public TableSelectExpression()
 {
     Columns           = new List <SelectColumn>();
     CompositeFunction = CompositeFunction.None;
     Into    = new SelectIntoClause();
     From    = new FromClause();
     GroupBy = new List <ByColumn>();
 }
 public TableSelectExpression()
 {
     Columns = new List<SelectColumn>();
     CompositeFunction = CompositeFunction.None;
     Into = new SelectIntoClause();
     From = new FromClause();
     GroupBy = new List<ByColumn>();
 }