An index that is based on two or more columns (fields) in a database table. For example, a common concatenated index would be LastName+FirstName.
"concatenated index." YourDictionary, n.d. Web. 18 August 2018. <http://www.yourdictionary.com/concatenated-index>.
concatenated index. (n.d.). Retrieved August 18th, 2018, from http://www.yourdictionary.com/concatenated-index