Business Intelligence with Microsoft Power BI - with Material - Conditional Column- Two Columns

This video tutorial explains how to use conditional columns in Power BI to assign prefixes based on gender and marriage status. It covers the logic for assigning 'Mr.', 'Miss', or 'Mrs.' and demonstrates how to implement this in Power Query. The tutorial also addresses common errors, such as issues with open Excel files, and concludes with a summary of the process.

Describe the process of adding a conditional column in Power BI as mentioned in the text.

What error occurs when the Excel file is open during the process, and how can it be resolved?