How to query tables in the current database using Oracle?

To query tables in the current Oracle database, you can use the following SQL query statement:

SELECT table_name FROM all_tables;

The above query will return the names of all tables under the current user (or schema). If you want to query tables under other users (or schemas), you can replace `all_tables` with `user_tables` and specify the username, for example:

SELECT table_name FROM user_tables WHERE owner = '<username>';

`` is the name of the specific user you want to search for.

These queries will retrieve a list of table names, allowing you to then query the structure and data of each table as needed.