She'd like to count the number of unique dates for each nurse. A PivotTable is the most efficient solution for Lan, but the dataset needs a grouping value before the PivotTable can work.

How to obtain a Distinct Count in Excel using a basic PivotTable.

If you are unfamiliar with inputting formulas into Microsoft Excel, the much simpler way to get the number of unique values in an Excel column is through a filter. Although you will end up having ...

Learn how to count the number of unique and distinct values in a column based on data in another column using array in Microsof Excel.

When counting unique values in Microsoft Excel, use UNIQUE() as a helper function and avoid more complicated expressions.