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select @@global.time_format;
@@global.time_format
%H:%i:%s
select @@session.time_format;
ERROR HY000: Variable 'time_format' is a GLOBAL variable
show global variables like 'time_format';
Variable_name Value
time_format %H:%i:%s
show session variables like 'time_format';
Variable_name Value
time_format %H:%i:%s
select * from information_schema.global_variables where variable_name='time_format';
VARIABLE_NAME VARIABLE_VALUE
TIME_FORMAT %H:%i:%s
select * from information_schema.session_variables where variable_name='time_format';
VARIABLE_NAME VARIABLE_VALUE
TIME_FORMAT %H:%i:%s
set global time_format=1;
ERROR HY000: Variable 'time_format' is a read only variable
set session time_format=1;
ERROR HY000: Variable 'time_format' is a read only variable
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