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  1. or download this
    Student|Subject|Marks
aaa|eur|100
...
bbb|usd|80
bbb|usd|100
  2. or download this
    aaa->eur->100 
aaa->eur->101
...

aaa->usd->90 
aaa->usd->80
  3. or download this
    aaa,eur,sum(100,101,90)
aaa,usd,sum(90,80)
  4. or download this
    aaa,eur,100,sum(gg)
aaa,eur,100,sum(hh)
...
aaa,eur,90,sum(dd)
aaa,eur,90,sum(sf)
aaa,usd,90,sum(eq)