The guide provides an excellent summary of the most important rules you need to remember when creating primary key constraints in SQL Server. The 6 rules you should remember about SQL Server primary keysĭon’t forget to download your FREE 1-page Simple SQL Cheat Sheet on the SQL Server Primary Key Constraint!.The best primary key column is an automatic, ever increasing integer.Syntax for creating a primary key constraint.A discussion about database normalization.In this tutorial, we’ll discuss everything you need to know about the primary key constraint and give you several important rules you need to know when designing your tables in your database. It’s very important that you know why we need a primary key constraint on our tables and that you understand the limitations put in place on a column with a primary key constraint. You’ve likely been told that “ every table needs a primary key“.īut do you understand why we need a primary key constraint in our tables? Do you really understand what a primary key constraint does?Ī proper understanding of primary key constraints is the first step towards understanding database normalization and design. If you are new to SQL Server and the process of database design, you’ve probably heard of the need to create a primary key column in your tables.
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