从SQL中的开始日期列表中获取结束日期

Question

I have a sql query that brings back a list of references (products) that were at a specific status and an effective date. Unfortunately when one product moves to a different status the system doesn't put an end date in, so I am wanting to generate the end date, based on the effective date and sequence number. Is this possible?

Product  Status  EffectiveDate          Enddate SeqNo
10      *UC     2017-10-02 00:00:00.000 NULL    8590
584     UC      2017-02-28 00:00:00.000 NULL    8380
584     APA     2017-07-07 00:00:00.000 NULL    8620
584     APA3    2017-08-10 00:00:00.000 NULL    8630
902     *UC     2017-10-13 00:00:00.000 NULL    8590
902     APA     2017-10-13 00:00:00.000 NULL    8620
1017    *UC     2017-09-01 00:00:00.000 NULL    8590
1017    APA     2017-10-10 00:00:00.000 NULL    8620

SO I would want to return the following...

Product  Status  EffectiveDate          EndDate                     SeqNo
10      *UC     2017-10-02 00:00:00.000 NULL                        8590
584     UC      2017-02-28 00:00:00.000 2017-07-07 00:00:00.000     8380
584     APA     2017-07-07 00:00:00.000 2017-08-10 00:00:00.000     8620
584     APA3    2017-08-10 00:00:00.000 NULL                        8630
902     *UC     2017-10-13 00:00:00.000 2017-10-13 00:00:00.000     8590
902     APA     2017-10-13 00:00:00.000 NULL                        8620
1017    *UC     2017-09-01 00:00:00.000 2017-10-10 00:00:00.000     8590
1017    APA     2017-10-10 00:00:00.000 NULL                        8620

Many thanks.

Answer 1

You can use lead() :

select t.*, lead(EffectiveDate) over (partition by product order by SeqNo) as EndDate
from table t;

However, lead() starts from version 2012 + , so you can use apply instead :

select t.*, t1.EffectiveDate as EndDate
from table t outer apply
     (select top (1) t1.*
      from table t1
      where t1.product = t.product and t1.SeqNo > t.SeqNo
      order by t1.SeqNo 
     ) t1;