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Notice that the only required part of the syntax is the CREATE ROLE clause, which means that all you really need to do is specify a name for your role. The WITH ADMIN clause is optional and you will rarely need to use this. It is necessary only if the current user identifier/role name pair contains no null values. The clause allows you to designate either the current user identifier (CURRENT_USER) or the current role name (CURRENT_ROLE) as the authentication identifier allowed to assign the role to user identifiers or role names. If the WITH ADMIN clause is not specified, the current authentication identifier, whether the current user identifier or the current role name, is allowed to assign the role.

In order to accommodate the new executable features (i.e., the display of the area of each geographical feature) associated with the text box and the two command buttons, we add the following click-type event procedures:

You ll probably find that you rarely need to use the WITH ADMIN clause of the CREATE ROLE statement, particularly as a beginning SQL programmer, and it isn t widely supported in RDBMS products. As a result, I keep my discussion of the clause brief.

Now let s look at creating a role. In the following example, I use the CREATE ROLE statement to create the CUSTOMERS role:

CREATE ROLE CUSTOMERS;

FIGURE 6-1.

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That s all there is to it. Once the role is created, you can grant the role to user identifiers or other role names. I discuss granting and revoking roles in the Grant and Revoke Roles section later in this chapter. Dropping a role is just as easy as creating one. The syntax you use is as follows: DROP ROLE <role name> In this case, you merely need to identify the name of the role, as in the following example:

DROP ROLE CUSTOMERS;

(Continues on next page)

The role is removed from the database. However, before removing a role, be sure that it is a role that you no longer need or that it is one you specifically want to delete (for security reasons). As you can see, creating and dropping roles is a very simple process, and it can make managing your users a lot easier. Roles essentially allow you to group together those users who require the same privileges on the same objects. Now let s take a look at granting and revoking privileges to authentication identifiers, including both user identifiers and role names.

Support for the CREATE ROLE and DROP ROLE statements varies from implementation to implementation. For example, Oracle and SQL Server (2005 and 2008) support both statements, but not the WITH ADMIN option. MySQL 5.0 does not appear to support the concept of roles.

on both cost and revenue at the same time not on just one or the other. What a breakthrough! This function is a building block of business management, and business owners must keep it in their subconscious all the time. As a new business survives or succeeds, it starts growing because of increased demand or the founder s ability to offer additional products or services. The founder can no longer run the business alone and hires the first employee. He or she probably rents some space and buys some tools of the trade. The control of the business now rests in the hands of the employee and the founder or the leader. Although the performance of each person is still clearly visible, the complexity of the business is increasing. The new costs that come with growth are added to the existing costs of the business. These additional costs may be ignored as the focus on the basic equation of profitability continues. However, the basic cost model, and its relationship with profitability, has changed as follows: Profitability f[cost(build/buy, building, tools, employee), revenue]

When you grant privileges on an object, you are associating one or more privileges with one or more authorization identifiers. This set of privileges and authorization identifiers is assigned

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