10238132
Descripción
Fichas por dylan murphy, actualizado hace más de 1 año
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Creado por dylan murphy
hace casi 7 años
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| Pregunta | Respuesta |
| Primary Key- A unique identifier foreign Key- used as a link to other tables | Data structures made up of files files made up of records records made up of fields |
| Flat file database single table inefficient anomalies happen insertion update deletion | Relational Database more than 1 table links tables in a relationship key links tables |
| validation Reduce likelihood of erroneous rules to create procees of ensuring data entered into a database meets a certain rule or rule to reduce the input of erroneous data | Types of checks Presence- ensures that data must be entered in a field field length-details the number of characters in a field range check- used to ensure that data falls between two values Restricted access check- used to limit the user entry to a list of acceptable values |
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