MS SQL如何选择最后N条记录相同的客户端

Question

我有一个包含ClientID，ActionDate，Action和Result的表。

我需要选择在给定日期范围内仅具有特定操作/结果组合的不同客户。

为了显示：

1. 我需要最后5个Action / Result是Call / NoAnswer的不同的clientID。
2. 我需要过去30天内仅具有Call / NoAnswer的独特的clientID。

谢谢

Answer 1

1。

select ClientID from
(
select 
  ClientID,
  Action,
  Result,
  row_number() over (partition by ClientID order by ActionDate desc) as num
from ClientActions
) T -- the latest 5 action/result
where rnum <= 5
group by ClientID
having MAX(case when Action='Call' and Result = 'NoAnswer' then 0 else 1 end) = 0

2。

select ClientID
from ClientActions
where DATEDIFF(DAY, ActionDate, GETDATE()) <= 30
group by ClientID
having MAX(case when Action='Call' and Result = 'NoAnswer' then 0 else 1 end) = 0