
Repaso DQL
Authored by Diego Viver
Computers
Professional Development
Used 1+ times

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21 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Qué función nos permite dividir un rango en N partes iguales, de manera que a cada fila se le asigna un número de 1 a N?
NTILE(N)
PERCENTILE_DISC(N)
PERCENTILE_CONT(N)
MEDIAN(N)
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Selecciona la palabra clave que nos permite definir los espacios de aplicación de una función de ventana
OVER
IN
OFFSET
ALONG
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Elige la afirmación correcta
WHERE va después de GROUP BY
ORDER BY va antes de JOIN
FROM va después de LIMIT
HAVING va después de GROUP BY
4.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Queremos seleccionar todas las fechas que estén en el año 2021 (dos correctas):
WHERE fecha BETWEEN "2021-01-01" AND "2021-12-31"
WHERE fecha BETWEEN "2021-01-01" AND "2022-01-01"
WHERE fecha > "2021-01-01" AND fecha < "2021-12-31"
WHERE fecha > "2019-12-31" AND fecha < "2022-01-01"
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Qué le falta a la siguiente cláusula CASE?
CASE
WHEN nombre LIKE "A%" THEN "Empieza por A"
WHEN nombre LIKE "Z%" THEN "Empieza por Z"
END
ELSE
ELSE y END
FROM
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Cuántas filas devolverá la siguiente consulta?
SELECT * FROM notas;
1
2
42
Tantas como filas tenga la tabla notas
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Cuántas filas devolverá la siguiente consulta?
SELECT AVG(nota) FROM notas;
1
Tantas como filas tenga la tabla notas
Está mal escrita
42
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