Subtracting one records field from another. Mar06-Feb06 (variance)

I have two fields with data in them.  I want to create a query, add the two fields, and then subtract one from the other.  I don't know how to do it.
Becky EdwardsEpic Clarity DeveloperAsked:
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Are the fields in the same "row"? If so, you can create a calculated field. In a blank column of your query grid, in the Name row:

AddFields: (DateField1 + DateField2)

Same for subtracting them:

SubtractFields: DateField1 - DateField2

This would result in your query having two new fields - one named AddFields and one named SubtractFields.

If either of these could contain Null values, you'd want to use the Nz function:

AddFields: (Nz(DateField1,0) + Nz(DateField2, 0))

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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Sorry ... I see that you mention "records" in your question, which would indicate that these are not in the same row. If that's the case then no, you really cannot do this. You could build a subselect that did this, but you'd have to have some sort of Ordering field that would correctly sort your values. If you provided a sample of the data, perhaps we could help further.
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