create database mysqltest1;
use mysqltest1;
create table t1(id int primary key);
create definer=unknownuser@'%' sql security definer view v1 as select t1.id from t1 group by t1.id;
Warnings:
Note	1449	The user specified as a definer ('unknownuser'@'%') does not exist
show table status;
Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment	Max_index_length	Temporary
t1	MyISAM	10	Fixed	0	0	0	#	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL			#	N
v1	NULL	NULL	NULL	NULL	NULL	NULL	#	NULL	NULL	NULL	#	#	NULL	NULL	NULL	NULL	VIEW	#	NULL
Warnings:
Note	1449	The user specified as a definer ('unknownuser'@'%') does not exist
drop database mysqltest1;