How to create Primary key Constraint in sql | Basic Concept of Primary key Constraint | SQL PK
Hello all of you
Welcome to tutorial on Primary key key Constraints in SQL
In this tutorial we will try to know the basic concept of priamry key.
PRIMARY KEY Constraint
PRIMARY KEY constraint uniquely identifies each record in a table.
PRIMARY KEY is a candidate key and this candidate key helps to make uniqueness in a whole table.
Primary keys must contain UNIQUE values, and cannot contain NULL values.
SQL Syntax:
Table_Column_Name DataType NOT NULL PRIMARY KEY
So, let's go to the query window to see how to use primary key constraint..
CREATE TABLE [dbo].[CustomerInfo]
(
[CustomerId] [int] NOT NULL PRIMARY KEY IDENTITY(1,1),
[FirstName] [nvarchar](50) NOT NULL,
[LastName] [NVARCHAR](50) NULL,
[Age] [int] NULL
)
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