A common use of data validation is to create a drop-down list. Use it to restrict the type of data that users enter into an Excel cell.

We’ll use data validation to prevent duplicate numbers in the Membership Number column. First, enter the following function into cell K3: =COUNTIF(Table1[Membership Number],B3) ...

However, you can also use other rules like Top/Bottom rules, Data Bars, Color Scales, or Icon Sets to find discrepancies in Excel data. 3] ... that’s when you use Data Validation.

How to embed a data validation control in Excel. We’ll begin by creating a data validation control and populating it with the name of a few tasks. When applying this to your own work, ...