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OCA/OCP Oracle Database 11g All-in-One Exam Guide
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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:
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select last_name from employees join departments on employeesdepartment_id = departmentsdepartment_id where department_name='Executive';
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and this statement:
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select last_name from employees where department_id in (select department_id from departments where department_name='Executive');
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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:
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select last_name, (select count(*) from departments) from employees where salary = (select salary from employees);
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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
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13: Subqueries and Set Operators
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C The statement will fail if the conditional subquery returns more than one row D The statement will run but is extremely inefficient because of the need to run the second subquery once for every row in EMPLOYEES 9 Which of the following statements are equivalent (Choose two answers) A select employee_id from employees where salary < all (select salary from employees where department_id=10); PART II B select employee_id from employees where salary < (select min(salary) from employees where department_ id=10); C select employee_id from employees where salary not >= any (select salary from employees where department_id=10); D select employee_id from employees e join departments d on edepartment_id=ddepartment_id where esalary < (select min(salary) from employees) and ddepartment_ id=10; 10 Consider this statement, which is intended to prompt for an employee s name and then find all employees who have the same job as the first employee:
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select last_name,employee_id from employees where job_id = (select job_id from employees where last_name = '&Name');
What would happen if a value were given for &Name that did not match with any row in EMPLOYEES (Choose the best answer) A The statement would fail with an error B The statement would return every row in the table C The statement would return no rows D The statement would return all rows where JOB_ID is NULL 11 Which of these set operators will not sort the rows (Choose the best answer) A INTERSECT B MINUS C UNION D UNION ALL 12 Which of these operators will remove duplicate rows from the final result (Choose all that apply) A INTERSECT B MINUS C UNION D UNION ALL
OCA/OCP Oracle Database 11g All-in-One Exam Guide
13 If a compound query contains both a MINUS and an INTERSECT operator, which will be applied first (Choose the best answer) A The INTERSECT, because INTERSECT has a higher precedence than MINUS B The MINUS, because MINUS has a higher precedence than INTERSECT C The precedence is determined by the order in which they are specified D It is not possible for a compound query to include both MINUS and INTERSECT 14 There are four rows in the REGIONS table Consider the following statements and choose how many rows will be returned for each: 0, 4, 8, or 16 A select * from regions union select * from regions B select * from regions union all select * from regions C select * from regions minus select * from regions D select * from regions intersect select * from regions 15 Consider this compound query:
select empno, hired from emp union all select emp_id,hired,fired from ex_emp;
The columns EMPEMPNO and EX_EMPEMP_ID are integer; the column EMPHIRED is timestamp; the columns EX_EMPHIRED and EX_EMPFIRED are date Why will the statement fail (Choose the best answer) A Because the columns EMPNO and EMP_ID have different names B Because the columns EMPHIRED and EX_EMPHIRED are different data types C Because there are two columns in the first query and three columns in the second query D For all of the reasons above E The query will succeed 16 Which line of this statement will cause it to fail (Choose the best answer) A select ename, hired from current_staff B order by ename C minus D select ename, hired from current staff E where deptno=10 F order by ename; 17 Study this statement:
select ename from emp union all select ename from ex_emp;
In what order will the rows be returned (Choose the best answer) A The rows from each table will be grouped and within each group will be sorted on ENAME
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