On Nov 16, 2010, at 11:55 PM, Bart Smissaert wrote:
> This seems to work fine,
Then you are golden :)
> but I am not sure if this SQL is correct and
> if the results will always be correct and have a feeling
> that there must be a better construction.
> Any suggestions?
Nothing very meaningful, but you could rewrite the 'in' clause as a 'join' to
avoid all these concatenations, e.g.:
select t1.patient_id
from table1 t1
join (
select table1.address,
min( table1.date_of_birth ) as date_of_birth
from table1
group by table1.address
)
as t2
join t2.address = t1.address
and t2.date_of_birth = t1.date_of_birth
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