Upwork MySQL 5.0 Test Answers

1. What does SQL stand for?

c)   Structured Query Language

2. Which SQL statement is used to extract data from a database?

d)   SELECT

3. Which SQL statement is used to update data in a database?

a)  UPDATE

4. Which SQL statement is used to delete data from a database?

b) DELETE

5. Which SQL statement is used to insert new data in a database?

c)  INSERT

6. With SQL, how do you select a column named “FirstName” from a table named “Persons”?

b)  SELECT FirstName FROM Persons

7. With SQL, how do you select all the columns from a table named “Persons”?

d)  SELECT * FROM Persons

8. With SQL, how do you select all the records from a table named “Persons” where the value of the column “FirstName” is “Peter”?

eter’

d)SELECT * FROM Persons WHERE FirstName=’Peter’

9. With SQL, how do you select all the records from a table named “Persons” where the value of the column “FirstName” starts with an “a”?

d) SELECT * FROM Persons WHERE FirstName LIKE ‘a%’

10. The OR operator displays a record if ANY conditions listed are true. The AND operator displays a record if ALL of the conditions listed are true

a) True

11. With SQL, how do you select all the records from a table named “Persons” where the “FirstName” is “Peter” and the “LastName” is “Jackson”?

b)   SELECT * FROM Persons WHERE FirstName=’Peter’ AND LastName=’Jackson’

12. With SQL, how do you select all the records from a table named “Persons” where the “LastName” is alphabetically between (and including) “Hansen” and “Pettersen”?

b) SELECT * FROM Persons WHERE LastName BETWEEN ‘Hansen’ AND ‘Pettersen’

13. Which SQL statement is used to return only different values?

d)  SELECT DISTINCT

14. Which SQL keyword is used to sort the result-set?

c)  ORDER BY

15. With SQL, how can you return all the records from a table named “Persons” sorted descending by “FirstName”?

b) SELECT * FROM Persons ORDER BY FirstName DESC

16. With SQL, how can you insert a new record into the “Persons” table?

a)  INSERT INTO Persons VALUES (‘Jimmy’, ‘Jackson’)

17. With SQL, how can you insert “Olsen” as the “LastName” in the “Persons” table?

a)  INSERT INTO Persons (LastName) VALUES (‘Olsen’)

18. How can you change “Hansen” into “Nilsen” in the “LastName” column in the Persons table?

b) UPDATE Persons SET LastName=’Nilsen’ WHERE LastName=’Hansen’

19. With SQL, how can you delete the records where the “FirstName” is “Peter” in the Persons Table?

 a)  DELETE FROM Persons WHERE FirstName = ‘Peter’

20. With SQL, how can you return the number of records in the “Persons” table?

b) SELECT COUNT(*) FROM Persons

21. Given an employees table as follows: empid name managerid a1 bob NULL b1 jim a1 B2 tom a1 What value will select count(*) from employees return?

c) 3

22. The result of a SELECT statement can contain duplicate rows.

a)  True

23. Sometimes the expression “select count(*)” will return fewer rows than the expression “select count(value)”.

b) False

24. What type of lock will deny users any access to a table?

c) EXCLUSIVE

25. Which of the following is the correct SQL statement to use to remove rows from a table?

c) DELETE

26. The only way to join two tables is by using standard, ANSI syntax.

b) False

27. A NULL value is treated as a blank or 0.

b) False

28. The left outer join is one type of outer join. Another one is the.

e) all of the above