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Stored Functions

A stored function is a defined function that is called from within an SQL statement like a regular function, and returns a single value.

Title	Description
Stored Function Overview	Function called from within an SQL statement, returning a single value
Stored Routine Privileges	Privileges associated with stored functions and stored procedures.
CREATE FUNCTION	Creates a stored function.
ALTER FUNCTION	Change the characteristics of a stored function.
DROP FUNCTION	Drop a stored function.
SHOW CREATE FUNCTION	Statement that created the function
SHOW FUNCTION STATUS	Stored function characteristics
SHOW FUNCTION CODE	Representation of the internal implementation of the stored function
Stored Aggregate Functions	Custom aggregate functions.
Binary Logging of Stored Routines	Stored routines require extra consideration when binary logging.
Stored Function Limitations	Restrictions applying to stored functions
Information Schema ROUTINES Table	Stored procedures and stored functions information

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https://mariadb.com/kb/en/stored-functions/