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SQL: SELECT, JOINS y AGG

Froggy Jumps

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Quiz de nivel medio sobre SQL

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Mexico

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SQL: SELECT, JOINS y AGG
 

Froggy Jumps

SQL: SELECT, JOINS y AGGOnline version

Quiz de nivel medio sobre SQL

by Luis Angel González Flores
1

¿Qué palabra clave se usa para combinar filas de dos tablas con una relación en SQL cuando la condición está en ambas tablas?

2

¿Qué tipo de JOIN devuelve filas cuando hay coincidencias en ambas tablas?

3

¿Qué tipo de JOIN devuelve todas las filas de la tabla izquierda y las coincidencias de la derecha, rellenando con NULL si no hay coincidencia?

4

¿Qué tipo de JOIN devuelve todas las filas de la tabla derecha y las coincidencias de la izquierda, rellenando con NULL si no hay coincidencia?

5

En una consulta, ¿qué opción de agrupación se usa para calcular agregados por grupos?

6

¿Qué cláusula se usa para filtrar grupos después de aplicar GROUP BY?

7

¿Cuál es una función de agregación típica para contar filas en un grupo?

8

¿Qué función de agregación devuelve la suma de una columna numérica?

9

¿Qué clave pregunta sobre cardinalidad en bases de datos?

10

¿Qué indica la cardinalidad alta en un diseño de base de datos?

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