1select @@global.datetime_format;
2@@global.datetime_format
3%Y-%m-%d %H:%i:%s
4Warnings:
5Warning	1287	'@@datetime_format' is deprecated and will be removed in a future release.
6select @@session.datetime_format;
7ERROR HY000: Variable 'datetime_format' is a GLOBAL variable
8show global variables like 'datetime_format';
9Variable_name	Value
10datetime_format	%Y-%m-%d %H:%i:%s
11show session variables like 'datetime_format';
12Variable_name	Value
13datetime_format	%Y-%m-%d %H:%i:%s
14select * from information_schema.global_variables where variable_name='datetime_format';
15VARIABLE_NAME	VARIABLE_VALUE
16DATETIME_FORMAT	%Y-%m-%d %H:%i:%s
17select * from information_schema.session_variables where variable_name='datetime_format';
18VARIABLE_NAME	VARIABLE_VALUE
19DATETIME_FORMAT	%Y-%m-%d %H:%i:%s
20set global datetime_format="foo";
21ERROR HY000: Variable 'datetime_format' is a read only variable
22set session datetime_format="foo";
23ERROR HY000: Variable 'datetime_format' is a read only variable
24