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A question on function "then"

Pei Hsuan Shen 2

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I am reading the document onhttps://docs.tibco.com/pub/spotfire/7.0.0/doc/html/ncfe/ncfe_using_expressions_on_aggregated_data_the_then_keyword.htm.

The example shows that


Instead of: Sum([sales]) OVER (AllPrevious([Axis.X]))

Use: Sum([sales]) THEN Sum([Value]) OVER (AllPrevious([Axis.X]))".


But as far as I know, Value is equal to Sum([sales]). So, the use becomes that

"Use: Sum([sum([sales])]) OVER (AllPrevious([Axis.X]))".

I am confused. Can someone tell me what wrong is

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