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Two of the columns in Query A are labeled 2012 and 2011.
However, next year, the columns will be 2013 and 2012. This is because those columns are part of a crosstab where the name is done via the year() function.
Anyway, I am using a new query to add a column that subtracts the values in the two year columns, but I don’t know how to refer to those columns dynamically.
e.g. I could easily add a column
Difference: [2012 Revenue] - [2011 Revenue]
But this would stop working next year.
Building on HelloW excellent suggestion, you could use as the Column Header of your Crosstab an expression like
"RevYr" & (Year(Date())-Year(RevenueDate), which would evaluate toRevYr0, RevYr1, RevYr2, etc…
Your difference would then become
Edit:
Facing a similar problem using a crosstab, I found these 2 very interesting links:
http://allenbrowne.com/ser-67.html
http://www.access.hookom.net/DynamicMthlyCrosstabRpt.htm