A key is a field, or combination of fields, in a database table used to retrieve and sort rows in the table based on certain requirements.
Keys are defined to speed up access to data and, in many cases, to create links between different tables.
This article uses material from the Wikipedia Simple English article Key (computer), which is released under the Creative Commons Attribution-ShareAlike 3.0 license ("CC BY-SA 3.0"); additional terms may apply (view authors). Content is available under CC BY-SA 4.0 unless otherwise noted. Images, videos and audio are available under their respective licenses.
®Wikipedia is a registered trademark of the Wiki Foundation, Inc. Wiki Simple English (DUHOCTRUNGQUOC.VN) is an independent company and has no affiliation with Wiki Foundation.