Foreign key A foreign key is a primary key from one table that appears in another table to link the two together.

Sytze Harkema explains how to save and retrieve relational SQL data into a NoSQL key-value store as implemented by FoundationDB, an open source, scalable, fault tolerant and ACID database.

For National 5 Computing Science, revise the use of primary and foreign keys and the difference between flat file and relational databases.

I have a foreign key constraint that I created to reference the primary key of another table:constraint geneassay_fk foreign key (geneassay) references ...

A foreign key integrity constraint links the data values of one or more variables in its data file to those of the variables specified in a primary key, and controls the action that can be taken when ...

Can you do a foreign key within a single table, though? I've only ever seen foreign key constraints tying a field in one table to a field in another table.

For everyone normalizing their designs, just remember: There ain't no such thing as a partial foreign key. When a project pretends that partial foreign keys are a valid concept, the end result is a ...