How do you query the current database using sqlplus?

To query the current database, you can use the following steps:

1. Open the command prompt or terminal window.
2. Open the SQL*Plus command line interface.
3. Enter valid database connection information at the SQL*Plus prompt, for example:

SQL> connect username/password@database

In this case, username is the database username to connect, password is the user’s password, and database is the database instance name to connect to.

1. After successfully establishing a connection, you can use the following command to query the current database:

SQL> select name from v$database;

This will return the name of the current database.

Please note that the above steps assume that you have correctly installed and configured SQL*Plus, and have provided valid database connection information.