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MySQL 5.7 Reference Manual
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13.7.3.2 DROP FUNCTION Syntax

DROP FUNCTION function_name

This statement drops the user-defined function (UDF) named function_name.

To drop a function, you must have the DELETE privilege for the mysql database. This is because DROP FUNCTION removes a row from the mysql.func system table that records the function's name, type, and shared library name.

Note

To upgrade the shared library associated with a UDF, issue a DROP FUNCTION statement, upgrade the shared library, and then issue a CREATE FUNCTION statement. If you upgrade the shared library first and then use DROP FUNCTION, the server may crash.

DROP FUNCTION is also used to drop stored functions (see Section 13.1.27, “DROP PROCEDURE and DROP FUNCTION Syntax”).


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