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"Key" option greyed out in column properties

I have a three column table:

 

PK

alternate PK

measure

 

I can use the drop-down to identify PK as a key, but the option is greyed out for alternate PK.   I don't think it has any practical effect, but why would I not have the option?

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  • Hi R. A. Dawson Sr I suspect the alternate PK column is a double? Floating points are not eligible for a unique constraint. 

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    • Dustin Basil  Thank you!

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