Add custom SQL to create a view for Teams and Leagues with migration.

Also state that this view is keyless.

EntityFrameworkCore.Console/Program.cs

@@ -15,6 +15,8 @@ context.Database.EnsureCreated();
 // Rather than raise: "System.InvalidOperationException: Sequence contains no elements."
 // var firstCoach = await context.Coaches.FirstOrDefaultAsync();
 
+var details = await context.TeamsAndLeaguesView.ToListAsync();
+
 async Task ProjectionAndAnonymousDataTypes()
 {
   var teams = await context.Teams

EntityFrameworkCore.Data/DeadBallZoneLeagueDbContext.cs

@@ -20,6 +20,7 @@ public class DeadBallZoneLeagueDbContext : DbContext
   public DbSet<Coach> Coaches { get; set; }
   public DbSet<League> Leagues { get; set; }
   public DbSet<Match> Matches { get; set; }
+  public DbSet<TeamsAndLeaguesView> TeamsAndLeaguesView { get; set; }
 
   protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
   {
@@ -37,5 +38,8 @@ public class DeadBallZoneLeagueDbContext : DbContext
 
     // This line can be used, then individual configurations do not need to be loaded.
     modelBuilder.ApplyConfigurationsFromAssembly(Assembly.GetExecutingAssembly());
+
+    // This database object does not have a Primary Key, so we state that here, otherwise an exception is thrown.
+    modelBuilder.Entity<TeamsAndLeaguesView>().HasNoKey().ToView("vw_TeamsAndLeagues");
   }
 }

EntityFrameworkCore.Data/Migrations/20250407174459_AddTeamLeaguesAndCoachesView.Designer.cs

