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There is no such thing in SQL. I even googled it right now because the concept makes no sense. I didn't find any page on T-SQL about secondary keys. Please correct me if I'm wrong.
There is a primary key, which is unique, indexed, and in mssql - clustered.
There are foreign keys - attributes that refer to a primary key in a table.
There is also unique keys, which can be used with primary keys together.
And that's all the keys.
Other structures include indexes, but they are not keys (not related to unique rows).
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