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An alternative work around is to take this:
select client, min(childAge) as youngest, max(childAge) as eldest
from table group by client
having youngest< 20 and eldest> 20
and convert it to
With T1 as (
select client, min(childAge) as youngest, max(childAge) as eldest
from table group by client
)
Select client, youngest, eldest from T1
where youngest< 20 and eldest> 20
either should work - your choice.
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