To select last 'N' records in a table

This query will fetch you last N rows from the table--

select * from emp where empno not in (select top ( (select count(*) from emp) - 'N') empno from emp ) or

If you are using ORACLE SQL then the query for the same question is
--
select * from ( select rownum as rank,empno,sal
from emp ) where rank>((select max(rownum) from emp)-'N');

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