how to fetch second last record form table in oracle sql|Fetch only last second record in oracle|

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how to fetch second last record form table in oracle sql|Fetch only last second record in oracle|

[life_style]

I have doubt - when i am writing the query in from clause it is giving output.
Example -select * from ( select empno, ename, job, row_number ()over(order by empno desc) as rn from emp)
where rn=3


But when i am writing like this why not coming output
Example -select empno, ename, job, row_number ()over(order by empno desc) as rn from emp
where row_number=1

[life_style]

Can we insert data like 1000 rows in one time or we have to write all time like this 1st row--> insert into <TABLENAME> value ( 'vi' 123, 'mh' 5900)
2nd row--> insert into <TABLENAME> value ( 'si' 12r, 'ap' 6000)