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When you create a table with the CREATE TABLE statement, you become its owner and receive full privileges for the table (SELECT, INSERT, DELETE, UPDATE, and any other privileges supported by the DBMS). Other users initially have no privileges on the newly created table. If they are to be given access to the table, you must explicitly grant privileges to them by using the GRANT statement. When you create a view with the CREATE VIEW statement, you become the owner of the view, but you do not necessarily receive full privileges on it. To create the view successfully, you must already have the SELECT privilege on each of the source tables for the view; therefore, the DBMS gives you the SELECT privilege for the view automatically. For each of the other privileges (INSERT, DELETE, and UPDATE), the DBMS gives you the privilege on the view only if you hold that same privilege on every source table for the view.
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Part IV:
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Many commercial DBMS products offer additional table and view privileges beyond the basic SELECT, INSERT, DELETE, and UPDATE privileges. For example, Oracle and the IBM mainframe databases support an ALTER and an INDEX privilege for tables. A user with the ALTER privilege on a particular table can use the ALTER TABLE statement to modify the definition of the table; a user with the INDEX privilege can create an index for the table with the CREATE INDEX statement. In DBMS brands that do not support the ALTER and INDEX privileges, only the owner may use the ALTER TABLE and CREATE INDEX statements. Additional privileges are frequently supported for DBMS security objects other than tables and views. For example, Oracle, Sybase, and SQL Server support an EXECUTE privilege for stored procedures, which determines whether a user is allowed to execute a stored procedure. DB2 supports a USE privilege for tablespaces, which determines whether a user can create tables in a specific tablespace.
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In addition to the restrictions on table access provided by the SQL privileges, views also play a key role in SQL security. By carefully defining a view and giving a user permission to access the view but not its source tables, you can effectively restrict the user s access to only selected columns and rows. Views thus offer a way to exercise very precise control over what data is made visible to which users. For example, suppose you wanted to enforce this security rule in the sample database: Accounts receivable personnel should be able to retrieve employee numbers, names, and of ce numbers from the SALESREPS table, but data about sales and quotas should not be available to them. You can implement this security rule by defining a view as follows:
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CREATE VIEW REPINFO AS SELECT EMPL_NUM, NAME, REP_OFFICE FROM SALESREPS;
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and giving the SELECT privilege for the view to the ARUSER user-id, as shown in Figure 15-3. This example uses a vertical view to restrict access to specific columns. Horizontal views are also effective for enforcing security rules such as this one: The sales managers in each region should have full access to SALESREPS data for the salespeople assigned to that region. As shown in Figure 15-4, you can define two views, EASTREPS and WESTREPS, containing SALESREPS data for each of the two regions, and then grant each office manager access to the appropriate view. Of course, views can be much more complex than the simple row and column subsets of a single table shown in these examples. By defining a view with a grouped query, you can give a user access to summary data but not to the detailed rows in the underlying table. A view can also combine data from two or more tables, providing precisely the data needed by a particular user and denying access to all other data. The usefulness of views for
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