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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 implementing SQL security is limited by the two fundamental restrictions described earlier in 14: I Update restrictions. The SELECT privilege can be used with read-only views to limit data retrieval, but the INSERT, DELETE, and UPDATE privileges are meaningless for these views. If a user must update the data visible in a read-only view, the user must be given permission to update the underlying tables and must use INSERT, DELETE, and UPDATE statements that reference those tables. I Performance. Because the DBMS translates every access to a view into a corresponding access to its source tables, views can add significant overhead to database operations. Views cannot be used indiscriminately to restrict database access without causing overall database performance to suffer.

Granting Privileges (GRANT)

The DISTINCT is not absolutely necessary, but it makes the list of values in the subselect much shorter, which makes the statement far more ef cient.

The basic GRANT statement, shown in Figure 15-5, is used to grant security privileges on database objects to specific users. Normally, the GRANT statement is used by the owner of a table or view to give other users access to the data. As shown in the figure, the GRANT statement includes a specific list of the privileges to be granted, the name of the table to which the privileges apply, and the user-id to which the privileges are granted. The GRANT statement shown in the syntax diagram conforms to the ANSI/ISO SQL standard. Many DBMS brands follow the DB2 GRANT statement syntax, which is more flexible. The DB2 syntax allows you to specify a list of user-ids and a list of tables, making it simpler to grant many privileges at once. Here are some examples of simple GRANT statements for the sample database: Give order-processing users full access to the ORDERS table.

Figure 15-5.

15:

Flagsol Flachglas Solartechnik GmBH Muhlengasse 7 D-50667 Cologne Germany Tel: 49-(0)-221-257-3811 Fax: 49-(0)-221-258-1117 Sch co International Whitehall Avenue, Kingston Milton Keynes MK10 0AL UK Tel: 44-(0)-1908-282111 Fax: 44-(0)-1908-282124

Let accounts receivable users retrieve customer data and add new customers to the CUSTOMERS table, but give order-processing users read-only access.

References to gures and illustrations are in italics. % (percent), 103 _ (underscore), 103 <> (not equal operator), 140 , (commas), 46 - (hyphens), 46 ; (semicolons), 45 (single quotes), 46 autocommit mode, 207, 208, 209, 210 AutoNumber data type, 61

For convenience, the GRANT statement provides two shortcuts that you can use when granting many privileges or when granting them to many users. Instead of specifically listing all of the privileges available for a particular object, you can use the keywords ALL PRIVILEGES. This GRANT statement gives Sam Clark, the vice president of sales, full access to the SALESREPS table: Give all privileges on the SALESREPS table to Sam Clark.

Instead of giving privileges to every user of the database one-by-one, you can use the keyword PUBLIC to grant a privilege to every authorized database user. This GRANT statement lets anyone retrieve data from the OFFICES table: Give all users SELECT acces to the OFFICES table.

Note that this GRANT statement grants access to all present and future authorized users, not just to the user-ids currently known to the DBMS. This eliminates the need for you to explicitly grant privileges to new users as they are authorized.

The SQL1 standard allows you to grant the UPDATE privilege for individual columns of a table or view, and the SQL2 standard allows a column list for INSERT and REFERENCES privileges as well. The columns are listed after the UPDATE, INSERT, or REFERENCES keyword and enclosed in parentheses. Here is a GRANT statement that allows the orderprocessing department to update only the company name and assigned salesperson columns of the CUSTOMERS table: Let order-processing users change company names and salesperson assignments.