Why we use Primary Key
Hi,
As I know " Primary Key = Unique Key + Not Null " , then why we use Primary key instead of Unique Key + Not Null.
I know One difference i.e.
Primary key creates the Clustered index but unique key creates the Non clustered index.
Is there any other difference .
Thanks
As I know " Primary Key = Unique Key + Not Null " , then why we use Primary key instead of Unique Key + Not Null.
I know One difference i.e.
Primary key creates the Clustered index but unique key creates the Non clustered index.
Is there any other difference .
Thanks
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