我有一个包含这样数据的表
+-------------+--------------+------------+----------------+
| CustomerSID | StartDateSID | EndDateSID | MarketingOptIn |
+-------------+--------------+------------+----------------+
| 12345 | 20101019 | 20131016 | Y |
| 12345 | 20131017 | 20140413 | Y |
| 12345 | 20140414 | 20140817 | N |
| 12345 | 20140818 | 20141228 | N |
| 12345 | 20141229 | 20150125 | Y |
| 12345 | 20150126 | 0 | Y |
+-------------+--------------+------------+----------------+
我需要在这个表的顶部创建一个视图,使数据格式化为Flag的以下格式,基本上是Flag为Y或N的持续时间.(EndDateSID - 0当前是活动的,所以今天的日期)
+-------------+--------------+------------+----------------+
| CustomerSID | StartDateSID | EndDateSID | MarketingOptIn | …