How to find growth difference between the employees in different year

Question

Hi All,
I have one table. In that how I can find the growth of employees between two years means suppose there are
100 employees in 2009 and now 50 more added in 2010.then can anyone tell me the sql query how i can find that difference and i have to also store that result in a variable.
Edited by: user13310428 on Aug 2, 2010 10:21 PM

Answer 1

Can you try below query
SQL> ed
Wrote file afiedt.buf
  1  with c as
  2  (select 2009 yy, 100 cnt from dual union all
  3  select 2010 , 150 from dual)
  4  select yy, cnt-prev Diff
  5  from
  6  (
  7  select yy,cnt, lag(cnt) over (order by yy) prev
  8  from c
  9* )
SQL> /
        YY       DIFF
      2009
      2010         50If you want to show growth in % also, you can use
with c as
(select 2009 yy, 100 cnt from dual union all
select 2010 , 150 from dual)
select yy,cnt-prev Diff,(cnt-prev)/prev growth
from
select yy,cnt, lag(cnt) over (order by yy) prev,lead(cnt) over (order by yy) nxt
from c
SQL> /
        YY       DIFF     GROWTH
      2009
      2010         50         .5