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Group Wise Incremental Calculation

Group Wise Incremental Calculation

Group Wise Incremental Calculation


No  Al_No  Amt
X1   1      20
X1   2      30
X1   3      40
X1   4      50
X2   1      60
X2   2      20

I have a source as above

Data that shud be populated in Target

No  Al_No  Amt   Prev_buffer_Amt
X1   1      20      0 (shud be)
X1   2      30      20
X1   3      40      50 (sum of prev amts (20+ 30))
X1   4      50      90 (group wise calculations (20+30+40))
X2   1      60      0
X2   2      20      60

Data in Column Prev_buffer_amt shud be the Prev records sum amt (group by NO). For 1st records Prev_amt will be Zero.For 2nd record Prev_amt shud be the 1st record amt,
For 3rd record, sum of (1st and 2nd records amts)......

Can it be calculated in Expression Transformation?

kindly help....


RE: Group Wise Incremental Calculation

I got answer from the post given by MacLeod72 on running totals..
Port 1: KEY Input
Port 2: VAL Input
Port 3: V_TOTAL Variable Exp: IIF(KEY != V_KEY, VAL, V_TOTAL + VAL)
Port 4: V_KEY Variable Exp: KEY

Thanks to MacLeod72

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