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The UNIQUE constraint differs from the PRIMARY KEY constraint in what way? The UNIQUE constraint does not allow NULL values. The UNIQUE constraint can be
The UNIQUE constraint differs from the PRIMARY KEY constraint in what way?
The UNIQUE constraint does not allow NULL values.
The UNIQUE constraint can be created at either the column level or the table level.
The UNIQUE constraint allows NULL values.
The UNIQUE constraint ensures that a specific condition is true before a data value is added to a table.
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Database Design Using Entity Relationship Diagrams
Authors: Sikha Saha Bagui, Richard Walsh Earp
3rd Edition
103201718X, 978-1032017181
