public void ExceptTest()
{
SqlSelect s1 = SqlDml.Select(SqlDml.TableRef(Catalog.Schemas["main"].Tables["track"]));
s1.Columns.Add(SqlDml.Asterisk);
SqlSelect s2 = SqlDml.Select(SqlDml.TableRef(Catalog.Schemas["main"].Tables["track"]));
s2.Columns.Add(SqlDml.Asterisk);
SqlSelect s3 = SqlDml.Select(SqlDml.TableRef(Catalog.Schemas["main"].Tables["track"]));
s3.Columns.Add(SqlDml.Asterisk);
Console.WriteLine(sqlDriver.Compile(s1.Except(s2)).GetCommandText());
Console.WriteLine(sqlDriver.Compile(s1.Except(s2).Except(s3)).GetCommandText());
Console.WriteLine(sqlDriver.Compile(s1.Except(s2.Except(s3))).GetCommandText());
Console.WriteLine(sqlDriver.Compile(SqlDml.Except(s1, s2)).GetCommandText());
Console.WriteLine(sqlDriver.Compile(SqlDml.Except(s1, s1.Except(s2))).GetCommandText());
Console.WriteLine(sqlDriver.Compile(SqlDml.Except(s1.Except(s2), s1)).GetCommandText());
Console.WriteLine(sqlDriver.Compile(SqlDml.Except(s1.Except(s2), s1.Except(s2))).GetCommandText());
}