在SQL Server中领先和落后

2022-08-14 00:00:00 sql window-functions sql-server

我正在尝试确定保存票证后是否应用了模板。 代码确实运行,但它不从操作列捕获字符串"模板已应用"。

这是我获取数据的表格:

以下是我得到的结果:

我的代码:

SELECT *
FROM
    (SELECT              
         [ACTION], 
         CASE
            WHEN ACTION = 'Save' AND LAG(ACTION) OVER (ORDER BY SYS_CREATED_BY, SYS_CREATED_ON) LIKE 'Template Applied%' AND LAG(SYS_CREATED_BY) OVER (ORDER BY SYS_CREATED_BY, SYS_CREATED_ON) = SYS_CREATED_BY 
               THEN 1 
               ELSE 0 
         END AS RELEVANT_SAVE, 
         [TICKET_NUMBER], 
         [USER_ID], 
         [SYS_CREATED_BY], [SYS_CREATED_ON], 
         DATEPART(YEAR, [SYS_CREATED_ON]) AS YEAR, 
         DATEPART(MONTH, [SYS_CREATED_ON]) AS month
     FROM            
         TICKETSDB
     WHERE        
         (ACTION = 'Save' OR ACTION LIKE 'Template Applied%')) AS T

解决方案

您似乎需要将部分order by移动到partition by

leadlag语句中,将over子句更改为

OVER (PARTITION BY SYS_CREATED_BY ORDER BY SYS_CREATED_ON DESC) 

这将确定您希望按人员查看它的位置。

如果您不介意,可以将其完全删除

 OVER ( ORDER BY SYS_CREATED_ON) 

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