What is the difference between primary key and unique key?

 Posted by Rajni.Shekhar on 4/17/2012 | Category: Sql Server Interview questions | Views: 2394 | Points: 40

Difference between Primary Key and Unique Key

1) Primary key creates a clustered index on column whereas unique key creates a non-clustered index on column.

2) NULL is not allow in case of primary key but in unique key one null is allowed.

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