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A _________ that is set on one or more columns in a table that ensures the data in each row is unique within the table for that column or combination of columns; A unique _________ allows NULL values and therefore cannot be used to uniquely identify

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1. A _________ that is set on one or more columns in a table that ensures the data in each row is unique within the table for that column or combination of columns; A unique _________ allows NULL values and therefore cannot be used to uniquely identify





 
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