In DB2, a UNIQUE constraint ensures that ________.
- Data types are consistent across tables.
- Each value in a column or set of columns is unique.
- Null values are allowed in specified columns.
- The table has a primary key constraint.
The UNIQUE constraint in DB2 ensures that each value in a specified column or set of columns is unique across all the rows in the table. It prevents duplicate values from being entered into the table.
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