根据下一个记录生效日期更新术语日期列

Question

你可以帮我解决这个问题吗？我的数据如下表所示

输入：

IDNO  EFFECTIVE DATE       TERM DATE
-------------------------------------    
100   10/01/2001           12/01/2012           
100   03/12/2013           05/02/2013           
100   05/03/2013           01/04/2014                  
100   10/10/2014           12/31/9999 
200   01/01/2017           02/15/2017
200   03/01/2017           12/31/2017

所需的输出：

IDNO  EFFECTIVE DATE       TERM DATE
-------------------------------------
100   10/01/2001           03/11/2012           
100   03/12/2013           05/02/2013           
100   05/03/2013           10/09/2014                  
100   10/10/2014           12/31/9999 
200   01/01/2017           02/28/2017
200   03/01/2017           12/31/9999

学期日期应为生效日期前一天，最新记录期限日期应始终为12/31/9999

我可能有相同ID的N条记录。

在MM/DD/YY

中指定日期值

Answer 1

您可以使用lead()：

with toupdate as (
      select t.*,
             lead(effective_date) over (partition by idno order by effective_date) as next_effective_date
      from t
     )
update toupdate
    set term_date = coalesce(dateadd(day, -1, next_effective_date), '9999-12-31')
    where term_date <> coalesce(dateadd(day, -1, next_effective_date), '9999-12-31');