lunes, 20 de diciembre de 2010

La razón de utilizar varchar en los campos teléfono o cédula de identidad en base de datos – Virtual – Hosting – Shipping

Nunca aprendí bienbase de datos y la semana pasada me dijoJuan Bauer que el programador/desarrolladorDEBE saber Base da datos. El tiene mucha razón, siempre supe pero nunca le quise dar importancia a esto. En estos días estoy jugando conPostgreSQL.
Una de las primeras dudas recuerdo cuando daba la materia de base de datos en la facultad, es que tipo de datos utilizo para los campos teléfono o cédula de identidad.
Cuando una persona empieza con base de datos y necesita definir un tipo de dato en uno de estos campos, lo primero que se le viene a la mente es utilizarinterger, porque son números. Y la verdad que es lo más lógico en cierto sentido. Después de un tiempo de utilizar base de datos y por arte de magia al utilizar uno de los dos campos le ponía el tipo de datovarchar,cadena ostring.
En estos días, después de leer bastante en Internet encontré la respuesta correcta de la razón del porque utilizar varchar en los campos teléfono o cédula de identidad, y la razón es porque en estos números no se realizanOPERACIONES. Parece muy lógico pero muchas veces no se nos viene a la mente, o por lo menos a mi.XD

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