Saved Bookmarks
| 1. |
What Is Unique Key Constraint? |
|
Answer» A UNIQUE constraint enforces the UNIQUENESS of the values in a set of columns, so no DUPLICATE values are entered. The unique key constraints are used to enforce ENTITY integrity as the PRIMARY key constraints. A UNIQUE constraint enforces the uniqueness of the values in a set of columns, so no duplicate values are entered. The unique key constraints are used to enforce entity integrity as the primary key constraints. |
|