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The FROM clause in the REVOKE statement can also be compared to the GRANT statement. The only difference is that in the GRANT statement, you use the TO keyword, but in the REVOKE statement you use the FROM keyword. In either case, you must either use PUBLIC as your authorization identifier, or you must list the specific user identifiers and role names. The last elements of the statement to discuss are the RESTRICT keyword and the CASCADE keyword. You might recall these keywords from s 2, 3, and 4. If you specify RESTRICT, the privilege will not be revoked if it had been passed on to other users in other words, if there are any dependent privileges. (This would mean that the WITH GRANT OPTION had been used in the GRANT statement and that the authorization identifier that had been granted the privilege had then granted the privilege to someone else.) If you specify CASCADE, the privilege will be revoked as will any privileges that were passed on to other users.
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Vendor implementations vary. In Oracle, CASCADE must be specified as CASCADE CONSTRAINTS. In both Oracle and SQL Server, RESTRICT cannot be specified, but rather is the default behavior when CASCADE is not specified. MySQL does not allow either to be specified.
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Now let s take a look at some examples of revoking privileges. The following statement revokes a SELECT privilege that was granted to the PUBLIC authorization identifier on the AVAILABLE_CDS view:
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REVOKE SELECT ON TABLE AVAILABLE_CDS FROM PUBLIC CASCADE;
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As you can see, this statement is very similar to a GRANT statement. You must identify the privileges, the authorization identifiers, and the object. In addition, you must specify RESTRICT or CASCADE. The next example is based on privileges that have been granted on a table named CD_INVENTORY. The SALES role and ACCOUNTING role have been granted the following privileges on this table: GRANT, SELECT, and INSERT. To revoke these privileges, use the following REVOKE statement:
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REVOKE SELECT, UPDATE, INSERT ON TABLE CD_INVENTORY FROM SALES, ACCOUNTING CASCADE;
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Notice that you simply specify the privileges you want to revoke, the name of the objects, and the name of the authorization identifiers. However, since you are revoking all the privileges that had been granted, you could have simplified the statement by using the ALL PRIVILEGES keywords, as shown in the following example:
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REVOKE ALL PRIVILEGES ON TABLE CD_INVENTORY FROM SALES, ACCOUNTING CASCADE;
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6:
Managing Database Security
If you do not want to revoke all privileges, but instead want to revoke only the UPDATE and INSERT privileges, you can specify only those privileges, as shown in the following example:
REVOKE UPDATE, INSERT ON TABLE CD_INVENTORY FROM SALES, ACCOUNTING CASCADE;
You can also choose to revoke privileges for only one of the role names, rather than both. In addition, you can use the RESTRICT keyword rather than CASCADE. Now suppose the same privileges had been granted as in the preceding example but in addition to those, the WITH GRANT OPTION had been specified when granting privileges. If you want to revoke only the ability of the Sales and Accounting roles to grant privileges to other users, you can use the following statement:
REVOKE GRANT OPTION FOR ALL PRIVILEGES ON CD_INVENTORY FROM SALES, ACCOUNTING CASCADE;
This statement revokes only the ability to grant privileges; the Sales and Accounting roles still have access to the CD_INVENTORY table. If you want to revoke all their privileges, you would have to execute this statement without the GRANT OPTION FOR clause. Notice in this statement that the TABLE keyword wasn t used before the name of the table. The REVOKE statement, like the GRANT statement, doesn t require the TABLE keyword when specifying a table or view.
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