tailieunhanh - OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P59

OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P59:There is an ever increasing demand for staff with IT industry certification. The benefits to employers are significant—they can be certain that staff have a certain level of competence—and the benefits to the individuals, in terms of demand for their services, are equally great. Many employers are now requiring technical staff to have certifications, and many IT purchasers will not buy from firms that do not have certified staff. | OCA OCP Oracle Database 11g All-in-One Exam Guide 536 B. It will be executed after the outer query. C. It will be executed concurrently with the outer query. D. It will be executed once for every row in the EMPLOYEES table. 5. Consider the following statement select last_name from employees join departments on where department_name Executive and this statement select last_name from employees where department_id in select department_id from departments where department_name Executive What can be said about the two statements Choose two correct answers. A. The two statements should generate the same result. B. The two statements could generate different results. C. The first statement will always run successfully the second statement will fail if there are two departments with DEPARTMENT_NAME Executive . D. Both statements will always run successfully even if there are two departments with DEPARTMENT_NAME Executive . 6. What are the distinguishing characteristics of a scalar subquery Choose two correct answers. A. A scalar subquery returns one row. B. A scalar subquery returns one column. C. A scalar subquery cannot be used in the SELECT list of the parent query. D. A scalar subquery cannot be used as a correlated subquery. 7. Which comparison operator cannot be used with multiple-row subqueries Choose the best answer. A. ALL B. ANY C. IN D. NOT IN E. All of the above can be used 8. Consider this statement select last_name select count from departments from employees where salary select salary from employees What is wrong with it Choose the best answer. A. Nothing is wrong the statement should run without error. B. The statement will fail because the subquery in the SELECT list references a table that is not listed in the FROM clause. Chapter 13 Subqueries and Set Operators 537 C. The statement will fail if the conditional subquery returns more than one row. D. The statement will run but is extremely inefficient .

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