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Use a loop structure to calculate the sum Display the sum in a separate text box, with an appropriate label 448 Modify the Visual Basic project created in Prob 447 to compute the sum of the integers ranging from n1 to n2, where n1 < n2 Include provisions for carrying out the computation in any of the following ways: (a) (b) (c) Sum all of the integers ranging from n1 to n2 Sum only the even integers within the interval defined by n1 and n2 Sum only the odd integers within the interval defined by n1 and n2..

10. What is a query specification 11. Which guidelines should you follow if you want to create an updateable view A Data within the view cannot be summarized, grouped together, or automatically

B At least one column in the source table must be updateable. C Each column in the view must be traceable to exactly one source column in one table. D Each row in the view must be traceable to exactly one source row in one table. 12. You create the following view based on the COMPACT_DISCS table in the INVENTORY

database:

Expected Benefits:

CREATE VIEW IN_STOCK_AVERAGE AS SELECT AVG(IN_STOCK) FROM COMPACT_DISCS;

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Enter the values of n1 and n2 in separate text boxes. Generate an error message if the condition n1 < n2 is not satisfied. Use option buttons to accommodate the three different choices. In each case, use an appropriate loop to calculate the sum. Display the sum in its own text box. Label all input and output. 4.49 The mean (or arithmetic average) of a list of n numbers is defined as x = ( x1 + x 2 + + xn ) / n

13. What type of view does the WITH CHECK OPTION clause apply to 14. You create the following view definition: CREATE VIEW EMP_COMM AS SELECT EMPLOYEE_ID, YEAR_1999, YEAR_2000 FROM EMPLOYEE_COMMISSIONS WHERE YEAR_1999 > 100;

You want to use the view to update data. What happens if you change the YEAR_1999 value to an amount less than or equal to 100

Understand the SQL Security Model Create and Delete Roles Grant and Revoke Privileges Grant and Revoke Roles

Impact on Profitability:

critical component of any database is the ability to protect the data from unauthorized access and malicious attacks. A database must ensure that no unauthorized users can view or change data that they should not be viewing or changing. At the same time, authorized users should not be prevented from accessing any information that should be available to them. The ideal balance is to give every database user exactly the privileges they need to do their job, nothing more and nothing less. In order to support these capabilities, SQL defines a security model that allows you to determine which users can access specific data and what they can do with that data. At the core of this model is the authorization identifier. An authorization identifier, as you learned in 2, is an object in the SQL environment that represents a user or group of users that are granted specific access privileges to objects and data within the SQL environment. Privileges on schema objects are granted to authorization identifiers. The type of privilege granted determines the type of access. In this chapter, we will look at the SQL security model, how it uses authorization identifiers, and how to set up privileges on objects in your SQL database.

Authorization identifiers provide the foundation for your database s security. Access to all objects is permitted through these identifiers. If the authorization identifier doesn t have the appropriate privileges to access a specific object, such as a table, the data within that table is unavailable to that user. In addition, each authorization identifier can be configured with different types of privileges. For example, you can permit some authorization identifiers to view the data within a specific table, while permitting other authorization identifiers to both view and modify that data. SQL supports two types of authorization identifiers: user identifiers (or users) and role names (or roles). A user identifier is an individual security account that can represent an individual, an application, or a system service (all of which are considered database users). The SQL standard does not specify how an SQL implementation should create a user identifier. The identifier might be tied to the operating system on which the relational database management system (RDBMS) is running, or it might be explicitly created within the RDBMS environment.

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