
Examen de JOIN
Authored by ramon vargas
Computers
Professional Development
Used 5+ times

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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
En una sentencia INNER JOIN en Impala, ¿qué ocurre si no hay coincidencias entre las tablas?
Se devuelven todas las filas de ambas tablas.
Se devuelven solo las filas de la primera tabla.
Se devuelven solo las filas de la segunda tabla.
No se devuelven filas en el resultado.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿qué cláusula se utiliza para especificar la condición de unión en una sentencia JOIN?
WHERE
ON
JOIN
AND
3.
MULTIPLE CHOICE QUESTION
1 min • 3 pts
Si tenemos una tabla "colaboradores" con columnas "colaboradores_id" y "gerencia_id", y otra tabla "gerencias" con columnas "gerencia_id" y "nombre_gerencia", ¿cuál JOIN nos dará una lista de todos los colaboradores y los nombres de sus gerencias que solo coincidan?
RIGHT JOIN
INNER JOIN
FULL JOIN
LEFT JOIN
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Supongamos que tienes dos tablas: "Clientes" y "Pedidos".
¿Qué tipo de JOIN mostraría todos los clientes, incluso aquellos que no han realizado ningún pedido?
INNER JOIN
LEFT JOIN
RIGHT JOIN
FULL JOIN
5.
MULTIPLE CHOICE QUESTION
3 mins • 5 pts
Dada la siguiente estructura de tablas, ¿cuál sería la sentencia JOIN adecuada para combinarlas en función de la correspondencia del ID del departamento?
Tabla "Empleados": empleado_id, nombre, departamento_id
Tabla "Departamentos": departamento_id, nombre_departamento
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