Anonymous
Anonymous Asked in Cars &Transportation · 2 weeks ago

What is the main difference between primary key and unique key?

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Both Primary key and Unique Key are used to uniquely define of a row in a table. Primary Key creates a clustered index of the column whereas a Unique creates an unclustered index of the column . A Primary Key doesn't allow NULL value , however a Unique Key does allow one NULL value . 22 сент. 2014 г.


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