Evaluación BDD

Desarrollo de Conocimientos

1. Sobre la mecánica del uso de una base de datos centralizada en red.

Plantee y presente como resolver problemas del control de la concurrencia de una base de datos.


2. Presente algún esquema de recuperación de fallos en el sector productivo.


3. Enúmere y enuncie algunos de los conceptos básicos sobre bases de datos distribuidas.


4. Enuncie las reglas para el diseño de bases de datos distribuidas, proponga un diseño.


5. Plantee las estrategias para optimizar consultas en un sistema distribuido de bases de datos.


6. Sobre la mecánica del uso de una base de datos distribuida, enuncie las técnicas para el control de la concurrencia
y la recuperación de fallos, y compararela con las de un sistema centralizado.


Entregue en una hoja con su nombre y publique en su blog.



1. What does SQL stand for?

Strong Question Language
Structured Query Language
Structured Question Language

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

OPEN
SELECT
EXTRACT
GET


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

MODIFY
SAVE AS
SAVE
UPDATE
4. Which SQL statement is used to delete data from a database?

REMOVE
COLLAPSE
DELETE

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

ADD NEW
INSERT NEW
ADD RECORD
INSERT INTO

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

EXTRACT FirstName FROM Persons
SELECT Persons.FirstName
SELECT FirstName FROM Persons

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

SELECT [all] FROM Persons
SELECT * FROM Persons
SELECT Persons
SELECT *.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"?

SELECT * FROM Persons WHERE FirstName LIKE 'Peter'
SELECT * FROM Persons WHERE FirstName='Peter'
SELECT [all] FROM Persons WHERE FirstName LIKE 'Peter'
SELECT [all] 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"?

SELECT * FROM Persons WHERE FirstName LIKE 'a%'
SELECT * FROM Persons WHERE FirstName='a'
SELECT * FROM Persons WHERE FirstName='%a%'
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

True
False





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"?

SELECT * FROM Persons WHERE FirstName='Peter' AND LastName='Jackson'
SELECT FirstName='Peter', LastName='Jackson' FROM Persons
SELECT * FROM Persons WHERE FirstName LIKE 'Peter' AND LastName LIKE '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"?

SELECT * FROM Persons WHERE LastName BETWEEN 'Hansen' AND 'Pettersen'
SELECT * FROM Persons WHERE LastName>'Hansen' AND LastName<'Pettersen'
SELECT LastName>'Hansen' AND LastName<'Pettersen' FROM Persons


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

SELECT DIFFERENT
SELECT UNIQUE
SELECT DISTINCT


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

ORDER BY
SORT BY
SORT
ORDER


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

SELECT * FROM Persons SORT BY 'FirstName' DESC
SELECT * FROM Persons ORDER FirstName DESC
SELECT * FROM Persons ORDER BY FirstName DESC
SELECT * FROM Persons SORT 'FirstName' DESC


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

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

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

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

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

UPDATE Persons SET LastName='Nilsen' WHERE LastName='Hansen'
MODIFY Persons SET LastName='Nilsen' WHERE LastName='Hansen'
UPDATE Persons SET LastName='Hansen' INTO LastName='Nilsen'
MODIFY 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?

DELETE ROW FirstName='Peter' FROM Persons
DELETE FirstName='Peter' FROM Persons
DELETE FROM Persons WHERE FirstName = 'Peter'

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

SELECT COLUMNS() FROM Persons
SELECT COLUMNS(*) FROM Persons
SELECT COUNT() FROM Persons
SELECT COUNT(*) FROM Persons