finished homework

lambda_practice/Program.cs

@@ -1,6 +1,7 @@
 using lambda_practice.data;
 using Microsoft.EntityFrameworkCore;
 using System;
+using System.Linq;
 
 namespace lambda_practice
 {
@@ -22,25 +23,53 @@ static void Main(string[] args)
             using (var context = new DatabaseContext(options))
             {
                 //You can erase the following 3 lines if needed
-                context.Cities.ForEachAsync(c => Console.WriteLine(c.Name));
-                context.Departments.ForEachAsync(d => Console.WriteLine(d.Name));
-                context.Employees.ForEachAsync(e => Console.WriteLine($"{e.FirstName} {e.LastName}"));
+                //context.Cities.ForEachAsync(c => Console.WriteLine(c.Name));
+                //context.Departments.ForEachAsync(d => Console.WriteLine(d.Name));
+                //context.Employees.ForEachAsync(e => Console.WriteLine($"{e.FirstName} {e.LastName}"));
 
                 //1. List all employees whose departament has an office in Chihuahua
+                var query = context.Employees.Where(e => e.Department.Cities.Where(c => c.Name == "Chihuahua").Count() > 0);
+
+                Console.WriteLine("List all employees whose departament has an office in Chihuahua\n\n");
+
+                query.ForEachAsync(e => Console.WriteLine($"{e.FirstName} {e.LastName}"));
 
 
                 //2. List all departaments and the number of employees that belong to each department.
+                var secondQuery = context.Departments.Select(d => new {
+                    Name = d.Name,
+                    Count = context.Employees.Where(e => e.Department == d).Count()
+                });
+
+                Console.WriteLine("\n\n2. List all departaments and the number of employees that belong to each department.\n\n");
+
+                secondQuery.ForEachAsync(d => Console.WriteLine($"{d.Name} {d.Count}"));
 
 
                 //3. List all remote employees. That is all employees whose living city is not the same one as their department's.
+                var thirdQuery = context.Employees.Where(e => e.Department.Cities.Where(c => c.Name == e.City.Name).Count() == 0);
+
+                Console.WriteLine("\n\n3. List all remote employees. That is all employees whose living city is not the same one as their department's.\n\n");
+
+                thirdQuery.ForEachAsync(e => Console.WriteLine($"{e.FirstName} {e.LastName}"));
 
 
                 //4. List all employees whose hire aniversary is next month.
+                var fourthQuery = context.Employees.Where(e => e.HireDate.Month == DateTime.Now.AddMonths(1).Month);
+                Console.WriteLine("\n\n4. List all employees whose hire aniversary is next month.\n\n");
+
+                fourthQuery.ForEachAsync(e => Console.WriteLine($"{e.FirstName} {e.LastName}"));
 
 
                 //5. List all 12 months of the year and the number of employees hired on each month.
+                var fifthQuery = context.Employees.GroupBy(e => e.HireDate.Month);
+
+                Console.WriteLine("\n\n5. List all 12 months of the year and the number of employees hired on each month.\n\n");
+
+                fifthQuery.ForEachAsync(m => Console.WriteLine($"{System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(m.Key)}: {m.Count()}"));
             }
 
+            Console.WriteLine("\nDone.");
             Console.ReadLine();
         }
     }