Answer / umesh h

Use Minus Operator
select * from emp where rownum<=101
minus
select * from emp where rownum<=100;
Here minus will display data only from first query minusing
from 2 query.

Answer / vishnu

if you have table temp_test1

you fire
select * from temp_test1
now you want 101 rows
basic thing here is records are sorted by rowid as per
insertion

for 101 th row

select * from temp_test1 where rowid in(
(select max(rowidtochar(rowid)) from temp_test1 where
rownum<102))
this is asked in tech mahindra

Answer / meher

Let the table name is EMP

To find 101st row the query is as below:

select * from EMP where rownum <= 101
minus
select * from EMP where rownum <= 100;


for Nth salary the query is as below:

SELECT DISTINCT (a.sal) FROM EMP A WHERE &N = (SELECT COUNT
(DISTINCT (b.sal)) FROM EMP B WHERE a.sal<=b.sal);

Answer / priya

Here It is asked for 101 row. It does not mean ascending or
descending order.
So query goes like this

Ans:select * from emp where rowid in(
select max(no) from
(select rowid as no,sal from emp where rownum<102));

To Find the 101th row higest salary
Ans:
select max(sal) from (
select * from emp order by sal) s where rownum<102;

similarly for 4th highest it is 5 and for (n-1)th sal it is
n.

Answer / hemant

select * from emp where (rowid,0) in
(select rowid,mod(rownum,101) from emp)
and rownum=1

Answer / m.raghu

answer for 101th record

select * from emp where empno in( select decode
(rownum,&n,empno) from emp);

for 4th highest sal

select distinct sal from(select empno,dense_rank() over
(order by sal desc) rnk from emp) where rnk=&n;

for 5th highest sal give n value=5
for 1-10

select distinct sal from(select empno,dense_rank() over
(order by sal desc) rnk from emp) where rnk<=&n;

Answer / basavaraj yadwad

Let Table name : Employee
Let the columns: Employee_name, Salary

To find 101st row:

select * from (select * from Employee order by
emplayee_name) where rownum = 101

To find 4th highest salary

select * from (select * from Employee order by salary desc)
where rownum = 4


To find 5th highest salary

select * from (select * from Employee order by salary desc)
where rownum = 4


To find 1 to 10 highest salary

select * from (select * from Employee order by salary desc)
where rownum < 11

Explain two easy sql optimizations.

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