Patrick Lafferty
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Correct of oracle assesment

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Patrick Lafferty
Created by Patrick Lafferty about 8 years ago
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Question 1 of 23

1

CUBE will cross-reference the columns listed in the ______ clause to create a superset of groups.

Select one of the following:

  • GROUP BY

  • WHERE

  • SELECT

Explanation

Question 2 of 23

1

You use GROUPING functions to:

Select one of the following:

  • Produce subtotal and cross-tabulated values

  • Identify the extra row values created by either a ROLLUP or CUBE operation

  • Aggregate rows using SUM, MIN, MAX, and COUNT

Explanation

Question 3 of 23

1

The EMPLOYEES table contains these columns:
ID_NUMBER NUMBER Primary Key
NAME VARCHAR2 (30)
DEPARTMENT_ID NUMBER
SALARY NUMBER (7,2)
HIRE_DATE DATE
Evaluate this SQL statement:
SELECT id_number, name, department_id, SUM(salary)
FROM employees
WHERE salary > 25000
GROUP BY department_id, id_number, name
ORDER BY hire_date;
Why will this statement cause an error?

Select one of the following:

  • The HAVING clause is missing.

  • The WHERE clause contains a syntax error.

  • The WHERE clause contains a syntax .

  • The HIRE_DATE column is NOT included in the GROUP BY clause.

Explanation

Question 4 of 23

1

The PRODUCTS table contains these columns:
PRODUCT_ID NUMBER(9) PK
CATEGORY_ID VARCHAR2(10)
LOCATION_ID NUMBER(9)
DESCRIPTION VARCHAR2(30)
COST NUMBER(7,2)
PRICE NUMBER(7,2)
QUANTITY NUMBER
You display the total of the extended costs for each product category by location.
You need to include only the products that have a price less than $25.00.
The extended cost of each item equals the quantity value multiplied by the cost value.
Which SQL statement will display the desired result?

Select one of the following:

  • SELECT category_id, SUM(cost * quantity) TOTAL,location_id
    FROM products
    WHERE price > 25.00
    GROUP BY category_id, location_id;

  • SELECT SUM(cost * quantity) TOTAL, location_id
    FROM products
    WHERE price < 25.00
    GROUP BY location_id;

  • SELECT category_id, SUM(cost * quantity) TOTAL, location_id
    FROM products
    WHERE price < 25.00
    GROUP BY category_id, location_id;

  • SELECT SUM(cost * quantity) TOTAL
    FROM products
    WHERE price < 25.00;

Explanation

Question 5 of 23

1

The PLAYERS and TEAMS tables contain these columns:
PLAYERS
PLAYER_ID NUMBER NOT NULL, PRIMARY KEY
LAST_NAME VARCHAR2 (30) NOT NULL
FIRST_NAME VARCHAR2 (25) NOT NULL
TEAM_ID NUMBER
POSITION VARCHAR2 (25)
TEAMS
TEAM_ID NUMBER NOT NULL, PRIMARY KEY
TEAM_NAME VARCHAR2 (25)
You need to create a report that lists the names of each team with more than three goal keepers.
Which SELECT statement will produce the desired result?

Select one of the following:

  • SELECT t.team_name, COUNT(p.player_id)
    FROM players p, teams t
    ON (p.team_id = t.team_id)
    WHERE UPPER(p.position) = 'GOAL KEEPER'
    GROUP BY t.team_name;

  • SELECT t.team_name, COUNT(p.player_id)
    FROM players
    JOIN teams t ON (p.team_id = t.team_id)
    WHERE UPPER(p.position) = 'GOAL KEEPER'
    HAVING COUNT(p.player_id) > 3;

  • SELECT t.team_name, COUNT(p.player_id)
    FROM players p, teams t
    ON (p.team_id = t.team_id)
    WHERE UPPER(p.position) = 'GOAL KEEPER'
    GROUP BY t.team_name
    HAVING COUNT(p.player_id) > 3;

  • SELECT t.team_name, COUNT(p.player_id)
    FROM players p
    JOIN teams t ON (p.team_id = t.team_id)
    WHERE UPPER(p.position) = 'GOAL KEEPER'
    GROUP BY t.team_name
    HAVING COUNT(p.player_id) > 3;

Explanation

Question 6 of 23

1

If a select list contains both a column as well as a group function then what clause is required?

