MySQL 8.4 Release Notes
15.1.26 删除函数语句
The DROP FUNCTION statement is used to drop stored functions and loadable functions:
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For information about dropping stored functions, see Section 15.1.29, “DROP PROCEDURE and DROP FUNCTION Statements”.
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For information about dropping loadable functions, see Section 15.7.4.2, “DROP FUNCTION Statement for Loadable Functions”.