A lesson learned in SSRS 2005

I was working on some large SSRS reports for Project Server 2007. I found sum(column A + column B) is not same as sum(column A) + sum(column B). Because, if there is any Null value in columns A or B, the first one will generate #ERROR message and the second one will handle this better.

Something you learned from elementary school is not sure any more in this complex world.

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