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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.
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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.
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