Unable to create index because of duplicate that doesn't exist?

Question

I\'m getting an error running the following Transact-SQL command:

CREATE UNIQUE NONCLUSTERED INDEX IX_TopicShortName
ON DimMeasureTopic(TopicShortName)
         


        

Answer 1

It's because you have records in the table already that are not unique (by the sounds of it, 2 records with a blank value in the TopicShortName field).

So, it's to do with the data, not the index itself.