What Is A Unique Constraint?

1.	What Is A Unique Constraint?
Answer» Unique constraint is imposed on the COLUMN data to avoid DUPLICATE values, but it will contain NULL values. Unique constraint is imposed on the column data to avoid duplicate values, but it will contain NULL values.

Answer»

Unique constraint is imposed on the COLUMN data to avoid DUPLICATE values, but it will contain NULL values.

Unique constraint is imposed on the column data to avoid duplicate values, but it will contain NULL values.

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