
FUNDAMENTOS DE SQL & BI (07.10)
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Professional Development
Professional Development
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Es un comando SQL de DML (Data Manipulation Language)
Drop
Alter
Truncate
Update
2.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Es un comando SQL de DCL (Data Control Language)
Drop
Delete
Roll Back
Grant
3.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Combina filas de 2 o más tablas en función de una condición específica y devuelve solo las filas que cumplen con esa condición
Left join
Right join
Merge outer join
Inner join
4.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Es una función agregada que se utiliza para calcular el promedio de los valores de un campo determinado
Max
Count
Avg
Like
5.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Queremos saber los 5 primeros condados con las mayores poblaciones. ¿Cuál consulta SQL es el correcto?
SELECT TOP 5 * FROM counties
ORDER BY population DESC
SELECT * FROM counties
ORDER BY population
Limit 5
SELECT * FROM counties
ORDER BY population
Limit 5
SELECT TOP 5 * FROM counties
ORDER BY desc population
6.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Queremos saber el numero de estados por cada región. ¿Cuál consulta SQL es el correcto?
SELECT count(DISTINCT state) AS count_state
FROM counties
SELECT region, count(state) AS count_state
FROM counties
GROUP BY región
SELECT region, count(DISTINCT state) AS count_state
FROM counties
GROUP BY región
2 alternativas son correctas
7.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
¿Cuál es la diferencia entre having y where?
WHERE opera sobre registros individuales, mientras que HAVING lo hace sobre un grupo de registros.
HAVING se utiliza para ordenar filas de manera ascendente, mientras que WHERE se utiliza para ordenar filas de manera descendente.
HAVING y WHERE son intercambiables y se pueden usar indistintamente en cualquier consulta SQL sin diferencia real.
HAVING opera sobre registros individuales, mientras que WHERE lo hace sobre un grupo de registros.
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