SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function sum (children 1)
     ExpressionList (children 1)
      Function plus (children 1)
       ExpressionList (children 2)
        Identifier b.ID
        Identifier m.key
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier m
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier b
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier m.key
        Identifier b.key
   ExpressionList (children 1)
    Identifier key
