How to prevent dobbel entry a value in google sheets

S

steffenanderson

New Member
Joined
Dec 13, 2020
Messages
1
Office Version
  1. 365
  2. 2019
Platform
  1. Windows
I have over 300 mails and I'm adding new mails everyday and don't want to enter a email twice, how can I prevent this? Im using google sheets
 

Excel Facts

Using Function Arguments with nested formulas
If writing INDEX in Func. Arguments, type MATCH(. Use the mouse to click inside MATCH in the formula bar. Dialog switches to MATCH.
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