Select one of the following:

  • HAVING clause

  • JOIN clause

  • ORDER BY clause

  • GROUP BY clause

Explanation

Question 7 of 23

1

Group functions can be nested to a depth of?

Select one of the following:

  • Three

  • Four

  • Two

  • Group function cannot be nested

Explanation

Question 8 of 23

1

The EMPLOYEES table contains the following columns:
EMPLOYEE_ID NUMBER(10) PRIMARY KEY
LAST_NAME VARCHAR2(20)
FIRST_NAME VARCHAR2(20)
DEPARTMENT VARCHAR2(20)
HIRE_DATE DATE
SALARY NUMBER(10)
You want to create a report that includes each employee's last name, employee identification number, date of hire, and salary. The report should include only those employees who have been with the company for more than one year and whose salary exceeds $40,000.
Which of the following SELECT statements will accomplish this task?

Select one of the following:

  • SELECT employee_id, last_name, salary
    FROM employees
    WHERE salary > 40000
    AND hire_date =
    (SELECT hire_date
    FROM employees
    WHERE (sysdate-hire_date) / 365 > 1);

  • SELECT employee_id, last_name, hire_date, salary
    FROM employees
    WHERE salary > 40000 AND hire_date =
    (SELECT hire_date
    FROM employees
    WHERE (sysdate-hire_date) / 365 > 1);

  • SELECT employee_id, last_name, hire_date, salary
    FROM employees
    WHERE salary > 40000
    AND (sysdate-hire_date) / 365 > 1;

  • SELECT employee_id, last_name, salary
    FROM employees
    WHERE salary > 40000
    AND hire_date IN (sysdate-hire_date) / 365 > 1);

Explanation

Question 9 of 23

1

Which statement about group functions is true?

Select one of the following:

  • Group functions ignore null values.

  • Group functions can only be used in a SELECT list.

  • Group functions can be used in a WHERE clause.

  • A query that includes a group function in the SELECT list must include a GROUP BY clause.

Explanation

Question 10 of 23

1

Evaluate this SELECT statement:
SELECT COUNT(employee_id), department_id
FROM employees
GROUP BY department_id;
You only want to include employees who earn more than 15000.
Which clause should you include in the SELECT statement?

Select one of the following:

  • WHERE salary > 15000

  • HAVING salary > 15000

  • WHERE SUM(salary) > 15000

  • HAVING SUM(salary) > 15000

Explanation

Question 11 of 23

1

Which comparison operator can only be used with a single-row subquery?

Select one of the following:

  • ANY

  • ALL

  • < >

  • IN

Explanation

Question 12 of 23

1

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.)

(Choose all correct answers)

Select one or more of the following:

  • SELECT *
    FROM class_assignments
    WHERE max_capacity = (SELECT AVG(max_capacity) FROM class_assignments);

  • SELECT *
    FROM teachers
    WHERE teacher_id = (SELECT teacher_id FROM class_assignments WHERE class_id = 45963);

  • SELECT *
    FROM teachers
    WHERE teacher_id = (SELECT teacher_id, class_assignments WHERE max_capacity > 0);

  • SELECT *
    FROM teachers
    WHERE teacher_id LIKE (SELECT teacher_id FROM class_assignments WHERE max_capacity > 1000);

  • SELECT *
    FROM class_assignments
    max_capacity = (SELECT AVG(max_capacity) FROM class_assignments GROUP BY teacher_id);

Explanation

Question 13 of 23

1

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?

Select one of the following:

  • SELECT product_name
    FROM products
    WHERE cost > (SELECT AVG(cost)
    FROM products);

  • SELECT product_name
    FROM products
    WHERE cost > AVG(cost);

  • 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);

Explanation

Question 14 of 23

1

Using a subquery in which clause will return a syntax error?

Select one of the following:

  • WHERE

  • FROM

  • HAVING

  • You can use subqueries in all of the above clauses.

