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.

 

Thanks

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