查找匹配多个值的记录组

Question

我有以下数据：

ID --- ParentID --- DataValue  
1  ---    1     ---    1  
2  ---    1     ---    2  
3  ---    1     ---    6  
4  ---    2     ---    1  
5  ---    2     ---    2  
6  ---    2     ---    4  
7  ---    3     ---    1  
8  ---    3     ---    3  
9  ---    3     ---    5

对于每组记录（按ParentID分组），我想查找与DataValue中所有给定值匹配的所有组，例如：

• 对于值 (1,2)，将返回 ParentID 1 和 2
• 对于值 (1,6)，仅返回 ParentID 1（ParentID 2 组不包含 6）

我查看了this question，它非常相似，但 OP 会查找不包含单个值的组。

非常感谢任何帮助！

Answer 1

您可以使用条件聚合来做到这一点：

select parentid 
from tablename
group by parentid
having sum(case when datavalue = 1 then 1 else 0 end) > 0 and
       sum(case when datavalue = 6 then 1 else 0 end) > 0

另一种方法是使用exists:

select distinct parentid
from tablename t1
where exists(select * from tablename where parentid = t1.parentid and datavalue = 1) and
      exists(select * from tablename where parentid = t1.parentid and datavalue = 6)

另一种方法是计算不同的出现次数：

select parentid 
from tablename
where datavalue in(1, 6)
group by parentid
having count(distinct datavalue) = 2