alter a table add Unique key in my sql server DB?

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I want to alter table add Unique key in my database table Question has NOT NULL KEY ALREADY
That table does contains distinct data

ALTER TABLE [dbo].[Questions] ADD constraint q_pk UNIQUE (Question);

.

But it shows error like
Column 'Question' in table 'Questions' is of a type that is invalid for use as a key column in an index.

Posted 20-May-14 19:46pm

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Maciej Los 21-May-14 2:08am

Not enough information...

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Maciej Los · Answer 1 · 2014-05-20T21:07:00

Please, read my comment to the question.

Have a look here:
ALTER TABLE[^]
Create Unique Indexes[^]

Posted 20-May-14 21:07pm

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[no name] 24-May-14 20:44pm

enough for 5

Maciej Los 25-May-14 4:12am

Thank you, Bruno ;)