12.07.2015 Views

Basi di dati

Basi di dati

Basi di dati

SHOW MORE
SHOW LESS
  • No tags were found...

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

<strong>Basi</strong> <strong>di</strong> <strong>dati</strong> - Modelli e linguaggi <strong>di</strong> interrogazione- Paolo Atzeni, Stefano Ceri, Stefano Paraboschi, Riccardo TorloneCar<strong>di</strong>nalità <strong>di</strong> attributiCapitolo 6• E’ possibile associare delle car<strong>di</strong>nalitàanche agli attributi, con due scopi:• in<strong>di</strong>care opzionalità ("informazioneincompleta")• in<strong>di</strong>care attributi multivalore17/10/2002Copyright © 2002 - The McGraw-Hill Companies, srl

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!