UPDATE GLOBALSETTINGS
   SET settingValue = case
                        when settingName = 'SessionTTL'  then '40'
                        when settingName = 'MaxUsersActive'  then '50'
                        else settingValue
                      end
WHERE settingName in ('SessionTTL', 'MaxUsersActive');

//The result:

Error starting at line 1 in command:
UPDATE GLOBALSETTINGS
   SET settingValue = case
                        when settingName = 'SessionTTL'  then '40'
                        when settingName = 'MaxUsersActive'  then '50'
                        else settingValue
                      end
WHERE settingName in ('SessionTTL', 'MaxUsersActive')
Error at Command Line:7 Column:6
Error report:
SQL Error: ORA-00904: "SETTINGNAME": invalid identifier
00904. 00000 -  "%s: invalid identifier"
*Cause:
*Action: