score:3

Accepted answer

You can do this with conditional aggregation:

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

Another way is use 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)

Another way is counting distinct occurrences:

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

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