
Exámen Diagnostico MBD
Quiz
•
Computers
•
University
•
Practice Problem
•
Hard
Israel Castañon
Used 1+ times
FREE Resource
Enhance your content in a minute
20 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Cuál de los siguientes sublenguajes se utiliza para consultar información en una base de datos?
DCL
DDL
DML
TCL
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Qué operador del álgebra relacional permite seleccionar columnas específicas?
Unión
Selección
Proyección
Intersección
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Cuál es el propósito de una clave primaria?
Permitir valores nulos
Crear relaciones entre tablas
Identificar de forma única cada fila
Validar el tipo de dato
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Qué instrucción SQL se usa para eliminar una tabla?
REMOVE
ERASE
DELETE
DROP
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
En el modelo relacional, una relación es equivalente a:
Un archivo
Una columna
Una tabla
Una fila
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Qué comando T-SQL se usa para modificar la estructura de una tabla?
UPDATE
MODIFY
ALTER
CHANGE
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Cuál es la diferencia principal entre DDL y DML?
DML crea tablas; DDL consulta datos
DDL modifica datos; DML estructura
DDL estructura objetos; DML manipula datos
No hay diferencia
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