Home Articles FAQs XREF Games Software Instant Books BBS About FOLDOC RFCs Feedback Sitemap
irt.Org

foreign key

You are here: irt.org | FOLDOC | foreign key

<database> A column in a database table containing values that are also found in some primary key column (of a different table). By extension, any reference to entities of a different type.

Some RDBMSs allow a column to be explicitly labelled as a foreign key and only allow values to be inserted if they already exist in the relevant primary key column.

[Is it still a foreign key if the primary key is in a different column in the __same__ table?]

(2005-01-14)

Nearby terms: foreground « Foreign eXchange Office « Foreign eXchange Subscriber « foreign key » Foresight » for free » fork

FOLDOC, Topics, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, ?, ALL

©2018 Martin Webb