c# and SQL interview question Video :- What is the difference between unique key and primary key?
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- Unique key can have nulls .Primary key cannot have nulls.
- In a single table we can create multiple unique keys.In a single table we can have only one primary key.
- Unqiue key creates a non-clustered index by default.Primary Key created a clustered index by default.
- Both unique keys and primary keys can be referenced by foreign key.
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