SQL服务器最近3个月的任意一个值大于3时查询显示数据

Question

如果过去 3 个月中的任何一个月的值>=3，我想过滤该值。 请参阅我在 output 中突出显示的图像。

我试过的查询。

select Application_Infrastructure,year,month_name,count(ticket_no) as 'CN' from [service_delivery]
where month_num in (MONTH(getdate()),MONTH(getdate())-1,MONTH(getdate())-2,MONTH(getdate())-3)
group by Application_Infrastructure,year,month_name 
having count(ticket_no)>=3
 order by Application_Infrastructure,CN 

having count(ticket_no)>=3正在消除该月小于 3 的值。

请看图片

Answer 1

您可以使用 window max()在子查询中计算 3 个月内每个application_infrastructure的最大计数，并在外部查询中按该计数进行过滤。

select *
from (
    select 
        application_infrastructure, 
        year,
        month_name,
        count(ticket_no) cn,
        max(count(ticket_no)) over(partition by application_infrastructure) max_cn
    from service_delivery
    where datefromparts(year, month_num, 1) 
        >= dateadd(month, -3, datefromparts(year(getdate()), month(getdate()), 1))
    group by application_infrastructure, year, month_num, month_name
) t
where max_cn <= 3
order by application_infrastructure, cn

请注意，我重写了您的where子句，以便它在过去 3 个月内正确且更有效地过滤。