Creating User Defined Functions

Creating User Defined Functions

There are many instances in which you might repeatedly use some functionality. It would be handy if you were allowed to create a function that could be used as, and when, needed.

MySQL allows you to create FUNCTIONS that can be used this way.

Syntax:

CREATE FUNCTION (argument list) RETURNS  DETERMINISTIC RETURN ();

I have chosen the method name as SUMSUM, since SUM is already available as a default function.

Now, when you use this function as below:

SELECT SUMSUM (5,6);

It results in the following:

+--------------+| SUMSUM (5,6) |+--------------+|           11 |+--------------+

In case you think that the Function created by you will be of no use henceforth, you can safely delete it with the following command.

DROP FUNCTION SUMSUM;
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