SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 4)
    Identifier product_name
    Identifier price
    Identifier group_name
    Function AVG (children 1)
     ExpressionList (children 1)
      Identifier price
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier products
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier product_groups
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier group_id
   ExpressionList (children 3)
    OrderByElement (children 1)
     Identifier group_name
    OrderByElement (children 1)
     Identifier product_name
    OrderByElement (children 1)
     Identifier price