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Keywords:
Column,
Index,
Constraint,
Duplicate,
Key
An in which each indexed object has a unique combination of values in its key fields.
an index allowing only a single value in a table
an index value that has the additional constraint that the set of indexed columns defines a unique row
an index where all key values are unique
An index that prevents duplicate values in the indexed column.
An index that ensures that no identical key values are stored in a table.
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