一个有趣的棘手的过滤器（不知道如何在标题中描述它）

Question

我的表是这样的：

Item   Subitem    Progress  
1      101        Complete  
1      102        Pending
1      103        Pending
2      201        Complete
2      202        Complete

我想选择子项全部完整的项目 - 在这种情况下，项目＃2。知道怎么做吗？ 谢谢！

Answer 1

有很多方法：

select Item from T group by Item
having min(Progress) = max(Progress) and max(Progress) = 'Complete'

或

having count(case when Progress = 'Complete' then 1 end) = count(*)

或

having count(case when Progress = 'Complete' then null else 1 end) = 0 /* handles nulls */

或

select distinct Item from T t
where 'Complete' = all (select Progress from T t2 where t2.Item = t.Item)

Answer 2

因此，您基本上希望所有没有任何Subitems处于待处理状态的项目

假设您显示的表是SubItems表，并且还有另一个Items表...

SELECT *
FROM Items
WHERE ITEMID NOT IN (SELECT ITEMID 
                     FROM SubItems 
                     WHERE Progress != 'Complete')