Question: Suppose you have a column that is not a primary key column, but you want to ensure that there are no duplicate values, such as

Suppose you have a column that is not a primary key column, but you want to ensure that there are no duplicate values, such as a student ID. Which word can you add to the column declaration to ensure that duplicate entries will cause an error?
Suppose you have a column that is not a primary key column, but you want to ensure that there are no duplicate values, such as a student ID. Which word can you add to the column declaration to ensure that duplicate entries will cause an error?
Single
Unique
Distinct
Unusual

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