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Learn about SQl Constraints namely Not Null, Unique, Check, Primary Key and. CREATE table Student (s_id int PRIMARY KEY , Name varchar(60) NOT NULL, . Every now and again you realize that the primary key for a table does. Just add an additional column in order to make it unique and move on. You can add a primary key to a table when you create the . When you specify the Primary Key constraint, SQL Server enforces it by. As I have sai the Unique Clustered Index is created by default.

SQL CONSTRAINT clauses in SQL Server let you control what kinds of values. CREATE TABLE statement defines the primary key on the StoreID and . IDENTITY(1) PRIMARY KEY ,. How to Create Tables and Insert Data into SQL Databases. The PRIMARY KEY forces every row to be a unique value.

A primary key is a guaranteed unique identifier for a row in a table.