Define a primary key in the SQL Server Database Engine by using SQL Server Management Studio or Transact-SQL. Creating a new table with a primary key requires CREATE TABLE permission in the database ...

If you are working with SQL DB2, you may need to create tables that have primary and foreign keys to enforce data integrity and establish relationships between different entities.

Creating a table named “Employee” with ID as the primary key. The above code has created a table named “Employee” with an ID field, a unique identifier as a primary key. Now in this table, a clustered ...

To modify a primary key. To modify a PRIMARY KEY constraint using Transact-SQL, you must first delete the existing PRIMARY KEY constraint and then re-create it with the new definition. For more ...