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An index can't exist on a blank column. (Visual Database Tools)
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An index can't exist on a blank column. (Visual Database Tools)

An index must contain at least one column, and that column must contain unique data values if you are creating a unique index. The column names selected must be entered under Column name in the Selected index box.

For more information, see Creating Indexes (Database Engine) and How to: Create Indexes (Visual Database Tools).

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