A Oracle sql query is needed, please help me out

Question

Hi,
I have a table similar to scott.emp table and i should get first three recently joined employees salaries according to their joined date from each deptno
output should like this:
deptno firstempsalary secondemplsal thirdemploysalary
10 xxx xxx xxxx
20 xx xx
30 xx xxx xxxx
40 xx
50 xx xxxx xxx
60 xx xx
70 xx
it means that 70 dept having only one employee and 20 dept having only two employees and 10 dept having more than three employees but we should get only three recently joined employees salaries from 10 dept.
Hope this is clear .. please give me a query to get this info ..
oracle is 10g version
great thanks in advance.

Answer 1

select deptno,
max(case jd_rank when 1 then salary end) firstempsal,
max(case jd_rank when 2 then salary end) secondempsal,
max(case jd_rank when 3 then salary end) thirdempsal
from
(select salary, deptno, row_number() over(partition by deptno order by join_date desc) jd_rank from emp)
group by deptno
Problem here is what to do when employees have the same join date? This example will arbitrarily choose their order and if, for example, three employees share the same (most recent) join date then they will arbitrarily be classed as "first", "second" and "third". If four employees join at the same time, one of them will be ignored at random!
Edited by: user10548434 on 03-Dec-2008 06:27