Explanation

Question 15 of 23

1

Which statement about subqueries is true?

Select one of the following:

  • Subqueries should be enclosed in double quotation marks.

  • Subqueries cannot contain group functions.

  • Subqueries are often used in a WHERE clause to return values for an unknown conditional value.

  • Subqueries generally execute last, after the main or outer query executes.

Explanation

Question 16 of 23

1

Which statement is false?

Select one of the following:

  • The WITH clause retrieves the results of one or more query blocks.

  • 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.

Explanation

Question 17 of 23

1

Which answer is INCORRECT? The parent statement of a correlated subquery can be:

Select one of the following:

  • A SELECT statement

  • An INSERT statement

  • An UPDATE statement

  • A DELETE statement

Explanation

Question 18 of 23

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?

Select one of the following:

  • True
  • False

Explanation

Question 19 of 23

1

The STUDENTS table contains these columns:
STU_ID NUMBER(9) NOT NULL
LAST_NAME VARCHAR2 (30) NOT NULL
FIRST_NAME VARCHAR2 (25) NOT NULL
DOB DATE
STU_TYPE_ID VARCHAR2(1) NOT NULL
ENROLL_DATE DATE
You create another table, named FT_STUDENTS, with an identical structure.You want to insert all full-time students who have a STU_TYPE_ID value of "F" into the new table. You execute this INSERT statement:
INSERT INTO ft_students
(SELECT stu_id, last_name, first_name, dob, stu_type_id, enroll_date
FROM students
WHERE UPPER(stu_type_id) = 'F');
What is the result of executing this INSERT statement?

Select one of the following:

  • All full-time students are inserted into the FT_STUDENTS table.

  • An error occurs because the FT_STUDENTS table already exists.

  • An error occurs because you CANNOT use a subquery in an INSERT statement.

  • An error occurs because the INSERT statement does NOT contain a VALUES clause.

Explanation

Question 20 of 23

1

You have been instructed to add a new customer to the CUSTOMERS table. Because the new customer has not had a credit check, you should not add an amount to the CREDIT column.
The CUSTOMERS table contains these columns:
CUST_ID NUMBER(10)
COMPANY VARCHAR2(30)
CREDIT NUMBER(10)
POC VARCHAR2(30)
LOCATION VARCHAR2(30)
Which two INSERT statements will accomplish your objective?

(Choose all correct answers)

Select one or more of the following:

  • INSERT INTO customers (cust_id, company, poc, location)
    VALUES (200, 'InterCargo', 'tflanders', 'samerica');

  • INSERT INTO customers
    VALUES (200, 'InterCargo', null, 'tflanders', 'samerica');

  • INSERT INTO customers
    VALUES (cust_id, company, credit, poc, location) (200, 'InterCargo', 0, 'tflanders', 'samerica');

  • INSERT INTO customers
    VALUES (200, InterCargo, 0, tflanders, samerica);

Explanation

Question 21 of 23

1

Which two commands can be used to modify existing data in a database row?

(Choose all correct answers)

Select one or more of the following:

  • DELETE

  • MERGE

  • SELECT

  • UPDATE

Explanation

Question 22 of 23

1

You need to delete a record in the EMPLOYEES table for Tim Jones, whose unique employee identification number is 348. The EMPLOYEES table contains these columns:
EMPLOYEE_ID NUMBER(5) PRIMARY KEY
LAST_NAME VARCHAR2(20)
FIRST_NAME VARCHAR2(20)
ADDRESS VARCHAR2(30)
PHONE NUMBER(10)
Which DELETE statement will delete the appropriate record without deleting any additional records?

Select one of the following:

  • DELETE FROM employees
    WHERE employee_id = 348;

  • DELETE FROM employees
    WHERE last_name = jones;

  • DELETE *
    FROM employees
    WHERE employee_id = 348;

  • DELETE 'jones'
    FROM employees;

Explanation

Question 23 of 23

1

What keyword in an UPDATE statement specifies the column that you want to change?

Select one of the following:

  • SELECT

  • WHERE

  • SET

  • HAVING

Explanation

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