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A key is a single or combination of multiple fields in a table. It is used to fetch or retrieve records/data rows from the data table according to the condition/requirement.
keys such as super key, candidate key, primary key, foreign key, alternate key, compound key, composite key, and so on.
In SQL Server, we have two keys which distinctively or uniquely identify a record in the database. Both the keys seem identical, but actually, both are different in features and in behaviours. In this article, I would like to share the key differences between primary key and unique key.
In SQL Server, there are two keys - primary key and foreign key which seems identical, but actually both are different in features and behaviours. In this article, I would like to share the key differences between primary key and foreign key.