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Desafío SQL: Sentencias

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Quiz de sentencias SQL

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Mexico

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Desafío SQL: Sentencias
 

Desafío SQL: SentenciasOnline version

Quiz de sentencias SQL

by Oscar Lira Uribe
1

¿Qué sentencia se usa para consultar datos de una o varias tablas?

2

¿Qué cláusula filtra filas en una consulta?

3

¿Qué declaración se usa para crear una nueva tabla?

4

¿Cómo se eliminan registros que cumplen una condición específica?

5

¿Qué cláusula agrupa filas para funciones agregadas?

6

¿Qué cláusula ordena el resultado de una consulta?

7

¿Qué operador se usa para filtrar con varias condiciones combinadas?

8

¿Qué sentencia modifica datos existentes en una tabla?

9

¿Qué instrucción se utiliza para insertar nuevos registros?

10

¿Qué cláusula se usa para evitar duplicados en resultados?

Explicación

La cláusula SELECT extrae datos; las otras modifican o insertan.

WHERE aplica condiciones; HAVING agrupa tras GROUP BY.

CREATE TABLE define estructura; las otras modifican o eliminan.

DELETE borra filas; DROP elimina tablas; TRUNCATE limpia tablas.

GROUP BY agrupa; HAVING filtra grupos.

ORDER BY ordena; GROUP BY agrupa.

AND/OR combinan condiciones; IN, BETWEEN, LIKE son operadores específicos.

UPDATE cambia valores; INSERT añade nuevos.

INSERT INTO añade filas a una tabla.

DISTINCT elimina duplicados en el conjunto.

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