/*
Table: ar_history_sum

Columns:
    card_no int
    charges dbms currency
    payments dbms currency
    balance dbms currency

Depends on:
    ar_history (table)

Use:
  Summary of all charges and payments per customer
  (One row per customer.)

*//* --COMMENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    * 24Oct2012 Eric Lee Add comments Depended on by:

*/