回复：简单点儿就是：同一个时间段的数据现在从数据库里调，

1. data got modified -- i.e. accounting, month/quarter/year-end ajustments, or order has been cancelled/refunded;
2. data input was inconsistency, account consolidation issue(s);
3. what's the step(s) for reconciliation?
4. book/act closing date requirements in place?

it seemed that you are doing business data reporting?