1set session debug="L";
2select @@global.debug="1";
3@@global.debug="1"
40
5select @@session.debug;
6@@session.debug
7L
8show global variables like 'debug';
9Variable_name	Value
10debug	#
11show session variables like 'debug';
12Variable_name	Value
13debug	L
14select * from information_schema.global_variables where variable_name="debug";
15VARIABLE_NAME	VARIABLE_VALUE
16DEBUG	#
17select * from information_schema.session_variables where variable_name="debug";
18VARIABLE_NAME	VARIABLE_VALUE
19DEBUG	L
20set @@global.debug=1;
21ERROR 42000: Incorrect argument type to variable 'debug'
22set @@global.debug=1.1;
23ERROR 42000: Incorrect argument type to variable 'debug'
24set @@global.debug=1e1;
25ERROR 42000: Incorrect argument type to variable 'debug'
26