Foreign Keys and Database Relationships
Explore how foreign keys work in SQL to connect tables and ensure data integrity. Learn to add foreign keys using CREATE TABLE and ALTER TABLE statements and understand their role in reducing data redundancy and organizing databases effectively.
Understanding foreign keys in database
To establish a connection between two tables, the primary key of one table (also called the parent table) is utilized as a reference point within the other table. When utilized in a different table, this primary key is referred to as a foreign key. Foreign keys are instrumental in establishing relationships between tables, ensuring data coherence. Foreign keys act as bridges between tables, ensuring data integrity and logical connections.
For instance, to merge data from the recently created Product table with our modified SalesData ...