How to query oracle username and password

In Oracle database, each user has his own username and password. If you need to query the username and password of a user, you can do so through the following methods:

1. Use the SQL*Plus command line tool to query

In Oracle, you can use SQL Plus command line tool to query username and password. Open SQLPlus and enter the following command:

SQL> SELECT username, password FROM dba_users WHERE username='<用户名>';

where, is the username you need to query. After executing this command, the system will return the user's username and encrypted password.

2. Use PL/SQL to query

If you are familiar with the PL/SQL language, you can also use PL/SQL statements to query the user name and password. For example, the following statement queries the user name and password of user SCOTT:

DECLARE
   v_username VARCHAR2(30) := 'SCOTT';
   v_password VARCHAR2(30);
BEGIN
   SELECT password INTO v_password FROM dba_users WHERE username = v_username;
   DBMS_OUTPUT.PUT_LINE('Username: ' || v_username || ' Password: ' || v_password);
END;

After executing this statement, the system will return the user name and encrypted password of user SCOTT.

It should be noted that since passwords are usually stored encrypted, the clear text password cannot be directly viewed. If you need to change the user password, it is recommended to use the ALTER USER command.

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