1select @@global.lower_case_table_names=20; 2@@global.lower_case_table_names=20 30 4select @@session.lower_case_table_names; 5ERROR HY000: Variable 'lower_case_table_names' is a GLOBAL variable 6SELECT @@global.lower_case_table_names in (0,1,2); 7@@global.lower_case_table_names in (0,1,2) 81 9SELECT @@global.lower_case_table_names = VARIABLE_VALUE 10FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 11WHERE VARIABLE_NAME='lower_case_table_names'; 12@@global.lower_case_table_names = VARIABLE_VALUE 131 14SELECT @@global.lower_case_table_names = VARIABLE_VALUE 15FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 16WHERE VARIABLE_NAME='lower_case_table_names'; 17@@global.lower_case_table_names = VARIABLE_VALUE 181 19set global lower_case_table_names=1; 20ERROR HY000: Variable 'lower_case_table_names' is a read only variable 21set session lower_case_table_names=1; 22ERROR HY000: Variable 'lower_case_table_names' is a read only variable 23