Main Page | See live article | Alphabetical index A key field is a field of a database (typically a relational database) table which together form a unique identifier for a record (a table entry). The aggregate of these fields is usually referred to simply as "the key". ''This article was originally based on material from FOLDOC, used with permission. Update as needed.'' This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.