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Excel's data validation is far more powerful than just dropdowns — here's what it can actually enforce

Most people set up a dropdown list to make spreadsheets smarter with Excel's data validation. However, the Custom option in the Data Validation dialog accepts any formula that returns TRUE or FALSE, ...
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Excel's Custom Data Validation: A Trick You Didn't Know You Needed

Data validation in Excel lets you restrict what can be entered into a cell, whether whole numbers, decimals, dates, or a certain number of characters. However, one of the most powerful capabilities of ...