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select @@global.rand_seed2; ERROR HY000: Variable 'rand_seed2' is a SESSION variable select @@session.rand_seed2; @@session.rand_seed2 0 show global variables like 'rand_seed2'; Variable_name Value show session variables like 'rand_seed2'; Variable_name Value rand_seed2 0 select * from information_schema.global_variables where variable_name='rand_seed2'; VARIABLE_NAME VARIABLE_VALUE select * from information_schema.session_variables where variable_name='rand_seed2'; VARIABLE_NAME VARIABLE_VALUE RAND_SEED2 0 set session rand_seed2=1; select @@session.rand_seed2; @@session.rand_seed2 0 select * from information_schema.global_variables where variable_name='rand_seed2'; VARIABLE_NAME VARIABLE_VALUE select * from information_schema.session_variables where variable_name='rand_seed2'; VARIABLE_NAME VARIABLE_VALUE RAND_SEED2 0 set global rand_seed2=1; ERROR HY000: Variable 'rand_seed2' is a SESSION variable and can't be used with SET GLOBAL set session rand_seed2=1.1; ERROR 42000: Incorrect argument type to variable 'rand_seed2' set session rand_seed2=1e1; ERROR 42000: Incorrect argument type to variable 'rand_seed2' set session rand_seed2="foo"; ERROR 42000: Incorrect argument type to variable 'rand_seed2'