2007/05/30

TEST SQL




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



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REPRESENTACION DIAGRAMA E-R

REPRESENTACION DIAGRAMA E-R

FRASES DE RELACION DE ESTE MODELO E-R

FRASES DE RELACION DE ESTE MODELO E-R

III. DIAGRAMA ENTIDAD - RELACION

III. DIAGRAMA ENTIDAD - RELACION

DISEÑO DE BASES DE DATOS DISTRIBUIDAS

DISEÑO FISICO

El diseño físico parte del esquema lógico y da como resultado un esquema físico. Es una descripción de cómo está almacenada la base de datos en la memoria secundaria; describe las estructuras de almacenamiento y los métodos usados para tener un acceso efectivo a los datos. Los esquemas lógicos y físicos se expresan haciendo uso del lenguaje de definición de datos del DBMS elegido; la base de datos se crea y se carga, y puede ser probada. Lo mismo, puede probarse las aplicaciones sobre la base de datos y de este modo la base de datos se vuelve operacional.

DISEÑO LÓGICO

Parte del esquema conceptual y da como resultado el esquema lógico. El esquema lógico es una descripción de la estructura de la base de datos que puede procesar el software DBMS. El modelo lógico más usado actualmente, es el modelo relacional que ha sido enriquecido con los modelos orientados por objetos. El modelo lógico no depende del DBMS en particular, sino del modelo de datos usado por el DBMS.

DISEÑO CONCEPTUAL

Parte de la especificación de requerimientos y su resultado es el esquema conceptual, cuyo propósito es describir el contenido de información de la base de datos, más que las estructuras de almacenamiento que se necesitarán para manejar la información. Es una descripción de alto nivel que es completamente independiente del software de DBMS que se use, incluso si se pensara en implementar con archivos tradicionales y con algún lengauje de programación convencional.

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