SQL 命令DDL 命令用户自定义函数DROP FUNCTION在本页DROP FUNCTIONDrop an existing user-defined function.SyntaxDROP FUNCTION [IF EXISTS] <name>ExamplesDROP FUNCTION a_plus_3;SELECT a_plus_3(2);ERROR 1105 (HY000): Code: 2602, displayText = Unknown Function a_plus_3 (while in analyze select projection).