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