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where x represents the mean. Create a Visual Basic project to determine x , where the values of n and x1, x2, etc., are entered as input parameters. Use a single looping structure to enter the x-values and to determine x (remember that x is a cumulative sum, not a cumulative product).

6:

A role name is a defined set of privileges that can be assigned to a user or to another role. If a role name is granted access to a schema object, then all user identifiers and role names that have been assigned the specified role name are granted the same access to that object whenever the role name is the current authorization identifier. For example, in Figure 6-1 the MRKT_DEPT role name has been assigned to the ACCT_DEPT role name and to four user identifiers: Ethan, Max, Linda, and Emma. If the MRKT_DEPT role name is the current authorization identifier and it has been granted access to the PERFORMERS table, the ACCT_DEPT role name and all four user identifiers have access to the PERFORMERS table. Note that, unlike a user identifier, SQL does specify how to create a role name, which I discuss in the Create and Delete Roles section later in this chapter. Role names are commonly used as a mechanism for granting a uniform set of privileges to authorization identifiers that should have the same privileges, such as people who work in the same department. They also have the distinct advantage of existence independent of user identifiers, which means they can be created prior to the user identifiers, and they persist even after the user identifiers referencing them are deleted. This is very helpful when administering privileges for a fluid workforce. In addition to user identifiers and role names, SQL supports a special built-in authorization identifier named PUBLIC, which includes everyone who uses the database. Just as with any other authorization identifier, you can grant access privileges to the PUBLIC account. For example, suppose you wanted all potential customers to be able to view your list of CDs.

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FIGURE 5-5.

PERFORMERS PERFORMER_ID: FULL_NAME: VARCHAR(60) INT 10001 10002 10005 10006 10008 10009 Jennifer Warnes Joni Mitchell Bing Crosby Patsy Cline Placido Domingo Luciano Pavarotti Authorization identifier (MRKT_DEPT role name) User identifier (Emma) Role name (ACCT_DEPT)

User identifier (Linda) User identifier (Ethan) User identifier (Max)

Figure 6-1

The menu items have been modified to add access characters, as shown below (note the added ampersands).

You could grant the necessary privileges to the PUBLIC account for the appropriate tables and columns. Obviously, PUBLIC should be used with great care because it can open the door for people with ill intentions. In fact, many organizations ban its use completely.

Each SQL session is associated with a user identifier and role name. An SQL session is the connection between some sort of client application and the database. The session provides the context in which the authorization identifier executes SQL statements during a single connection. Throughout this connection, the SQL session maintains its association with a user identifier/role name pair. Let s take a look at Figure 6-2, which shows the user identifier/role name pair associated with a session. When a session is first established, the user identifier is always the SQL session user identifier, which is a special type of user identifier that remains associated with the session throughout the connection. It is up to the SQL implementation to determine how a specific account becomes the SQL session user identifier, although it can be an operating system user account or an account specific to the RDBMS. Whatever method is used to associate an account with the SQL session user identifier, it is this account that acts as the current user identifier. As you can also see in Figure 6-2, the role name is a null value. The role name is always null when a session is first established. In other words, whenever you log onto an SQL database and establish a session, the initial user identifier will always be the SQL session user identifier and the role name will always be a null value.

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