Query permissions for oracle query table

In Oracle database, table is one of the most common objects in the database. A large amount of critical data is stored in the table, so protecting the data in the table is crucial. To control access to tables, Oracle Database provides many methods and tools. One of them is the query permission for the query table. In this article, we will explore how to query the query permissions of a table in an Oracle database.

1. What is query permission

Query permission refers to the permission for a user or role to query a table. It determines who can query the table and how. In Oracle database, query permissions can be associated with specific users or roles. These permissions include SELECT permissions and other query privileges.

2. How to query the query permissions of the table

In the Oracle database, the query permissions of the query table can be queried through the following methods:

2.1. Using SYS .USER_TAB_PRIVS view

The SYS.USER_TAB_PRIVS view stores user or role permissions on database objects, including table query permissions. To query the query permissions of a table, use the following SQL statement:

SELECT * FROM SYS.USER_TAB_PRIVS WHERE TABLE_NAME = 'table_name';

In this query, we will use the SYS.USER_TAB_PRIVS view to obtain all permissions of a user or role on the table. In the WHERE clause, we want to replace 'table_name' with the name of the actual table.

2.2. Using the DBA_TAB_PRIVS view

In the Oracle database, the DBA_TAB_PRIVS view stores the permission information of all objects in the database. To query the query permissions of a table, use the following SQL statement:

SELECT * FROM DBA_TAB_PRIVS WHERE OWNER = 'owner_name' AND TABLE_NAME = 'table_name' AND PRIVILEGE = 'SELECT';

In this In the query, we will use the DBA_TAB_PRIVS view to obtain query permissions for the specified table. In the WHERE clause, we want to replace 'owner_name' with the name of the owner of the table, 'table_name' with the actual name of the table, and the 'PRIVILEGE' column is set to 'SELECT'.

3. Manage table query permissions

In Oracle database, table query permissions can be managed by granting or revoking SELECT permissions. To grant SELECT permission on a table, you can use the following SQL statement:

GRANT SELECT ON table_name TO user_or_role;

In this statement, we use the GRANT statement to grant the user or role SELECT on the table permissions. In the statement, 'table_name' is the actual name of the table, and 'user_or_role' is the user or role to which SELECT permissions are to be granted.

To revoke the SELECT permission of the table, you can use the following SQL statement:

REVOKE SELECT ON table_name FROM user_or_role;

In this statement, we use the REVOKE statement from the user Or revoke the SELECT permission on the table in the role. In the statement, 'table_name' is the actual name of the table, and 'user_or_role' is the user or role whose SELECT privileges were revoked.

4. Conclusion

Oracle database provides a variety of methods and tools to manage query permissions on tables. Understanding how to query and grant permissions is key to protecting sensitive data in your database. By using the SYS.USER_TAB_PRIVS view and DBA_TAB_PRIVS view, users can easily query the query permissions of the table. A user or administrator can maintain query permissions on a table by granting or revoking SELECT permissions. In Oracle database, protecting the data security of tables is always crucial.

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