mysql mysqldump这个指令一直报错，连dumpcourse --help都报错了，求指点mysql> mysqldump -uroot --default-character-set=utf8 course> course.sql;ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'mysqldump -uroot --default-character-set=utf8 course> course.sql' at line 1mysql> mysqldump -help;ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'mysqldump -help' at line 1mysql>