SQL CommandsDDL CommandsExternal FunctionDROP FUNCTIONOn this pageDROP FUNCTIONIntroduced or updated: v1.2.116 Drops an external function. Syntax DROP FUNCTION [ IF EXISTS ] <function_name> Examples DROP FUNCTION a_plus_3;SELECT a_plus_3(2);ERROR 1105 (HY000): Code: 2602, Text = Unknown Function a_plus_3 (while in analyze select projection).