2025 Dealing with Duplicate Data in Excel

In this presentation author and Excel expert David Ringstrom, CPA, shows you how to create and remove duplicate data in Excel. You’ll see mouse tricks for quickly duplicating rows, columns, and entire worksheets, as well as duplicating formatting to disparate cells. David will demonstrate the nuances of duplicates when using lookup functions, and how to easily identify duplicate data with the Conditional Formatting feature. You’ll also see how to use the Data Validation feature to prevent users from entering duplicate values into specified cells.

Topics typically covered:
• Removing Conditional Formatting rules when they are no longer needed.
• Duplicating columns, rows, or cells within an Excel worksheet.
• Resolving situations where data appears more than once within a PivotTable.
• Counting occurrences of an item in a list using the COUNTIF function.
• Highlighting repeated entries in a list by combining COUNTIF with Conditional Formatting.
• Duplicating Excel worksheets in two different ways.
• Using Excel’s Advanced Filter feature to identify duplicates within a list.
• Removing duplicates from a list with the UNIQUE function in Excel 2021 and later.
• Applying formatting to multiple locations within a worksheet by way of the Format Painter feature.

Learning objectives:
• State which Data Validation Error Alert prevents users from overriding the data validation rule assigned to a cell.
• State what SUMIF returns if a match cannot be found.
• Identify the arguments that correspond to the UNIQUE function.

Our Refund Policy can be found at: https://cpeprime.com/cancellation-and-refund/