电子商务网站优惠券问题
现在有个网站会员有个优惠券功能
注册送优惠券（有效期一年）
够买东西返还优惠券（有效期不限）
节假日送优惠券（具体时间金额啥的后台人员定义）
我的做法是这样的
member 表名
userid 会员ID字段
yhq 是优惠券字段（存放优惠券金额总和）
把优惠券曾送时间，到期时间，说明单独放到一个表里，
表名是yhq
id 优惠券ID字段
userid 会员ID字段
title 优惠券标题
start_time 曾送时间
end_time 到期时间
price 金额
但是现在有个问题就是到期问题
假如现在有个会员今天注册了，送个20元优惠券，明天买东西花掉10元，还剩10元
过几天会员没有事发发帖子又赚了20元优惠券
一年后按要求应该要扣掉10元的，但是程序不知道啊。
求高手帮忙解决一下
或者你们做优惠券有没有碰到这样的问题。是怎么解决的谢谢。
------解决方案--------------------
那你到底是原来的1年后过期呢还是后来赠送的都一起过期？还是原来的10元过期，后来的也需要累计到一年的时间后过期？
如果是后面的 我觉得你就应该要分开来设计表 将优惠卷单独用个表来记录 就简单解决了
------解决方案--------------------
好像没有问题啊，另外从应用上来讲，每张优惠劵不能拆开使用的吧，只能一次性使用的好像
------解决方案--------------------
一张优惠券应该只能使用一次做限制。
比如你去商场购物 有100优惠券，应该不存在用了50 还剩下50的情况。
------解决方案--------------------
1. 优惠券不应该有总和的概念，专门做个表存用户的所有优惠券吧。
2. 优惠券都是一次性消费的
3. 然后。。。就没有然后了
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