Here we have to find the name of the sailor who has reserved most number of boats in a single day.
We can do this by using group by on reserves table on column sid and day. Because group by on sid and day will group all rows with same sid and day. Now we have to select the max count among this, and then using the sailors table find the sname using sid.
SQL Query :
select sname from Sailors where sid in ( select top 1 sid from Reserves group by sid,day order by count(*) desc)
Please let me know in comments if you have any doubts.
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