In this post, I am sharing a script to find all the tables without having a Primary Key in a database of SQL Server.

This script is very important because Primary Key is a one of a major part of the table. I never recommended like creating a table without Primary Key.

Best practice for Primary Key in Database Management System

Using below script, I found all the tables that do not have a primary key and which are created by other database development team, so I was finding and adding missing Primary Keys.

Below are two different scripts:

SELECT
	SCHEMA_NAME(schema_id) AS SchemaName
	,Name AS TableName
FROM sys.objects
WHERE [type]='U' 
	AND object_id NOT IN 
	(
		SELECT parent_object_id FROM sys.objects
		WHERE [type]='PK'
	)
GO

SELECT
	SCHEMA_NAME(schema_id) AS SchemaName
	,Name AS TableName
FROM sys.tables
WHERE OBJECTPROPERTY(object_id,'TableHasPrimaryKey') = 0
GO