What are unique keys in SQL?
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What are unique keys in SQL?
Unique keys are constraints that ensure all values in a column are distinct from one another.
How do unique keys differ from primary keys?
A primary key uniquely identifies a record and cannot be null, while a unique key can accept null values.
Can a table have multiple unique keys?
Yes, a table can have multiple unique keys, each enforcing uniqueness on different columns.
What happens if I try to insert a duplicate value in a unique key column?
The database will reject the insert operation and return an error indicating a violation of the unique constraint.
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