Npgsql.Tests.ReaderNewSchemaTests.IsKeyComposite C# (CSharp) Method

        public void IsKeyComposite()
        {
            using (var conn = OpenConnection())
            {
                conn.ExecuteNonQuery("CREATE TEMP TABLE data (id1 INT, id2 INT, PRIMARY KEY (id1, id2))");

                using (var cmd = new NpgsqlCommand("SELECT id1,id2 FROM data", conn))
                using (var reader = cmd.ExecuteReader(CommandBehavior.SchemaOnly | CommandBehavior.KeyInfo))
                {
                    var columns = reader.GetColumnSchema();
                    Assert.That(columns[0].IsKey, Is.True);
                    Assert.That(columns[1].IsKey, Is.True);
                }
            }
        }