The functional data model and the data languages DAPLEX
ACM Transactions on Database Systems (TODS)
Design of an external schema facility to define and process recursive structures
ACM Transactions on Database Systems (TODS)
Database abstractions: aggregation and generalization
ACM Transactions on Database Systems (TODS)
Universality of data retrieval languages
POPL '79 Proceedings of the 6th ACM SIGACT-SIGPLAN symposium on Principles of programming languages
Non first normal form relations to represent hierarchically organized data
PODS '84 Proceedings of the 3rd ACM SIGACT-SIGMOD symposium on Principles of database systems
An Example of Knowledge-Based Query Processing in a CAD/CAM DBMS
VLDB '84 Proceedings of the 10th International Conference on Very Large Data Bases
Theory of Relational Databases
Theory of Relational Databases
Towards a unified visual database access
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
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G-WHIZ is a QBE-style interface for the functional data model, with extensions that sup- port recursively defined structures such as part hierarchies. Explicit joins are rarely needed because set-valued and entity-valued functions of the functional model are supported. The recur-sive facilities are integrated with the rest of the language. G-WHIZ currently is being implemented as the user interface to a CAD/CAM DBMS.