
CONSULTAS_SQL_2324
Authored by Cristina EsMo
Computers
Professional Development
Used 28+ times

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18 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
El lenguaje utilizado para crear la estructura de las bases de datos es:
DDL
DML
SQL
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
El lenguaje para crear consultas de bases de datos es el
DDL
DML
SQL
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
La sentencia para otorgar permisos a un usuario es:
Grant
Revoke
Privilege
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
La restricción numLicencia_PK indicará:
que es clave foránea
que es clave primaria
que no es nulo
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Qué hace la sentencia siguiente?
DROP TABLE Tabla;
Elimina la tabla del sistema
Hace una partición de la tabla
Vacía completamente de datos la tabla, pero no su estructura
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Cuál es la diferencia entre las funciones SUM y COUNT?
No hay diferencia, las dos cuentan el valor de un grupo igual o distinto
La primera suma cantidades (si son numéricos) y la segunda cuenta el número de valores que hay (ocurrencias)
Sólo se pueden aplicar a valores numéricos
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Qué hace la cláusula HAVING en una consulta?
Filtra filas de la tabla o tablas de la consulta
Filtra grupos del agrupamiento hecho en el GROUP BY
Selecciona columnas del grupo
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