Why can't I change the engine?

see here:

https://www.jb51.net/article/.

I change the engine

mysql> alter table num  type = MyISAM;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near "type = MyISAM" at line 1
mysql> alter table num  type = Myisam;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near "type = Myisam" at line 1

there is already data in this table, can"t it be modified in this way?

May.08,2021

ALTER TABLE num ENGINE=MYISAM

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e3f50c-44067.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3f50c-44067.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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