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I have to replace the negative values with 0 in Running sum field.

I have created a calculation, like this

IF SUM([Sales]) < 0 THEN 0 ELSE RUNNING_SUM(SUM([Sales])) END

Table calculation using "Across". But I am not getting expected result.

enter image description here

I should get the results like this: enter image description here

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    You can simplify the expression slightly as RUNNING_SUM(MAX(0, SUM([Sales])). And you also need to set the partitioning/addressing aka "compute using" settings as desired, just as for any table calc. Commented Mar 8, 2024 at 22:28

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You're very close, calculate Down the table rather than Across it.

See how to transform Table Calculations in the Tableau Documentation.

Also see the Running Sum Calculation Documentation.

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