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

The duplicate is in your data, try running this query to find it.

SELECT TopicShortName, COUNT(*)
FROM DimMeasureTopic
GROUP BY TopicShortName
HAVING COUNT(*) > 1