You can easily create a drop-down list in Excel to limit the values that can be entered in a column. Here's how to set one up ...

You can remove duplicates in Excel in a few steps. Duplicates can create problems when you're dealing with data.

The simplest way to think about SCAN is that it applies a custom calculation to each element in a range/array and returns every intermediate result it produces along the way. If that sounds abstract, ...