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This is my table
Date, Properties, Value
11/12/12, Fridge, 20
11/12/12, A/c, 30
12/12/12, Fridge, 30
12/12/12, A/c, 40
12/12/12, TV, 60
13/12/12, Fridge, 70
13/12/12, LCD, 40
i used straight table in that i took date and properties as dimension value as expression
Date, Properties, Value,result
11/12/12, Fridge, 20,20
11/12/12, A/c, 30,30
12/12/12, Fridge, 30,50
12/12/12, A/c, 40,70
12/12/12, TV, 60,60
13/12/12, Fridge, 70,120
13/12/12, LCD, 40,40
my result should look like this