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8. What are the required elements of a DECLARE CURSOR statement DECLARE <cursor name> CURSOR FOR <query expression> 9. What cursor type does not see changes made by statements outside the cursor Insensitive cursors 10. Which option should you use in a cursor declaration to extend the retrieving capabilities of a FETCH statement A. WITHOUT HOLD B. ASENSITIVE C. SCROLL D. FOR UPDATE C is the correct answer. 11. Cursor ____________ refers to a characteristic in cursors that is concerned with whether a cursor is automatically closed when the transaction in which the cursor was opened is committed. Holdability 12. You re creating a cursor declaration. The SELECT statement includes an ORDER BY clause. Which clauses cannot be included in the SELECT statement A. SELECT B. HAVING C. GROUP BY D. WHERE B and C are the correct answers. 13. What option should you include in a cursor declaration to define that cursor as holdable WITH HOLD 14. Your cursor declaration includes a FOR UPDATE clause that does not specify any columns. Which columns in the underlying table can be updated All columns 15. What SQL statement should you use if you want to open the CD_ARTISTS cursor You should use the following statement: OPEN CD_ARTISTS; 16. Which SQL statement executes the SELECT statement in a cursor OPEN statement
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17. A(n) ____________ statement retrieves rows from a cursor s query results once you open that cursor. FETCH 18. What type of cursor allows you to use all the fetch orientation options in a FETCH statement Scrollable cursor 19. Which fetch orientation option should you use in a FETCH statement if you want to be sure to retrieve the first row in a cursor s query results A. PRIOR B. NEXT C. ABSOLUTE -1 D. FIRST D is the correct answer. 20. What clause is required in a positioned UPDATE statement in order to update a row returned by the most recent FETCH statement WHERE CURRENT OF <cursor name>
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16: Managing SQL Transactions
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1. Which transaction characteristic refers to the all-or-nothing nature of a transaction A. Atomic B. Consistent C. Isolated D. Durable A is the correct answer. 2. A(n) ____________ is a unit of work that is made up of one or more SQL statements that perform a related set of actions. Transaction 3. What statement can you use to explicitly initiate a transaction START TRANSACTION 4. Which SQL statements will terminate a transaction A. SAVEPOINT B. SET TRANSACTION C. ROLLBACK D. COMMIT C and D are the correct answers.
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SQL: A Beginner s Guide
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5. What are the three types of transaction modes that you can specify in a SET TRANSACTION statement Access level, isolation level, and diagnostics size 6. Which access level options can you include in a START TRANSACTION statement A. READ ONLY B. UPDATE C. LOCAL D. READ WRITE A and D are the correct answers. 7. Two concurrent transactions are active in your system. The first transaction modifies data in a table. The second transaction sees those modifications before they re actually committed to the database. The first transaction then rolls back the modifications. Which type of data phenomenon has occurred A. Phantom read B. Repeatable read C. Dirty read D. Nonrepeatable read C is the correct answer. 8. A(n) ____________ read can occur when a transaction reads a table based on some sort of search condition, then a second transaction updates the data in the table, and then the first transaction attempts to reread the data, but this time different rows are returned because of how the search condition is defined. Phantom 9. What type of constraint can you specify in a SET CONSTRAINTS statement Deferrable constraint 10. Which isolation level fully isolates one transaction from another transaction SERIALIZABLE 11. You re using a SET TRANSACTION statement to configure transaction modes. You want to ensure that no nonrepeatable reads and no dirty reads can occur within that transaction. However, you re not concerned about phantom reads. Which isolation level should you use A. READ UNCOMMITTED B. READ COMMITTED
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