Purpose of the guide

Understand how data validation allows you to limit the type of data or values that users enter into a cell.

Apply data validation to cells in Excel

1. Select the cell or cells for which you want to create a rule.
2. On the Data tab on the ribbon, choose Validate Data .
   
3. On the Settings tab, select an option under Allow :
   • Integer : to limit the cell to accept only integers
   • Decimal : to limit the cell to accept only decimal numbers
   • List - allows you to select data from the drop-down list
   • Date : only accepts entry of dates in cells
   • Time : to limit the cell to accept time only
   • Text Length : Limits the length of the text
   • Custom : Allows you to enter a custom formula
4. Under Data , select a condition:
   • between
   • not included between
   • equal to
   • different from
   • greater than
   • less than
   • greater than or equal to
   • less than or equal to
5. On the Settings tab, select an option under Allow :
   • Set the other necessary values based on the option chosen in Allow and Data . For example, if you select between , select the Minimum: and Maximum: value for cells
   • Select the Ignore blank cells check box if you want to ignore blanks
   • If you want to add a title and message for the rule, select the input message tab and then type a title and input message
   • Select the Show input message when cell is selected check box to display the message when the user selects or places the mouse pointer over the selected cells
6. Select OK .

If the user now tries to enter an invalid value, a pop-up window appears with the message “This value does not match the data validation restrictions defined for this cell”.

Videotutorial

Source

https://support.office.com/it-it/article/applicare-la-valida-dei-data-alle-celle-29fecbcc-d1b9-42c1-9d76-eff3ce5f7249