Thank you. That was helpful.
This is requirement.
1. I have data in DB
ex: of data in DB.

Student|Subject|Marks
aaa|eur|100
aaa|usd|90
aaa|eur|101
aaa|usd|80
aaa|eur|90
---------
bbb|usd|80
bbb|usd|100
[download]

.......
So Mapping goes like below:

aaa->eur->100 
aaa->eur->101
aaa->eur->90

aaa->usd->90 
aaa->usd->80
[download]

Output will be : 1.If level=2

aaa,eur,sum(100,101,90)
aaa,usd,sum(90,80)
[download]

so on..

2.If level is 3, we have more detailed level

aaa,eur,100,sum(gg)
aaa,eur,100,sum(hh)
aaa,eur,101,sum(gf)
aaa,eur,101,sum(s)
aaa,eur,90,sum(dd)
aaa,eur,90,sum(sf)
aaa,usd,90,sum(eq)
[download]

...
Here its the users choice if u want to print at 2 level or 3 level or more..
If level is 4 then we go into detailed level.

Hope this requirement helps
I want to dynamically store the values in arrays and iterate through these arrays and get this values.

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