-- 用户名用双引号括起来，同时注意 a-admin 用户名的大小写哦：

sys@TDODS> create user "a-admin" identified by bee;

User created.

Elapsed: 00:00:00.13
sys@TDODS> alter user a-admin account unlock;
alter user a-admin account unlock
            *
ERROR at line 1:
ORA-00922: missing or invalid option


Elapsed: 00:00:00.00
sys@TDODS> select username, account_status from dba_users where username='a-admin';

USERNAME               ACCOUNT_STATUS
------------------------------ --------------------------------
a-admin                OPEN

Elapsed: 00:00:00.00
sys@TDODS> alter user "a-admin" account unlock;

User altered.

Elapsed: 00:00:00.01
sys@TDODS> select username, account_status from dba_users where username='a-admin';

USERNAME               ACCOUNT_STATUS
------------------------------ --------------------------------
a-admin                OPEN

Elapsed: 00:00:00.00