Foreign keys establish relationships between tables from "summary" of SQL and Relational Theory by C. Date
It's crucial to understand the role of foreign keys in SQL databases. Foreign keys are used to establish relationships between tables, linking rows in one table to rows in another. This relationship is fundamental to maintaining the integrity and consistency of the data within the database. When a foreign key is defined in a table, it creates a constraint that enforces referential integrity. This means that the values in the foreign key column must correspond to values in the primary key column of another table. This ensures that there are no orphaned rows or inconsistencies in ...
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