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.

Learn how to create, test, validate, and optimize foreign keys in SQL Server using queries and tools. Improve your data quality and integrity with foreign keys. Skip to main content LinkedIn ...

/* The PRIMARY KEY constraint uniquely identifies each record in a table. Primary keys must contain UNIQUE values, and cannot contain NULL values. A table can have only ONE primary key; and in the ...