key LastModified: Wednesday, August 08, 2007
(1) A button on a keyboard. (2) In database management systems, a key is a field that you use to sort data. It can also be called a key field , sort key, index, or key word. For example, if you sort records by age, then the age field is a key. Most database management systems allow you to have more than one key so that you can sort records in different ways. One of the keys is designated the primary key, and must hold a unique value for each record. A key field that identifies records in a different table is called a foreign key. (3) A password or table needed to decipher encoded data. (4) See memory keys.
	related categories: Data Databases Digital Rights Management (DRM) Encryption Keyboards Memory related terms: backdoor database management system dead key encryption field hashing index key escrow key length memory keys normalization password referential integrity symmetric-key cryptography Shopping key Products Compare Products,Prices and Stores Shop by Category: Auto Parts and Accessories 13396 Store Offers Sport and Outdoor 48885 Store Offers Tools and Accessories 5221 Store Offers Building Supplies 55383 Store Offers Musical Instruments 2601 Store Offers