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SQL: A Beginner s Guide
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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 The row is changed but you will no longer be able to use the view to display the row or update it. To avoid having this occur, you can use the WITH CHECK OPTION clause in the CREATE VIEW statement. 15. You want to alter the EMP_COMM view definition in your database. How do you alter that definition You must drop the view and then recreate the view. 16. You want to drop the EMP_BIRTHDAYS view definition from your database. What SQL statement should you use You should use the following SQL statement: DROP VIEW EMP_BIRTHDAYS; 17. What happens to the SQL data when you drop a view from the database None of the underlying data (which is stored in the base tables) is affected when you drop a view. Only the view definition is removed.
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6: Managing Database Security
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1. What is the difference between a user identifier and a role name A user identifier is an individual security account that can represent an individual, an application, or a system service. A role name is a defined set of privileges that can be assigned to a user or to another role. 2. What is the name of the special authorization identifier that grants access to all database users PUBLIC 3. Each ____________ is associated with a user identifier and role name. SQL session 4. An SQL session is associated with which of the following A. Privilege B. User identifier C. PUBLIC D. Role name B and D are the correct answers.
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Appendix A:
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5. When an SQL session is first established, the user identifier is always the ____________. SQL session user identifier 6. What is the value of the current role name when an SQL session is first established A null value 7. What is an authorization identifier An authorization identifier 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. 8. What two types of authorization identifiers does SQL support User identifiers and role names 9. Which privilege should you grant on an object if you want to allow an authorization identifier to query data in that object SELECT 10. You establish an SQL session with your database. The current user identifier is EthanW. The current role name is null. What is the current authorization identifier EthanW 11. On which schema objects can you define access privileges Base tables, views, columns, domains, character sets, collations, translations, user-defined types, triggers, and SQL-invoked routines 12. On which types of database objects can you assign the DELETE privilege A. Tables B. Views C. Columns D. Domains A and B are the correct answers. 13. On which types of database objects can you assign the TRIGGER privilege A. Tables B. Views C. Columns D. Domains A is the correct answer.
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SQL: A Beginner s Guide
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14. You re creating a role named ACCOUNTING. Which SQL statement should you use You should use the following SQL statement: CREATE ROLE ACCOUNTING; 15. You re granting all privileges on the CD_NAMES view to everyone who uses the database. Which SQL statement should you use You should use the following SQL statement: GRANT ALL PRIVILEGES ON TABLE CD_NAMES TO PUBLIC; 16. You re granting the SELECT privilege to the SALES_CLERK role on a table in your database. You want the SALES_CLERK role to be able to assign the SELECT privilege to other users. What clause should you include in your GRANT statement WITH GRANT OPTION 17. You want to grant the ACCT role to the MaxN user authorization. You do not want the user to be able to grant the role to other users. What SQL statement should you use to grant the role You should use the following SQL statement: GRANT ACCT TO MaxN;
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