Obtaining Unique Number From Data Validation List

[Matt]

I have a spreadsheet where I need to obtain a unique number from a
predetermined list for different entries on different rows (these rows are
not grouped together or in sequence). I need to pick this unique number
sequentially however I cannot use the same number twice. I have tried using
a data validation list however this allows the same number to be used
multiple times. Is there a method where the number can only be used once?

 

[Debra Dalgleish]

There are instructions here for hiding used items in a data validation list:

http://www.contextures.com/xlDataVal03.html

 

[JE McGimpsey]

No, it actually doesn't...

Did you try it?

 

[T. Valko]

You can save a few keystrokes in the dynamic range formula by replacing:

COUNTA('Employees - Original Formula'!$C$1:$C$6)-COUNTBLANK('Employees -
Original Formula'!$C$1:$C$6)

With:

COUNTIF('Employees - Original Formula'!$C$1:$C$6,"?*")

 

[Matt]

Thank you Debra. A bit complicated (for me) but works a treat!

 

[T. Valko]

Even better:

You can replace:

COUNTA('Employees - Original Formula'!$C$1:$C$6)-COUNTBLANK('Employees -
Original Formula'!$C$1:$C$6)

With:

COUNT('Employees - Original Formula'!$B$1:$B$6)