What is the Primary Key?
Primary Key is a unique constraint that identifies unique records in the table. The primary Key must have unique and can not hold null values. The table has only one Primary Key in one table.
1.Script For Creating Primary Key?
Create table tblEmployee
(
ID int primary key identity(1,1),
Name nvarchar(50),
Email nvarchar(20),
Gender nvarchar(20),
City nvarchar(20)
)
(
ID int primary key identity(1,1),
Name nvarchar(50),
Email nvarchar(20),
Gender nvarchar(20),
City nvarchar(20)
)
2. Creating Primary Key Graphically On SQL Server Management Studio.
1. Right-click on Tables.
2.Fill in all columns and right-click on the ID column and select set Primary Key.
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