A foreign key is a column or set of columns in one table that refers to the primary key in another table. It establishes a link between the two tables.
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Relational databases use tables to store data, where each table is made up of rows and columns. Relationships between data entities are a fundamental part of the relational model.
A relational database organizes data into tables, where each table consists of rows and columns. This model uses relationships between tables to manage and retrieve data efficiently.
The primary key is a unique identifier for each row in a table. It ensures that no two rows have the same value in the primary key column(s).
