MS SQL如何选择最后N个记录相同的客户端

Question

我有一个由ClientID，ActionDate，Action和Result组成的表。

我需要选择具有特定日期范围内的特定操作/结果组合的不同客户端。

举例说明：

1. 我需要不同的clientId，其最近5动作/结果是呼叫/无应答。
2. 我需要在过去30天内只有Call/NoAnswer的独特clientID。

感谢

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