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Each cell on a spreadsheet is unique, as all cells have different cell references. So there is only one cell G4 on a sheet for example. In a formula you can refer to that cell and it will not be confused with any other cell. Cells and cell ranges can be given names, but the same name cannot be used for separate cells or separate ranges.

In a database situation, you can set up fields that cannot have duplicate values. These can be primary keys. If you try and enter the same value again, it will not allow you. This allows you to uniquely identify each record in the database.

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