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Correct of oracle assesment
Patrick Lafferty
Quiz by Patrick Lafferty, updated more than 1 year ago
Patrick Lafferty
Created by Patrick Lafferty over 8 years ago
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Question 1

Question
CUBE will cross-reference the columns listed in the ______ clause to create a superset of groups.
Answer
  • GROUP BY
  • WHERE
  • SELECT

Question 2

Question
You use GROUPING functions to:
Answer
  • 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

Question 3

Question
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?
Answer
  • 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.

Question 4

Question
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?
Answer
  • 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;

Question 5

Question
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?
Answer
  • 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;

Question 6

Question
If a select list contains both a column as well as a group function then what clause is required?
Answer
  • HAVING clause
  • JOIN clause
  • ORDER BY clause
  • GROUP BY clause

Question 7

Question
Group functions can be nested to a depth of?
Answer
  • Three
  • Four
  • Two
  • Group function cannot be nested

Question 8

Question
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?
Answer
  • 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);

Question 9

Question
Which statement about group functions is true?
Answer
  • 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.

Question 10

Question
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?
Answer
  • WHERE salary > 15000
  • HAVING salary > 15000
  • WHERE SUM(salary) > 15000
  • HAVING SUM(salary) > 15000

Question 11

Question
Which comparison operator can only be used with a single-row subquery?
Answer
  • ANY
  • ALL
  • < >
  • IN

Question 12

Question
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)
Answer
  • 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);

Question 13

Question
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?
Answer
  • 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);

Question 14

Question
Using a subquery in which clause will return a syntax error?
Answer
  • WHERE
  • FROM
  • HAVING
  • You can use subqueries in all of the above clauses.

Question 15

Question
Which statement about subqueries is true?
Answer
  • 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.

Question 16

Question
Which statement is false?
Answer
  • 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.

Question 17

Question
Which answer is INCORRECT? The parent statement of a correlated subquery can be:
Answer
  • A SELECT statement
  • An INSERT statement
  • An UPDATE statement
  • A DELETE statement

Question 18

Question
The Oracle server performs a correlated subquery when the subquery references a column from a table referred to in the parent. True or False?
Answer
  • True
  • False

Question 19

Question
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?
Answer
  • 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.

Question 20

Question
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)
Answer
  • 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);

Question 21

Question
Which two commands can be used to modify existing data in a database row? (Choose all correct answers)
Answer
  • DELETE
  • MERGE
  • SELECT
  • UPDATE

Question 22

Question
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?
Answer
  • 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;

Question 23

Question
What keyword in an UPDATE statement specifies the column that you want to change?
Answer
  • SELECT
  • WHERE
  • SET
  • HAVING
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