Monthly Archives: August 2009

Sql server Constraints – Primary Key, Foreign Key, Unique Key, Not Null, Check Constraints

By | August 19, 2009

Introduction A constraint is a property that is assigned to a column or a group of columns to prevent incorrect or corrupt data from entering into the tables. These constraints ensure the accuracy and reliability of the data into the tables. This article will tell about the Sql server Constraints – Primary Key, Foreign Key,… Read More »