Discuss how Oracle queries table permissions

Oracle is a common database management system that is widely used in various fields. In Oracle, tables are the basic unit of data storage, and table permissions are a very important concept when using Oracle database. Today we will discuss how to query table permissions.

First of all, we need to understand the table permissions in Oracle. In Oracle, table permissions include SELECT, INSERT, UPDATE and DELETE. Among them:

• SELECT: Query the data in the table.
• INSERT: Insert data into the table.
• UPDATE: Modify the data in the table.
• DELETE: Delete data in the table.

Before querying table permissions, we need to confirm what permissions the current user has. You can view all the permissions of the current user through the following SQL statement:

SELECT * FROM USER_SYS_PRIVS;

After executing this SQL statement, you can see what system permissions the current user has, such as CREATE SESSION, CREATE TABLE, CREATE VIEW, etc. If we want to view the table permissions owned by the current user, we can execute the following SQL statement:

SELECT * FROM USER_TAB_PRIVS;

After executing this SQL statement, the table permissions owned by the current user and their specific permission types will be listed. For example, the current user may have SELECT permissions on a table, but does not have INSERT, UPDATE, and DELETE permissions.

If we want to query the permissions of a specific table, we can query it through the following SQL statement:

SELECT * FROM USER_TAB_PRIVS WHERE TABLE_NAME = 'table_name';

Among them, table_name is the name of the table we want to query the permissions. After executing the SQL statement, all permissions the current user has in the table will be listed.

In addition, there are some other table permission query statements in Oracle, such as:

• ALL_TAB_PRIVS: Query the table permissions owned by the current user and all roles.
• DBA_TAB_PRIVS: Query the table permissions owned by all users and roles.
• ROLE_TAB_PRIVS: Query the table permissions owned by the role.

In short, when using Oracle for table operations, it is very important to understand table permissions. We can use the methods introduced above to view and query the table permissions owned by the current user and the permissions of a specific table, so that we can better control and manage our data.

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