What is the method to query the character set of an Oracle database?

You can use the following SQL query to check the character set of an Oracle database.

SELECT parameter, value
FROM nls_database_parameters
WHERE parameter = 'NLS_CHARACTERSET';

This query will return the character set information of the database. The NLS_CHARACTERSET parameter contains the database’s character set settings. You can retrieve the value of this parameter through the above query to obtain information on the character set currently being used by the database.