Sql server 使用distinct where子句向我的查询中添加另一列

有没有一种方法可以向第一个查询中添加另一个列，其中有一个单独的where子句不应用于其他列

select
  month(From_iso8601_timestamp(u.created)) as Month,
  count(distinct u.id) as Sign_Ups,
  count (distinct w.owner) as Sign_Ups_with_Want_Created,
  count(distinct g.owner) as Sign_Ups_with_Reel_Created
from
  prodjoinreel.users u
  left join prodjoinreel.goals g on g.owner = u.id
left join prodjoinreel.wants w on w.owner = u.id
where year(From_iso8601_timestamp(u.created)) = 2019
group by 1
order by 1

查询我想添加的附加列（我只想将where g.status='done'应用于Sign\u ups\u with\u complete\u revel列）：

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谢谢

如果我理解正确，那么您应该将“g.status=”done“从覆盖整个查询的where语句移动到count聚合中的case语句中。我已经在下面完成了这项工作，我还对您的查询进行了一些修改，以避免在月份计算中出现冗余：

select      New_Users = count(distinct u.id), 
            ap.Month,
            Sign_Ups_with_Want_Created = count(distinct w.owner),

            Sign_Ups_with_Reel_Created = 
                count(distinct 
                    case 
                    when g.status = 'done' then g.owner 
                    end
                )

from        prodjoinreel.goals g
right join  prodjoinreel.users u on g.owner = u.id
cross apply (select Month = From_iso8601_timestamp(u.created)) ap
where       year(From_iso8601_timestamp(u.created)) = 2019
group by    ap.Month
order by    ap.Month

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按2分组

？为什么要按整数2分组？也不能按顺序位置分组。必须使用列的表达式。因此，在本例中，它将是“按月分组（从_iso8601_timestamp（u.created））”，我同意@Larnu的观点，即您不应该按顺序进行订购。这充其量是有问题的。

select      New_Users = count(distinct u.id), 
            ap.Month,
            Sign_Ups_with_Want_Created = count(distinct w.owner),

            Sign_Ups_with_Reel_Created = 
                count(distinct 
                    case 
                    when g.status = 'done' then g.owner 
                    end
                )

from        prodjoinreel.goals g
right join  prodjoinreel.users u on g.owner = u.id
cross apply (select Month = From_iso8601_timestamp(u.created)) ap
where       year(From_iso8601_timestamp(u.created)) = 2019
group by    ap.Month
order by    ap.Month