How do you select n rows and not the whole table

Hi
I would like to only select the first 50 rows from a table and not the entire table. how do i accomplish this
Thanks

Sayeed's example will work great if you don't care which 50 rows you get back. If you do, you can use an inline view to sort them first and get back a ranked result set:
select *
from (select whatever
from table
order by key desc
where rownum <= 50

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How do you select n rows and not the whole table

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