In Oracle and MySQL, the CREATE USER statement creates a new user, but some clauses differ and require conversion.
Oracle:
-- Create a sample user CREATE USER "USER1" IDENTIFIED BY VALUES 'S:E4406C13C44...;H:6AE38B92223...;T:B99DEE30A...' DEFAULT TABLESPACE "TBS_DATA" TEMPORARY TABLESPACE "TEMP" PROFILE "USER_PROFILE" PASSWORD EXPIRE;
MariaDB:
-- Create a sample user CREATE USER "USER1" IDENTIFIED BY '<password>' PASSWORD EXPIRE;
Note that you cannot reuse the hash value specified in the IDENTIFIED BY VALUES clause in Oracle when converting to MariaDB. You have to replace it with a password or another hash value appropriate for a MariaDB authentication plugin.
For more information, see Oracle to MariaDB Migration.