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create role hr_manager; grant hr_senior to hr_manager with admin option; grant all on hrregions to hr_manager; grant all on hrlocations to hr_manager; grant all on hrcountries to hr_manager; grant all on hrdepartments to hr_manager; grant all on hrjob_history to hr_manager; grant all on hrjobs to hr_manager; grant all on hremployees to hr_manager;

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This third role is given the HR_SENIOR role with the ability to pass it on, and then gets full control over the contents of all the tables But note that the only system privilege this role has is CREATE_SESSION, acquired through HR_SENIOR, which acquired it through HR_JUNIOR Not even this role can create or drop tables; that must be done by the HR user, or an administrator with CREATE ANY TABLE and DROP ANY TABLE Note the syntax WITH ADMIN OPTION, which is the same as that for granting system privileges As with system privileges, revocation of a role will not cascade; there is no record kept of who has granted a role to whom Finally, grant the roles to the relevant staff If SCOTT is a manager, SUE is a senior clerk, and JON and ROOP are junior clerks, the flow could be as in Figure 6-8

There are at least 50 predefined roles in an Oracle database (possibly many more, depending on what options have been installed) Roles that every DBA should be aware of are CONNECT This only exists for backward compatibility In previous releases it had the system privileges necessary to create data storing objects, such as tables Now it has only the CREATE SESSION privilege

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RESOURCE Also for backward compatibility, this role can create both data objects (such as tables) and procedural objects (such PL/SQL procedures) It also includes the UNLIMITED TABLESPACE privilege DBA Has most of the system privileges, and several object privileges and roles Any user granted DBA can manage virtually all aspects of the database, except for startup and shutdown SELECT_CATALOG_ROLE Has over 2000 object privileges against data dictionary objects, but no system privileges or privileges against user data Useful for junior administration staff who must monitor and report on the database but not be able to see user data SCHEDULER_ADMIN Has the system privileges necessary for managing the Scheduler job scheduling service There is also a predefined role PUBLIC, which is always granted to every database user account It follows that if a privilege is granted to PUBLIC, it will be available to all users So following this command:

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grant select on hrregions to public;

The equality operator is generally used to illustrate the concept of restricting rows using a WHERE clause There are several alternative operators that may also be used The inequality operators like less than or greater than or equal to may be used to return rows conforming to inequality conditions The BETWEEN operator facilitates range-based comparison to test whether a column value lies between two values The IN operator tests set membership, so a row is returned if the column value tested in the condition is a member of a set of literals The pattern matching comparison operator LIKE is extremely powerful, allowing components of character column data to be matched to literals conforming to a specific pattern The last comparison operator discussed in this section is the IS NULL operator, which returns rows where the column value contains a null value These operators may be used in any combination in the WHERE clause

Limiting the rows returned by a query involves specifying a suitable WHERE clause If the clause is too restrictive, then few or no rows are returned If the conditional clause is too broadly specified, then more rows than are required are returned Exploring the different available operators should equip you with the language to request exactly those rows you are interested in Testing for equality in a condition is both natural and intuitive Such a condition is formed using the is equal to (=) operator A row is returned if the equality condition is true for that row Consider the following query: