(Answer
all questions in this section)
1.
A multiple-row operator expects how many
values? Mark for Review
(1)
Points
One or more (*)
Only one
Two or more
None
2.
The salary column of the f_staffs table
contains the following values:
4000
5050
6000
11000
23000
Which of
the following statements will return the last_name and first_name of those
employees who earn more than 5000?
Mark
for Review
(1)
Points
SELECT last_name, first_name
FROM
f_staffs
WHERE
salary IN
(SELECT
last_name, first_name FROM f_staffs WHERE salary <5000 o:p="">
SELECT last_name, first_name
FROM
f_staffs
WHERE
salary = (SELECT salary FROM f_staffs WHERE salary < 5000);
SELECT last_name, first_name
FROM
f_staffs
WHERE
salary IN (SELECT salary FROM f_staffs WHERE salary > 5000);
(*)
SELECT last_name, first_name
FROM
f_staffs
WHERE
salary = (SELECT salary FROM f_staffs WHERE salary > 5000);
3.
Examine the data in the PAYMENT table:
PAYMENT_ID
CUSTOMER_ID
PAYMENT_DATE
PAYMENT_TYPE
PAYMENT_AMOUNT
86590586
8908090
10-Jun-2003 BASIC 859.00
89453485
8549038
15-Feb-2003 INTEREST
596.00
85490345
5489304
20-Mar-2003 BASIC 568.00
This
statement fails when executed:
SELECT
customer_id, payment_type
FROM
payment
WHERE
payment_id =
(SELECT payment_id
FROM payment
WHERE payment_amount = 596.00 OR payment_date = '20-Mar-2003');
Which
change could correct the problem?
Mark
for Review
(1)
Points
Change the outer query WHERE clause to 'WHERE payment_id IN'. (*)
Remove the parentheses surrounding the nested SELECT statement.
Change the comparison operator to a single-row operator.
Remove the quotes surrounding the date value in the OR clause.
4.
Which of the following statements contains
a comparison operator that is used to restrict rows based on a list of values returned
from an inner query? Mark for Review
(1)
Points
SELECT description
FROM
d_types
WHERE
code
IN
(SELECT type_code FROM d_songs);
SELECT description
FROM
d_types
WHERE
code = ANY (SELECT type_code FROM d_songs);
SELECT description
FROM
d_types
WHERE
code <> ALL (SELECT type_code FROM d_songs);
All of the above. (*)
5.
Group functions can be used in
multiple-row subqueries in the HAVING and GROUP BY clauses. True or
False? Mark for Review
(1)
Points
True (*)
False
6.
The SQL multiple-row subquery
extends the capability of the single-row syntax through the use of which three
comparison operators? Mark for Review
(1)
Points
IN, ANY, and EVERY
IN, ALL, and EVERY
IN, ANY, and EQUAL
IN, ANY, and ALL (*)
7.
Which statement about the <>
operator is true?
Mark for Review
(1)
Points
The <> operator can be used when a single-row subquery returns only one
row. (*)
The <> operator is NOT a valid SQL operator.
The <> operator CANNOT be used in a single-row subquery.
The <> operator returns the same result as the ANY operator in a
subquery.
8.
Single row subqueries may not
include this operator: Mark for Review
(1)
Points
>
<>
ALL (*)
=
9.
Examine the structure of the
EMPLOYEE, DEPARTMENT, and ORDERS tables.
EMPLOYEE:
EMPLOYEE_ID
NUMBER(9)
LAST_NAME
VARCHAR2(25)
FIRST_NAME
VARCHAR2(25)
DEPARTMENT_ID
NUMBER(9)
DEPARTMENT:
DEPARTMENT_ID
NUMBER(9)
DEPARTMENT_NAME
VARCHAR2(25)
CREATION_DATE
DATE
ORDERS:
ORDER_ID
NUMBER(9)
EMPLOYEE_ID
NUMBER(9)
DATE
DATE
CUSTOMER_ID
NUMBER(9)
You want
to display all employees who had an order after the Sales department was
established. Which of the following constructs would you use?
Mark
for Review
(1)
Points
The HAVING clause
A group function
A single-row subquery (*)
A MERGE statement
10.
If you use the equality operator (=) with a subquery,
how many values can the subquery return? Mark for
Review
(1)
Points
Only 1 (*)
Up to 2
Up to 5
Unlimited
11.
The TEACHERS and CLASS_ASSIGNMENTS tables contain
these columns:
TEACHERS
TEACHER_ID
NUMBER(5) Primary Key
NAME
VARCHAR2 (25)
SUBJECT_ID
NUMBER(5)
CLASS_ID
NUMBER(5)
CLASS_ASSIGNMENTS
CLASS_ID
NUMBER (5) Primary Key
TEACHER_ID
NUMBER (5)
DATE
MAX_CAPACITY
NUMBER (3)
All
MAX_CAPACITY values are greater than 10. Which two SQL statements correctly use
subqueries? (Choose two.)
Mark
for Review
(1)
Points
(Choose all correct answers)
SELECT *
FROM
teachers
WHERE
teacher_id LIKE (SELECT teacher_id FROM class_assignments WHERE max_capacity
> 1000);
SELECT *
FROM
teachers
WHERE
teacher_id = (SELECT teacher_id FROM class_assignments WHERE class_id = 45963);
(*)
SELECT *
FROM
class_assignments
max_capacity
= (SELECT AVG(max_capacity) FROM class_assignments GROUP BY teacher_id);
SELECT *
FROM
teachers
WHERE
teacher_id = (SELECT teacher_id, class_assignments WHERE max_capacity > 0);
SELECT *
FROM
class_assignments
WHERE
max_capacity = (SELECT AVG(max_capacity) FROM class_assignments);
(*)
12.
Which operator can be used with a multiple-row
subquery? Mark for Review
(1)
Points
LIKE
IN (*)
=
<>
13.
Which answer is INCORRECT? The parent statement of a
correlated subquery can be:
Mark for Review
(1)
Points
A SELECT statement
A DELETE statement
An UPDATE statement
An INSERT statement (*)
14.
Oracle allows you to write named subqueries in one
single statement, as long as you start your statement with the keyword WITH.
True or False? Mark for
Review
(1)
Points
True (*)
False
15.
The Oracle server performs a correlated subquery when
the subquery references a column from a table referred to in the parent. True
or False? Mark for
Review
(1)
Points
True (*)
False
1.
In a non-correlated subquery, the
outer query always executes prior to the inner query's execution. True or
False? Mark for Review
(1)
Points
True
False (*)
2.
Subqueries are limited to four per
SQL transaction. True or False? Mark for Review
(1)
Points
True
False (*)
3.
Which statement about the <>
operator is true?
Mark for Review
(1)
Points
The <> operator can be used when a single-row subquery returns only one
row. (*)
The <> operator is NOT a valid SQL operator.
The <> operator CANNOT be used in a single-row subquery.
The <> operator returns the same result as the ANY operator in a
subquery.
4.
Which statement about subqueries is
true? Mark for Review
(1)
Points
Subqueries should be enclosed in double quotation marks.
Subqueries generally execute last, after the main or outer query executes.
Subqueries cannot contain group functions.
Subqueries are often used in a WHERE clause to return values for an unknown
conditional value. (*)
5.
You need to create a report to
display the names of products with a cost value greater than the average cost
of all products. Which SELECT statement should you
use? Mark for Review
(1)
Points
SELECT product_name
FROM
products
WHERE
cost > AVG(cost);
SELECT product_name
FROM
products
WHERE
cost > (SELECT AVG(cost)
FROM
products);
(*)
SELECT AVG(cost), product_name
FROM
products
WHERE
cost > AVG(cost)
GROUP by
product_name;
SELECT product_name
FROM
(SELECT AVG(cost) FROM product)
WHERE
cost > AVG(cost);
6.
The TEACHERS and CLASS_ASSIGNMENTS
tables contain these columns:
TEACHERS
TEACHER_ID
NUMBER(5) Primary Key
NAME
VARCHAR2 (25)
SUBJECT_ID
NUMBER(5)
CLASS_ID
NUMBER(5)
CLASS_ASSIGNMENTS
CLASS_ID
NUMBER (5) Primary Key
TEACHER_ID
NUMBER (5)
DATE
MAX_CAPACITY
NUMBER (3)
All
MAX_CAPACITY values are greater than 10. Which two SQL statements correctly use
subqueries? (Choose two.)
Mark
for Review
(1)
Points
(Choose all correct answers)
SELECT *
FROM
class_assignments
max_capacity
= (SELECT AVG(max_capacity) FROM class_assignments GROUP BY teacher_id);
SELECT *
FROM
teachers
WHERE
teacher_id = (SELECT teacher_id FROM class_assignments WHERE class_id = 45963);
(*)
SELECT *
FROM
teachers
WHERE
teacher_id LIKE (SELECT teacher_id FROM class_assignments WHERE max_capacity
> 1000);
SELECT *
FROM
class_assignments
WHERE
max_capacity = (SELECT AVG(max_capacity) FROM class_assignments);
(*)
SELECT *
FROM
teachers
WHERE
teacher_id = (SELECT teacher_id, class_assignments WHERE max_capacity > 0);
7.
When creating a report of all
employees earning more than the average salary for their department, a
__________ ____________ can be used to first calculate the average salary of
each department, and then compare the salary for each employee to the average
salary of that employeeﾒs
department. Mark for Review
(1)
Points
WITH CLAUSE
GROUP BY
CORRELATED SUBQUERY (*)
8.
Which statement is
false? Mark for Review
(1)
Points
The WITH clause retrieves the results of one or more query blocks.
The WITH clause stores the results for the user who runs the query.
The WITH clause decreases performance. (*)
The WITH clause makes the query simple to read.
9.
Correlated Subqueries must reference
the same tables in both the inner and outer queries. (True or
False?) Mark
for Review
(1)
Points
True
False (*)
10.
When a multiple-row subquery uses the NOT IN operator
(equivalent to <>ALL), if one of the values returned by the inner query
is a null value, the entire query returns: Mark for Review
(1)
Points
All rows that were selected by the inner query including the null values
No rows returned (*)
All rows that were selected by the inner query minus the null values
A list of Nulls
11.
Examine the structures of the PARTS and MANUFACTURERS
tables:
PARTS:
PARTS_ID
VARCHAR2(25) PK
PARTS_NAME
VARCHAR2(50)
MANUFACTURERS_ID
NUMBER
COST
NUMBER(5,2)
PRICE
NUMBER(5,2)
MANUFACTURERS:
ID
NUMBER PK
NAME
VARCHAR2(30)
LOCATION
VARCHAR2(20)
Assume
that the tables have been populated with data including 100 rows in the PARTS
table, and 20 rows in the MANUFACTURERS table. Which SQL statement correctly
uses a subquery?
Mark
for Review
(1)
Points
SELECT parts_name, price, cost
FROM
parts
WHERE
manufacturers_id !=
(SELECT id
FROM manufacturers
WHERE LOWER(name) = 'cost plus');
SELECT parts_name, price, cost
FROM
parts
WHERE
manufacturers_id IN
(SELECT id
FROM manufacturers m
JOIN parts p
ON (m.id = p.manufacturers_id));
(*)
UPDATE parts SET price = price * 1.15
WHERE
manufacturers_id =
(SELECT id
FROM manufacturers
WHERE UPPER(location) IN("ATLANTA", "BOSTON",
"DALLAS"));
SELECT parts_name
FROM
(SELECT AVG(cost) FROM manufacturers)
WHERE
cost > AVG(cost);
12.
You need to create a SELECT statement that contains a
multiple-row subquery. Which comparison operator(s) can you
use? Mark for Review
(1)
Points
=, <, and >
IN, ANY, and ALL (*)
LIKE
BETWEENﾅANDﾅ
13.
You are looking for Executive information using a
subquery.
What
will the following SQL statement display?
SELECT
department_id, last_name, job_id
FROM
employees
WHERE
department_id IN
(SELECT department_id FROM departments WHERE department_name = 'Executive');
Mark
for Review
(1)
Points
The department ID, department name, and last name for every employee in the
Executive department
The department ID, last name, and department name for every Executive in the
employees table
The department ID, last name, and job ID from departments for Executive
employees
The department ID, last name, and job ID for every employee in the Executive
department (*)
14.
Evaluate the structure of the EMPLOYEES and
DEPART_HIST tables:
EMPLOYEES
EMPLOYEE_ID
NUMBER(9)
LAST_NAME
VARCHAR2(25)
FIRST_NAME
VARCHAR2(25)
DEPARTMENT_ID
NUMBER(9)
MANAGER_ID
NUMBER(9)
SALARY
NUMBER(7,2)
DEPART_HIST:
EMPLOYEE_ID
NUMBER(9)
OLD_DEPT_ID
NUMBER(9)
NEW_DEPT_ID
NUMBER(9)
CHANGE_DATE
DATE
You want
to generate a list of employees who are in department 10, but used to be in
department 15. Which query should you use?
Mark
for Review
(1)
Points
SELECT employee_id, last_name, first_name, department_id
FROM
employees
WHERE
(employee_id, department_id) =
(SELECT employee_id, new_dept_id
FROM depart_hist
WHERE new_dept_id = 15);
SELECT employee_id, last_name, first_name, department_id
FROM
employees
WHERE
(employee_id, department_id) IN
(SELECT employee_id, dept_id
FROM employees
WHERE old_dept_id = 15);
SELECT employee_id, last_name, first_name, department_id
FROM
employees
WHERE
(employee_id) IN
(SELECT employee_id
FROM employee_hist
WHERE old_dept_id = 15);
SELECT employee_id, last_name, first_name, department_id
FROM
employees
WHERE
(employee_id, department_id) IN
(SELECT employee_id, new_dept_id
FROM depart_hist
WHERE old_dept_id = 15) AND new_dept_id = 10;
(*)
15.
Which of the following best describes the meaning of
the ANY operator? Mark for Review
(1)
Points
Equal to any member in the list
Equal to each value in the list
Compare value to the first value returned by the subquery
Compare value to each value returned by the subquery (*)
1.
Table aliases must be used when you
are writing correlated subqueries. (True or
false?) Mark for Review
(1)
Points
True
False (*)
2.
Oracle allows you to write named
subqueries in one single statement, as long as you start your statement with the
keyword WITH. True or
False? Mark for Review
(1)
Points
True (*)
False
3.
Which statement is
false? Mark for Review
(1)
Points
The WITH clause decreases performance. (*)
The WITH clause makes the query simple to read.
The WITH clause stores the results for the user who runs the query.
The WITH clause retrieves the results of one or more query blocks.
4.
Subqueries can only be placed in the
WHERE clause. True or False? Mark for Review
(1)
Points
True
False (*)
5.
Which operator can be used with a
multiple-row subquery? Mark for Review
(1)
Points
IN (*)
LIKE
<>
=
6.
Using a subquery in which clause
will return a syntax error? Mark for Review
(1)
Points
WHERE
FROM
HAVING
You can use subqueries in all of the above clauses. (*)
7.
Which comparison operator can only
be used with a single-row subquery? Mark for Review
(1)
Points
IN
<> (*)
ANY
ALL
8.
Subqueries are limited to four per
SQL transaction. True or False? Mark for Review
(1)
Points
True
False (*)
9.
You need to produce a report that
contains all employee-related information for those employees who have Brad
Carter as a supervisor. However, you are not sure which supervisor ID belongs
to Brad Carter. Which query should you issue to accomplish this
task? Mark for Review
(1)
Points
SELECT *
FROM
employees
WHERE
supervisor_id = (SELECT supervisor_id
FROM employees
WHERE last_name = 'Carter');
SELECT *
FROM
supervisors
WHERE
supervisor_id =
(SELECT supervisor_id
FROM employees
WHERE last_name = 'Carter');
SELECT *
FROM
employees
WHERE
supervisor_id =
(SELECT employee_id
FROM employees
WHERE last_name = 'Carter');
(*)
SELECT *
FROM
supervisors
WHERE
supervisor_id =
(SELECT employee_id
FROM supervisors
WHERE last_name = 'Carter');
10.
Which operator or keyword cannot be used with a
multiple-row subquery? Mark for Review
(1)
Points
>
= (*)
ANY
ALL
11.
When a multiple-row subquery uses the NOT IN operator
(equivalent to <>ALL), if one of the values returned by the inner query
is a null value, the entire query returns: Mark for Review
(1) Points
A list of Nulls
No rows returned (*)
All rows that were selected by the inner query including the null values
All rows that were selected by the inner query minus the null values
12.
Evaluate this SQL statement:
SELECT
employee_id, last_name, salary
FROM
employees
WHERE
department_id IN
(SELECT department_id
FROM employees
WHERE salary > 30000 AND salary < 50000);
Which
values will be displayed?
Mark
for Review
(1)
Points
Only employees who earn more than $30,000.
All employees who work in a department with employees who earn more than
$30,000 and more than $50,000.
All employees who work in a department with employees who earn more than
$30,000, but less than $50,000. (*)
Only employees who earn less than $50,000.
13.
Group functions can be used in multiple-row subqueries
in the HAVING and GROUP BY clauses. True or
False? Mark for Review
(1)
Points
True (*)
False
14.
The SQL multiple-row subquery extends the capability
of the single-row syntax through the use of which three comparison
operators? Mark for Review
(1)
Points
IN, ANY, and ALL (*)
IN, ANY, and EVERY
IN, ALL, and EVERY
IN, ANY, and EQUAL
15.
Evaluate the structure of the EMPLOYEES and
DEPART_HIST tables:
EMPLOYEES
EMPLOYEE_ID
NUMBER(9)
LAST_NAME
VARCHAR2(25)
FIRST_NAME
VARCHAR2(25)
DEPARTMENT_ID
NUMBER(9)
MANAGER_ID
NUMBER(9)
SALARY
NUMBER(7,2)
DEPART_HIST:
EMPLOYEE_ID
NUMBER(9)
OLD_DEPT_ID
NUMBER(9)
NEW_DEPT_ID
NUMBER(9)
CHANGE_DATE
DATE
You want
to generate a list of employees who are in department 10, but used to be in
department 15. Which query should you use?
Mark
for Review
(1)
Points
SELECT employee_id, last_name, first_name, department_id
FROM
employees
WHERE
(employee_id, department_id) =
(SELECT employee_id, new_dept_id
FROM depart_hist
WHERE new_dept_id = 15);
SELECT employee_id, last_name, first_name, department_id
FROM
employees
WHERE
(employee_id, department_id) IN
(SELECT employee_id, dept_id
FROM employees
WHERE old_dept_id = 15);
SELECT employee_id, last_name, first_name, department_id
FROM
employees
WHERE
(employee_id, department_id) IN
(SELECT employee_id, new_dept_id
FROM depart_hist
WHERE old_dept_id = 15) AND new_dept_id = 10;
(*)
SELECT employee_id, last_name, first_name, department_id
FROM
employees
WHERE (employee_id)
IN
(SELECT employee_id
FROM employee_hist
WHERE old_dept_id = 15);
1.
The Oracle server performs a
correlated subquery when the subquery references a column from a table referred
to in the parent. True or
False? Mark for
Review
(1)
Points
True (*)
False
2.
The WITH clause is a way of creating
extra tables in the database. (True or False?) Mark for Review
(1)
Points
True
False (*)
3.
In a correlated subquery, the outer
and inner queries are joined on one or more columns. (True or
False?) Mark
for Review
(1)
Points
True (*)
False
4.
If a single-row subquery returns a
null value and uses the equality comparison operator, what will the outer query
return? Mark for Review
(1)
Points
All the rows in the table
No rows (*)
A null value
An error
5.
Examine the structure of the
EMPLOYEE, DEPARTMENT, and ORDERS tables.
EMPLOYEE:
EMPLOYEE_ID
NUMBER(9)
LAST_NAME
VARCHAR2(25)
FIRST_NAME
VARCHAR2(25)
DEPARTMENT_ID
NUMBER(9)
DEPARTMENT:
DEPARTMENT_ID
NUMBER(9)
DEPARTMENT_NAME
VARCHAR2(25)
CREATION_DATE
DATE
ORDERS:
ORDER_ID
NUMBER(9)
EMPLOYEE_ID
NUMBER(9)
DATE
DATE
CUSTOMER_ID
NUMBER(9)
You want
to display all employees who had an order after the Sales department was
established. Which of the following constructs would you use?
Mark
for Review
(1)
Points
A MERGE statement
A group function
The HAVING clause
A single-row subquery (*)
6.
Single row subqueries may not
include this operator: Mark for Review
(1)
Points
=
>
<>
ALL (*)
7.
The SQL multiple-row subquery
extends the capability of the single-row syntax through the use of which three
comparison operators? Mark for Review
(1)
Points
IN, ANY, and EQUAL
IN, ANY, and ALL (*)
IN, ALL, and EVERY
IN, ANY, and EVERY
8.
Which of the following best
describes the meaning of the ANY operator? Mark
for Review
(1)
Points
Equal to each value in the list
Equal to any member in the list
Compare value to the first value returned by the subquery
Compare value to each value returned by the subquery (*)
9.
Which comparison operator would you
use to compare a value to every value returned by a
subquery?
Mark for Review
(1)
Points
IN
ANY
SOME
ALL (*)
10.
A multiple-row operator expects how many
values? Mark for Review
(1)
Points
One or more (*)
Only one
Two or more
None
11.
Evaluate this SELECT statement:
SELECT
player_id, name
FROM
players
WHERE
team_id IN
(SELECT team_id
FROM teams
WHERE team_id > 300 AND salary_cap > 400000);
What
would happen if the inner query returned a NULL value?
Mark
for Review
(1) Points
A syntax error in the outer query would be returned.
No rows would be returned by the outer query. (*)
A syntax error in the inner query would be returned.
All the rows in the PLAYER table would be returned by the outer query.
12.
You need to create a SELECT statement that contains a
multiple-row subquery. Which comparison operator(s) can you
use? Mark for Review
(1)
Points
LIKE
BETWEENﾅANDﾅ
IN, ANY, and ALL (*)
=, <, and >
13.
You need to display all the players whose salaries are
greater than or equal to John Brown's salary. Which comparison operator should
you use? Mark for Review
(1)
Points
=
<=
>= (*)
>
14.
What will the following statement return:
SELECT
last_name, salary
FROM
employees
WHERE
salary < (SELECT salary
FROM employees
WHERE employee_id = 103);
Mark
for Review
(1)
Points
A list of last_names and salaries of employees who make more than employee 103
A list of last_names and salaries of employees who make less than employee 103
(*)
A list of first_names and salaries of employees making less than employee 103
Nothing. It is an invalid statement.
15.
Which of the following is TRUE regarding the order of
subquery execution? Mark for Review
(1)
Points
The subquery executes once after the main query.
The result of the main query is used with the subquery.
The subquery executes once before the main query. (*)
The outer query is executed first.
1.
Examine the structure of the
EMPLOYEE, DEPARTMENT, and ORDERS tables.
EMPLOYEE:
EMPLOYEE_ID
NUMBER(9)
LAST_NAME
VARCHAR2(25)
FIRST_NAME
VARCHAR2(25)
DEPARTMENT_ID
NUMBER(9)
DEPARTMENT:
DEPARTMENT_ID
NUMBER(9)
DEPARTMENT_NAME
VARCHAR2(25)
CREATION_DATE
DATE
ORDERS:
ORDER_ID
NUMBER(9)
EMPLOYEE_ID
NUMBER(9)
DATE
DATE
CUSTOMER_ID
NUMBER(9)
You want
to display all employees who had an order after the Sales department was
established. Which of the following constructs would you use?
Mark
for Review
(1)
Points
A group function
The HAVING clause
A single-row subquery (*)
A MERGE statement
2.
If a single-row subquery returns a
null value and uses the equality comparison operator, what will the outer query
return? Mark for Review
(1)
Points
No rows (*)
A null value
All the rows in the table
An error
3.
The result of this statement will
be:
SELECT
last_name, job_id, salary, department_id
FROM
employees
WHERE
job_id =
(SELECT job_id
FROM employees
WHERE employee_id = 141) AND
department_id =
(SELECT department_id
FROM departments
WHERE location_id =1500);
Mark
for Review
(1)
Points
Only the employees whose job id matches employee 141 and who work in location
1500 (*)
All employees from Location 1500 will be displayed
All employees with the department id of 141
An error since you canﾒt
get data from two tables in the same subquery
4.
Which answer is INCORRECT? The
parent statement of a correlated subquery can
be: Mark for Review
(1)
Points
A SELECT statement
An UPDATE statement
A DELETE statement
An INSERT statement (*)
5.
Table aliases must be used when you
are writing correlated subqueries. (True or
false?) Mark for Review
(1)
Points
True
False (*)
6.
The WITH clause enables a SELECT
statement to define the subquery block at the start of the query, process the
block just once, label the results, and then refer to the results multiple
times. True or False? Mark for Review
(1)
Points
True (*)
False
7.
Which of the following statements is
a true guideline for using subqueries? Mark for Review
(1)
Points
The outer and inner queries can reference more than one table. They can get
data from different tables. (*)
Do not enclose the subquery in parentheses.
Only one WHERE clause can be used for a SELECT statement, and if specified, it
must be the outer query.
Place the subquery on the left side of the comparison condition.
8.
You need to create a report to
display the names of products with a cost value greater than the average cost
of all products. Which SELECT statement should you
use? Mark for Review
(1)
Points
SELECT product_name
FROM
(SELECT AVG(cost) FROM product)
WHERE
cost > AVG(cost);
SELECT AVG(cost), product_name
FROM
products
WHERE
cost > AVG(cost)
GROUP by
product_name;
SELECT product_name
FROM
products
WHERE
cost > (SELECT AVG(cost)
FROM
products);
(*)
SELECT product_name
FROM
products
WHERE
cost > AVG(cost);
9.
You need to display all the players
whose salaries are greater than or equal to John Brown's salary. Which
comparison operator should you use? Mark for Review
(1)
Points
>= (*)
=
<=
>
10.
Evaluate this SELECT statement:
SELECT
customer_id, name
FROM
customer
WHERE
customer_id IN
(SELECT customer_id
FROM customer
WHERE state_id = 'GA' AND credit_limit > 500.00);
What
would happen if the inner query returned null?
Mark
for Review
(1)
Points
Only the rows with CUSTOMER_ID values equal to null would be selected.
No rows would be returned by the outer query. (*)
An error would be returned.
All the rows in the table would be selected.
11.
Which statement about the ANY operator, when used with
a multiple-row subquery, is true? Mark for Review
(1)
Points
The ANY operator is a synonym for the ALL operator.
The ANY operator can be used with the LIKE and IN operators.
The ANY operator compares every value returned by the subquery. (*)
The ANY operator can be used with the DISTINCT keyword.
12.
Multiple-row subqueries must have NOT, IN, or ANY in
the WHERE clause of the inner query. True or False? Mark for Review
(1)
Points
True
False (*)
13.
Group functions can be used in multiple-row subqueries
in the HAVING and GROUP BY clauses. True or
False? Mark for Review
(1)
Points
True (*)
False
14.
The salary column of the f_staffs table contains the
following values:
4000
5050
6000
11000
23000
Which of
the following statements will return the last_name and first_name of those
employees who earn more than 5000?
Mark
for Review
(1)
Points
SELECT last_name, first_name
FROM
f_staffs
WHERE
salary = (SELECT salary FROM f_staffs WHERE salary < 5000);
SELECT last_name, first_name
FROM
f_staffs
WHERE
salary = (SELECT salary FROM f_staffs WHERE salary > 5000);
SELECT last_name, first_name
FROM
f_staffs
WHERE
salary IN (SELECT salary FROM f_staffs WHERE salary > 5000);
(*)
SELECT last_name, first_name
FROM
f_staffs
WHERE
salary IN
(SELECT
last_name, first_name FROM f_staffs WHERE salary <5000 o:p="">
Correct
Correct
15. You need to create a SELECT statement that
contains a multiple-row subquery. Which comparison operator(s) can you
use? Mark for Review
(1)
Points
LIKE
IN, ANY, and ALL (*)
=, <, and >
BETWEENﾅANDﾅ
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