Termux MariaDB all command broken

Question

    MariaDB [(none)]> select database()
        -> ;
    +------------+
    | database() |
    +------------+
    | NULL       |
    +------------+                                          1 row in set (0.001 sec)
MariaDB [(none)]> select user();
    +-------------------+
    | user()            |
    +-------------------+
    | u0_a548@localhost |
    +-------------------+
    1 row in set (0.001 sec)
    
    MariaDB [(none)]>

I use terminal Termux in Android but very hard login in this database. My problem is not get create or insert run ask in database why? Im try use write command but all time is syntax error or nothig yet and not add on database. Please help correct this im try mysql -u $(whoami) or mysql -u root i don't know password is Termux in database MariaDB?? Why all command is broken??