Here is an attempt ...
select p.*
from persons p
where sid in
(select sid, count(bid)
from bids
group by sid
having count(sid) = (select count(boad_id) from boats))
/
You wanted to find all persons who have booked all boats ... add criteria for booked in the first sub-query.
Raj
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Rajendra dot Jamadagni at nospamespn dot com
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