当前行为NULL

Question

我知道有很多解决方案，但不幸的是我无法使用分区或关键字TOP。我在之前的帖子中没有尝试过任何作品。

我的表格如下：

我想要的结果是当任何完成百分比为NULL时，它应该从上一个非值完成百分比中获取值，如下所示：

我尝试了这个查询，但没有任何效果。你能告诉我哪里出错了吗？

SELECT sequence,project_for_lookup,
CASE WHEN completion_percentage IS NOT NULL THEN completion_percentage 
ELSE 
     (SELECT max(completion_percentage) FROM [project_completion_percentage] AS t2
     WHERE t1.project_for_lookup=t2.project_for_lookup and
           t1.sequence<t2.sequence and
           t2.completion_percentage IS NOT null

END 

FROM [project_completion_percentage] AS t1

Answer 1

SQL Server 2008不支持累积窗口功能。所以，我建议file_get_contents：

outer apply

Answer 2

这有用吗？对我来说似乎。你错过了一个括号，并且顺序倒退了。

http://sqlfiddle.com/#!3/465f2/4

SELECT sequence,project_for_lookup,
CASE WHEN completion_percentage IS NOT NULL THEN completion_percentage 
ELSE 
     (
         SELECT max(completion_percentage) 
         FROM [project_completion_percentage] AS t2
         WHERE t1.project_for_lookup=t2.project_for_lookup 

           -- sequence was reversed. You're on the row t1, and want t2 that is from a prior sequence.
           and t2.sequence<t1.sequence  
           and t2.completion_percentage IS NOT null

     --missing a closing paren
     ) 
END 

FROM [project_completion_percentage] AS t1