Find Primary Key of a SQL Server Table

Here’s a quick way to find the primary key of a SQL Server 2005/2008 Table using TABLE_CONSTRAINTS

USE Northwind
go
SELECT ISKC.TABLE_SCHEMA, ISKC.TABLE_NAME, ISKC.COLUMN_NAME
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS ISTC
INNER JOIN
INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS ISKC
ON ISTC.CONSTRAINT_TYPE = 'PRIMARY KEY' AND
ISTC.CONSTRAINT_NAME = ISKC.CONSTRAINT_NAME
WHERE ISKC.TABLE_NAME = 'Employees'
ORDER BY ISKC.TABLE_NAME, ISKC.ORDINAL_POSITION

Another way that I know of is to make a join between sys.indexes, sys.index_columns and sys.columns and get the desired results.