Issue with how to compute additional column in query output.

Question

Hello PL/SQL Gurus/experts,
I am using Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production version
Currently i have the data in the following way -
drop table T2;
create table T2(Year, MastTot, BechTot, Tot) as select
'2008', '20000', '450000', '470000' from dual union all select
'2008', '50000', '324000', '374000'  from DUAL union all select
'2009', '25000', '450000', '475000'  from dual union all select
'2009', '250000', '324000', '574000' from DUAL union all select
'2010', '120000', '450000', '570000' from dual union all select
'2010', '52000', '324000', '376000'  from DUAL union all select
'2011', '220000', '450000', '670000' from dual union all select
'2011', '52000', '324000', '376000'  from DUAL ;I want the data to be presented in the following way (output)-
Year     MastTot     %Change     BechTot     %Change     Tot     %Change     %Total
2009     275000     292.86     774000     0     1049000     24.29     27
2010     172000     -37.45     774000     0     946000     -9.82     24.35
2011     272000     58.14     774000     0     1046000     10.57     26.92
Total     789000     313.54     3096000     0     3885000     25.04     78.28I am using the following sql query -
select decode(grouping(Year), 0, Year, 'Total') Year,
       To_Char(sum(MastTot), '999,999,999,999,999,999,999.99')  "MastTot",
       To_Char(sum(BechTot), '999,999,999,999,999,999,999.99')  "BechTot",
       To_Char(sum(Tot), '999,999,999,999,999,999,999.99')  "Tot",
       round((sum(Tot)/nullif(max(total_amount),0)) * 100, 2) "%Total"
  From
select Year,
       sum(MastTot) MastTot,
       sum(BechTot) BechTot,
       sum(Tot) Tot,
       SUM(Tot) over() total_amount
  From t2
group by Year,Tot
where Year>'2008'
group by grouping sets((Year),())
order by YearBut i am not able to fetch the %Change column. Kindly help me with that.
All efforts and help in this regard is highly appericated and i will be thankful to you ...

Answer 1

Hello Purvesh K/jeneesh
If data turn out to the be following -
drop table T2;
create table T2(Year, MastTot, BechTot, Tot) as select
'2008', '20000', '450000', '470000' from dual union all select
'2008', '50000', '324000', '374000'  from DUAL union all select
'2009', '25000', '450000', '475000'  from dual union all select
'2009', '250000', '324000', '574000' from DUAL union all select
'2010', '120000', '0', '570000' from dual union all select
'2010', '52000', '0', '376000'  from DUAL union all select
'2011', '220000', '450000', '670000' from dual union all select
'2011', '52000', '324000', '376000'  from DUAL ;and if i use the following sql -
select year, sum(masttot), sum(change), sum(bechtot), sum(b_change), sum(tot), sum(t_change)
  from (
          select lead(year) over(order by year) year,
                 lead(masttot) over (order by year) masttot,
                 round((lead(masttot) over (order by year) - masttot)/nullif(masttot,0), 4) * 100 Change,
                 lead(bechtot) over (order by year) bechtot,
                 round((lead(bechtot) over (order by year) - bechtot)/nullif(bechtot,0), 4) * 100 B_Change,
                 lead(tot) over (order by year) tot,
                 round((lead(tot) over (order by year) - tot)/nullif(tot,0), 4) T_Change
            from (
                  select year, sum(masttot) masttot, sum(bechtot) bechtot, sum(tot) tot
                    from t2
                   group by year
                   order by year
       ) a
where year is not null
group by yearor
with t
as (
select year,masttot,lag(masttot) over(order by year) prevm,
BechTot,lag(BechTot) over(order by year) prevb,
tot,lag(Tot) over(order by year) prevt,
sum(tot) over(order by null) sm_t
from(
select Year,
sum(MastTot) MastTot,
sum(BechTot) BechTot,
sum(Tot) Tot
From t2
group by Year
select year,sum(masttot) masttot,
sum(((masttot-prevm)/nullif(prevm,0))*100) Perc_m,
sum(BechTot) bechtot,
sum(((BechTot-prevb)/nullif(prevb,0))*100) Perc_b,
sum(tot) tot,sum(((tot-prevt)/nullif(prevt,0))*100) Perc_t,
sum((tot/nullif(sm_t,0))*100)  perc_total
from t
where year > 2008
group by rollup(year);then it is not giving the correct result as in case of 2010 to 2011 in %B (Bechelor) total there is 100% change as from in year 2010 sum(bechtot)=0 and in year 2011 it is 774000.
Whats wrong with this ..........
Thanks in advance for your help/effort and valuable
Edited by: user555994 on Oct 15, 2012 5:24 AM