what is Primary Key in SQL Server
Interview question and answer by:
Sriramnandha | Posted on: 6/3/2012 | Category:
SQL Server Interview questions | Views: 594 | |
Points: 40
Answer:
A Primary Key in a table uniquely identifies each and every row with out allowing Nulls. There are two types of Primary Keys:
1) Simple Primary Key ==> Defining primary key on a single column is called Simple Primary Key.
2) Composite Primary Key ==> Defining Primary Key on more than one column is called Composite Primary Key.
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