# Manage foreign keys

A foreign key is a column or columns of data in one table that refers to the unique data values - often the primary key data - in another table. **Foreign keys** link together two or more tables in a database. Syntho uses foreign keys for any data generation job, including subsetting.

Here are the articles in this section:

<table data-card-size="large" data-view="cards"><thead><tr><th></th><th data-hidden></th><th data-hidden></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Foreign key inheritance</strong></td><td></td><td></td><td><a href="/pages/9BusyijY4pD4qYUK6Fk1">/pages/9BusyijY4pD4qYUK6Fk1</a></td></tr><tr><td><strong>Add foreign keys</strong></td><td></td><td></td><td><a href="/pages/EaHlxqrwEoz5CbTBOclW">/pages/EaHlxqrwEoz5CbTBOclW</a></td></tr><tr><td><strong>Delete foreign keys</strong></td><td></td><td></td><td><a href="/pages/vtl9qj4f6jWwj0jiaFdM">/pages/vtl9qj4f6jWwj0jiaFdM</a></td></tr><tr><td><strong>Circular foreign key references</strong></td><td></td><td></td><td><a href="/pages/zoMf30sKGLZDZRD9ZdPP">/pages/zoMf30sKGLZDZRD9ZdPP</a></td></tr></tbody></table>


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