Question

我正在尝试根据两列的组合对表中的列进行uodate。如果值为null，则从开始时间开始我将其设置为0，否则我将其设置为最大值，直到该日期为止。我是使用SQL SERVER 2008.Thanks提前获得帮助！

  update Table1
  set value = a.value
 from
     ( SELECT product, 
     week , 
         case when  value is null then 
                (case when  max(value) over(PARTITION BY product                ORDER        BY       week ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) is null then 0 
                 else (max(value) over (PARTITION BY product ORDER BY week ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)) end )  
           else value  end as value
  from table2 ) a
   where a.product = table1.product
        and a.week = table1.week

Answer 1

2012年ROWS子句中添加了OVER关键字。您将无法在2008年使用该关键字。

https://msdn.microsoft.com/en-us/library/ms189461(v=sql.110).aspx

sql server中的语法不正确，无法弄清楚原因

1 个答案: