你很亲密 您可以将DISTINCT关键字添加到COUNT中，以按天获取唯一身份的团队成员数。

SELECT CAST(stat_datetimeresolved as date) as DateResolved
, ResolvedByTeam
, COUNT(DISTINCT resolvedby) as ResolvedByCnt
FROM [dbo].[Incident]
 WHERE Stat_DateTimeResolved >= '20170401'
GROUP BY CAST(Stat_DateTimeResolved as DATE), ResolvedByTeam
ORDER BY CAST(stat_datetimeresolved as DATE) asc, ResolvedByTeam

您在此处的问题中有多个不兼容的请求。 我认为您所追求的实际上是：

自2017年4月起，每个团队每天有多少人制定决议？

为此，您只需要返回一个唯一的列表，其中包含解决日期，个人所属的团队以及实际做出解决的团队，然后进行汇总：

with r as
(
    select distinct cast(stat_datetimeresolved as date) as DateResolved
                   ,ResolvedByTeam
                   ,ResolvedBy
    from [dbo].[Incident]
    where Stat_DateTimeResolved >= '20170401'  -- NULL check is redundant if you are filtering for a value
)
select DateResolved
      ,ResolvedByTeam
      ,count(ResolvedBy) as NumIndividualsMakingResolutions
from r
group by DateResolved
        ,ResolvedByTeam
order by DateResolved
        ,ResolvedByTeam;