeeID, E.FirstName, E.LastName, E.Title
ORDER BY Orders DESC;
[/spoiler]