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select @@global.datetime_format;
@@global.datetime_format
%Y-%m-%d %H:%i:%s
select @@session.datetime_format;
ERROR HY000: Variable 'datetime_format' is a GLOBAL variable
show global variables like 'datetime_format';
Variable_name Value
datetime_format %Y-%m-%d %H:%i:%s
show session variables like 'datetime_format';
Variable_name Value
datetime_format %Y-%m-%d %H:%i:%s
select * from information_schema.global_variables where variable_name='datetime_format';
VARIABLE_NAME VARIABLE_VALUE
DATETIME_FORMAT %Y-%m-%d %H:%i:%s
select * from information_schema.session_variables where variable_name='datetime_format';
VARIABLE_NAME VARIABLE_VALUE
DATETIME_FORMAT %Y-%m-%d %H:%i:%s
set global datetime_format="foo";
ERROR HY000: Variable 'datetime_format' is a read only variable
set session datetime_format="foo";
ERROR HY000: Variable 'datetime_format' is a read only variable
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