Adding a null value in access table

I have two columns in Access. I would like to sum fields from these two columns into a new column but I have some NULL values in some of the fields.

How can I do this?

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Randy PooleCommented:
for those colums use the isnull with IIF as

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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Or just use Nz. If you're doing this in a query, for example:

SELECT Col1, Col2, Nz(Col1,0) + Nz(Col2, 0) AS SumOfCols
vpopperAuthor Commented:
Total - All Credits: =NZ[Supplier Credit] + NZ[SS Credit]

This is my ACCESS Query - using NZ but this is not working???

Dale FyeCommented:
The NZ( ) function must have opening and closing ()

Total - All Credits: NZ([Supplier Credit], 0) + NZ([SS Credit], 0)

BTW,  it is a bit confusing that you are labeling this column as "Total - All Credits" and are doing a sum in the calculation.
Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
You must enclose Nz with parentheses:

Total - All Credits: =NZ([Supplier Credit],0) + NZ([SS Credit],0)

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