Answer Posted / babu

Hi,
Mapping:

SRC==>EXP==>AGGR==>UNION
|==>TRG
SRC==>

EXP:In first DFD we have EXPR and AGGr,in EXPR we have to
take one output port with a constant value by using that
output port calculate the sum sal in AGGR.In AGGR take one
output port that as name field with constant value(total)
and the sum sal field as sal after that UNION trns is there
union the two DFD's,finally we get the what we expect.

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