TEST DE SQL

1. What does SQL stand for?

Rta. Structured Query Language

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

Rta. SELECT

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

Rta. UPDATE

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

Rta. DELETE

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

Rta. INSERT INTO

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

Rta. SELECT FirstName FROM Persons

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

Rta. 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"?

Rta. 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"?

Rta. 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

Rta. 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"?

Rta. SELECT FirstName='Peter', LastName='Jackson' FROM Persons

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"?

Rta. SELECT * FROM Persons WHERE LastName BETWEEN 'Hansen' AND 'Pettersen'

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

Rta. SELECT DISTINCT

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

Rta. ORDER BY

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

Rta. SELECT * FROM Persons ORDER BY FirstName DESC

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

Rta. INSERT INTO Persons VALUES ('Jimmy', 'Jackson')

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

Rta. INSERT INTO Persons (LastName) VALUES ('Olsen')

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

Rta. UPDATE Persons SET LastName='Hansen' INTO LastName='Nilsen'

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

Rta. DELETE FROM Persons WHERE FirstName = 'Peter'

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

Rta. SELECT COUNT(*) FROM Persons