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.

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