@@ -0,0 +1,490 @@
+// <auto-generated />
+using System;
+using EntityFrameworkCore.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace EntityFrameworkCore.Data.Migrations
+{
+    [DbContext(typeof(DeadBallZoneLeagueDbContext))]
+    [Migration("20250407174459_AddTeamLeaguesAndCoachesView")]
+    partial class AddTeamLeaguesAndCoachesView
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder.HasAnnotation("ProductVersion", "9.0.3");
+
+            modelBuilder.Entity("EntityFrameworkCore.Domain.Coach", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("CreatedBy")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("CreatedDate")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("ModifiedBy")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("ModifiedDate")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Coaches");
+
+                    b.HasData(
+                        new
+                        {
+                            Id = 1,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Christian Southgate"
+                        },
+                        new
+                        {
+                            Id = 2,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Rob Mann"
+                        },
+                        new
+                        {
+                            Id = 3,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Jon Curtis"
+                        },
+                        new
+                        {
+                            Id = 4,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Andy Taylor"
+                        },
+                        new
+                        {
+                            Id = 5,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Steve Johnson"
+                        },
+                        new
+                        {
+                            Id = 6,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Dan Cook"
+                        },
+                        new
+                        {
+                            Id = 7,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Ken Jarvis"
+                        },
+                        new
+                        {
+                            Id = 8,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Kenny Suzuki"
+                        },
+                        new
+                        {
+                            Id = 9,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Gordon Hall"
+                        },
+                        new
+                        {
+                            Id = 10,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "John O Dowd"
+                        },
+                        new
+                        {
+                            Id = 11,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Julian Widdows"
+                        },
+                        new
+                        {
+                            Id = 12,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Andy Williams"
+                        },
+                        new
+                        {
+                            Id = 13,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Trevor Williams"
+                        },
+                        new
+                        {
+                            Id = 14,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Blake Deathray"
+                        },
+                        new
+                        {
+                            Id = 15,
+                            CreatedDate = new DateTime(2025, 4, 7, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Rock Housebrick"
+                        });
+                });
+
+            modelBuilder.Entity("EntityFrameworkCore.Domain.League", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("CreatedBy")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("CreatedDate")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("ModifiedBy")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("ModifiedDate")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Leagues");
+
+                    b.HasData(
+                        new
+                        {
+                            Id = 1,
+                            CreatedDate = new DateTime(2025, 4, 6, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Local League"
+                        },
+                        new
+                        {
+                            Id = 2,
+                            CreatedDate = new DateTime(2025, 4, 6, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "National League"
+                        },
+                        new
+                        {
+                            Id = 3,
+                            CreatedDate = new DateTime(2025, 4, 6, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Geosphere"
+                        },
+                        new
+                        {
+                            Id = 4,
+                            CreatedDate = new DateTime(2025, 4, 6, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Cyber war"
+                        });
+                });
+
+            modelBuilder.Entity("EntityFrameworkCore.Domain.Match", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("AwayTeamId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("AwayTeamScore")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("CreatedBy")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("CreatedDate")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("Date")
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("HomeTeamId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("HomeTeamScore")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("ModifiedBy")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("ModifiedDate")
+                        .HasColumnType("TEXT");
+
+                    b.Property<decimal>("TicketPrice")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("AwayTeamId");
+
+                    b.HasIndex("HomeTeamId");
+
+                    b.ToTable("Matches");
+                });
+
+            modelBuilder.Entity("EntityFrameworkCore.Domain.Team", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("CoachId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("CreatedBy")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("CreatedDate")
+                        .HasColumnType("TEXT");
+
+                    b.Property<int?>("LeagueId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("ModifiedBy")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("ModifiedDate")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CoachId")
+                        .IsUnique();
+
+                    b.HasIndex("LeagueId");
+
+                    b.HasIndex("Name")
+                        .IsUnique();
+
+                    b.ToTable("Teams");
+
+                    b.HasData(
+                        new
+                        {
+                            Id = 1,
+                            CoachId = 1,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 2,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Neo Delhi"
+                        },
+                        new
+                        {
+                            Id = 2,
+                            CoachId = 2,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 1,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Voodoo"
+                        },
+                        new
+                        {
+                            Id = 3,
+                            CoachId = 3,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 1,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Penal X"
+                        },
+                        new
+                        {
+                            Id = 4,
+                            CoachId = 4,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 3,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Neo Tokyo"
+                        },
+                        new
+                        {
+                            Id = 5,
+                            CoachId = 5,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 2,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Neo Barcelona"
+                        },
+                        new
+                        {
+                            Id = 6,
+                            CoachId = 6,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 2,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Neo Manchester"
+                        },
+                        new
+                        {
+                            Id = 7,
+                            CoachId = 7,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 3,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Neo Bangkok"
+                        },
+                        new
+                        {
+                            Id = 8,
+                            CoachId = 8,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 3,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Neo Amsterdam"
+                        },
+                        new
+                        {
+                            Id = 9,
+                            CoachId = 9,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 1,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Killaklowns"
+                        },
+                        new
+                        {
+                            Id = 10,
+                            CoachId = 10,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 1,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Sol"
+                        },
+                        new
+                        {
+                            Id = 11,
+                            CoachId = 11,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 4,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "DEC"
+                        },
+                        new
+                        {
+                            Id = 12,
+                            CoachId = 12,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 1,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Leopards"
+                        },
+                        new
+                        {
+                            Id = 13,
+                            CoachId = 13,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 1,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Harlequins"
+                        },
+                        new
+                        {
+                            Id = 14,
+                            CoachId = 14,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 4,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Gladiators"
+                        },
+                        new
+                        {
+                            Id = 15,
+                            CoachId = 15,
+                            CreatedDate = new DateTime(2025, 4, 4, 17, 7, 27, 33, DateTimeKind.Unspecified),
+                            LeagueId = 1,
+                            ModifiedDate = new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified),
+                            Name = "Fiz-O"
+                        });
+                });
+
+            modelBuilder.Entity("EntityFrameworkCore.Domain.Match", b =>
+                {
+                    b.HasOne("EntityFrameworkCore.Domain.Team", "AwayTeam")
+                        .WithMany("AwayMatches")
+                        .HasForeignKey("AwayTeamId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("EntityFrameworkCore.Domain.Team", "HomeTeam")
+                        .WithMany("HomeMatches")
+                        .HasForeignKey("HomeTeamId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("AwayTeam");
+
+                    b.Navigation("HomeTeam");
+                });
+
+            modelBuilder.Entity("EntityFrameworkCore.Domain.Team", b =>
+                {
+                    b.HasOne("EntityFrameworkCore.Domain.Coach", "Coach")
+                        .WithOne("Team")
+                        .HasForeignKey("EntityFrameworkCore.Domain.Team", "CoachId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("EntityFrameworkCore.Domain.League", "League")
+                        .WithMany("Teams")
+                        .HasForeignKey("LeagueId");
+
+                    b.Navigation("Coach");
+
+                    b.Navigation("League");
+                });
+
+            modelBuilder.Entity("EntityFrameworkCore.Domain.Coach", b =>
+                {
+                    b.Navigation("Team");
+                });
+
+            modelBuilder.Entity("EntityFrameworkCore.Domain.League", b =>
+                {
+                    b.Navigation("Teams");
+                });
+
+            modelBuilder.Entity("EntityFrameworkCore.Domain.Team", b =>
+                {
+                    b.Navigation("AwayMatches");
+
+                    b.Navigation("HomeMatches");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

EntityFrameworkCore.Data/Migrations/20250407174459_AddTeamLeaguesAndCoachesView.cs

@@ -0,0 +1,32 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace EntityFrameworkCore.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddTeamLeaguesAndCoachesView : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            // I added this SQL manually, by first creating an empty migration.
+            // A view is a read-only representation of a data set.
+            migrationBuilder.Sql(@"
+                CREATE VIEW vw_TeamsAndLeagues
+                AS
+                SELECT t.name, l.Name AS LeagueName
+                FROM Teams AS t
+                LEFT JOIN Leagues AS l ON t.LeagueId = l.Id
+            ");
+
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            // Don't forget this part as well, for each manually added SQL statement.
+            migrationBuilder.Sql(@"DROP VIEW vw_TeamsAndLeagues");
+        }
+    }
+}

EntityFrameworkCore.Domain/TeamsAndLeaguesView.cs

@@ -0,0 +1,7 @@
+namespace EntityFrameworkCore.Domain;
+
+public class TeamsAndLeaguesView
+{
+  public string? Name { get; set; }
+  public string? LeagueName { get; set; }
+}