Sharepoint Unique values over 3 columns

Senior Member

Good Morning,


I am trying to find a solution, I have a list which i need to make unique value over 3 columns


1st Column - Reservation Date - (DATE&TIME)

2nd Column - Time Slots (CHOICE)

3rd Column - Resident Full Name ( Look Up Value)


would like to make these all column together as unique so i wont make "double" reservation.


Appreciate if i get some help with this.



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