B. García Simontti.
Introduccion
•
SQL es un leguaje declarativo.
•
Lenguaje de cuarta generación.
•
Estrictamente relacionado con BD.
•
Ansi e ISO.
Componentes.
•
Agente SQL.
•
Implementación SQL.
•
Cliente SQL.
B. García Simontti.
Modos de ejecución
•
Ejecución directa (Sql interactivo).
•
Ejecución incrustada o embebida.
•
Clientes gráficos.
•
Ejecución dinámica.
Proceso.
•
Se analiza la instrucción. (sintaxis)
•
Se comprueba el diccionario de datos.
•
Se optimiza.
•
Se ejecuta la sentencia y se muestra el resultado al
B. García Simontti.
Elementos.
•
Comandos
•
DML.
•
DQL.
•
DDL.
•
DCL.
•
Clausulas.
•
Operaciones.
•
Funciones.
•
Literales.
•
Metadatos.
martes 4 de octubre de 2011Normas de escritura.
•
No se distinguen entre mayúsculas y minúsculas.
•
Las instrucciones finalizan con el signo punto y
coma.
•
Se pueden tabular las lineas para facilitar la
lectura.
B. García Simontti.
DDL
Lenguaje de definición de datos.
Introducción.
•
Es la parte de SQL que se encarga de la
definición de datos del SGBD.
•
Creación, modificación y eliminación de los
objetos de una BD.
•
Cada usuario posee un esquema.
•
Ninguna instrucción DDL puede ser
B. García Simontti.
Creación de BD.
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•
Nombres:
•
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•
No deben tener más de 30 caracteres.
•
Solo se permiten letras del alfabeto, números o el underscore.
•
No puede haber dos tablas con el mismo nombre en el mismo
esquema.
B. García Simontti.
CREATE TABLE.
•
Es la orden SQL que permite crear una Tabla.
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Tipos de datos
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B. García Simontti.
Tipos de datos.
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