I am looking for a function in Access that can sum a range of columns. In my table, I have 12 months of sales data in crosstab format. In other words, the table look like this:
Part# Jan Feb......Dec
1234 12 32...... 34
What I want to achieve is sum on running bases. For example, for the month Mar., sum the sales for Jan and Feb, while for the month of July, sum the sales from Jan thru Jun. There are business reasons why I need to do this way. Question is how to make the Sum function work in Access. I know in Excel you can simply put a range, Sum(A1:A12). That does not seem to work in Access.
Appreciate any ideas!