Add example scalar query.

EntityFrameworkCore.Console/Program.cs

@@ -16,7 +16,17 @@ context.Database.EnsureCreated();
 // Rather than raise: "System.InvalidOperationException: Sequence contains no elements."
 // var firstCoach = await context.Coaches.FirstOrDefaultAsync();
 
-await RawSQLStatement();
+
+
+async Task QueryScalarType()
+{
+  // Query a scalar or non-entity type.
+  // Scalar subqueries or scalar queries are queries that return exactly one column and one or zero records.
+  // Source: https://stackoverflow.com/questions/20424966/what-is-a-scalar-query
+  var leagueIds = context.Database.SqlQuery<int>(
+    $"SELECT Id FROM Leagues"
+  ).ToList();
+}
 
 async Task RawSQLStatement()
 {