In the Oracle database, a user is authorized to query tables of other users

In an Oracle database, to authorize a user to view the tables of all other users, the following steps need to be performed:

1. Use the database administrator account to connect to the Oracle database.

2. GRANTGrant the necessary permissions to the user through the command. For example, if you want to authorize a user user1to view all other users' tables, you can execute the following command:

   GRANT SELECT ANY TABLE TO user1;
   

   This command will grant user1 SELECT ANY TABLE permission to query all user tables.

3. (Optional) If you want authorized users to only view other users' tables and not modify table structure or data, you can grant SELECTpermissions instead of SELECT ANY TABLEprivileges. For example, the following command can be executed:

   GRANT SELECT ON all_tables TO user1;
   

   This command will grant SELECT permission on the table, allowing it to view the structure and data of all users' tables, but not modify them user1.ALL_TABLES

It should be noted that for each Oracle database object, there are corresponding permissions that can control what operations users can perform. Therefore, when authorizing users, it is necessary to carefully consider which permissions need to be opened to ensure security and data integrity.