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Calculate SUM of fields when some of the fields can be NULL





I want to calculate a sum of several (6) fields using  calculated value field. Almost always there will be fields with NULL value among these 6. How do I create a formula that 1) scan all 6 fields, 2) select only fields with value (or replace NULL value with 0) and 3) sum these fields. 



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You can use the ISNULL function for each field and set it to zero to have the null fields converted to zero.

Something like this:
ISNULL([@field:number1],0) + ISNULL([@field:number2],0) + ISNULL([@field:number3],0) + ISNULL([@field:number4],0)

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