For many years, I used the SUBTOTAL function in Microsoft Excel to create easily visible subtotals at the top of my worksheets. However, when I encountered AGGREGATE, this became my go-to function ...

Adding a condition to a simple revenue sheet might spell trouble in Microsoft Excel, but don't worry--a simple conditional function can handle the request.

In the resulting dialog, choose Count from the Function dropdown. Click OK and Excel will display a subtotal for each date in the Due column. The results are a bit unwieldy, but they’re quick.