SQL Server Course for Beginners with 100+ examples - UPDATE Statement

The video tutorial explains key constraints in SQL, focusing on primary and foreign keys. It describes how primary keys uniquely identify records in a table, using an employee table as an example. The tutorial then introduces foreign keys, which reference primary keys in another table, and explains their role in maintaining data integrity by preventing invalid data entries. The video also covers the creation of foreign key constraints and the relationship between parent and child tables.

Describe the structure of the employee and department tables in relation to primary and foreign keys.

What is a primary key and how does it function in a table?

Explain the relationship between a primary key and a foreign key.

What is the significance of a foreign key in a child table?

How does a foreign key prevent invalid data from being inserted into a table?