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Functional indexes store the result of an expression rather than a value from a database column (or columns).
In this video, we discuss an example of where this may be helpful and demonstrate the syntax of creating a functional index in MySQL.
Functional Index Documentation:
– https://dev.mysql.com/doc/refman/8.0/en/create-index.html#create-index-functional-key-parts
Date: June 27, 2023