Recently proposed visual systems which allow a user to extract information by means of interactive graphical commands, have not yet been able to combine ease of use and high expressive power. The QBD* (Query By Diagram) system tries to overcome the above limitations. It balances a high expressive power with a noticeable facility of use. A systematic study has been performed to establish the effectiveness of the QBD* environment. The study involved 90 non experts in computer science (undergraduate students, employees, and professional persons). Two tutorials have been designed, introducing the SQL language and the QBD* environment, respectively.
Query by diagram: a graphical environment for querying databases / Catarci, Tiziana; Santucci, Giuseppe. - STAMPA. - 23:2(1994), p. 515. (Intervento presentato al convegno Proceedings of the 1994 ACM SIGMOD International Conference on Management of Data tenutosi a Minneapolis, MN, USA nel 24 May 1994 through 27 May 1994).
Query by diagram: a graphical environment for querying databases
CATARCI, Tiziana;SANTUCCI, Giuseppe
1994
Abstract
Recently proposed visual systems which allow a user to extract information by means of interactive graphical commands, have not yet been able to combine ease of use and high expressive power. The QBD* (Query By Diagram) system tries to overcome the above limitations. It balances a high expressive power with a noticeable facility of use. A systematic study has been performed to establish the effectiveness of the QBD* environment. The study involved 90 non experts in computer science (undergraduate students, employees, and professional persons). Two tutorials have been designed, introducing the SQL language and the QBD* environment, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
