System R: relational approach to database management
ACM Transactions on Database Systems (TODS)
Some high level language constructs for data of type relation
ACM Transactions on Database Systems (TODS)
User performance considerations in DBMS selection
SIGMOD '77 Proceedings of the 1977 ACM SIGMOD international conference on Management of data
Design of a user interface for a relational data base.
Design of a user interface for a relational data base.
Traversal recursion: a practical approach to supporting recursive applications
SIGMOD '86 Proceedings of the 1986 ACM SIGMOD international conference on Management of data
Querying part hierarchies: a knowledge-based approach
DAC '87 Proceedings of the 24th ACM/IEEE Design Automation Conference
A graphical query language supporting recursion
SIGMOD '87 Proceedings of the 1987 ACM SIGMOD international conference on Management of data
Alpha: An Extension of Relational Algebra to Express a Class of Recursive Queries
IEEE Transactions on Software Engineering
Prolog-Based Meta-rules for Relational Database Representation and Manipulation
IEEE Transactions on Software Engineering
Extending SQL with General Transitive Closure and Extreme Value Selections
IEEE Transactions on Knowledge and Data Engineering
RQL: A Recursive Query Language
IEEE Transactions on Knowledge and Data Engineering
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
G-WHIZ, a visual interface for the functional model with recursion
VLDB '85 Proceedings of the 11th international conference on Very Large Data Bases - Volume 11
| Hi-index | 0.00 |
The role of the external schema is to support user views of data and thus to provide programmers with easier data access. This author believes that an external schema facility is best based on hierarchies, both simple and recursive. After a brief introduction to an external schema facility to support simple hierarchical user views, the requirements for a facility for recursive hierarchies are listed and the necessary extensions to the external schema definition language are offered.Functions that must be provided for generality in definition are node specification and node control. Tree traversal functions must be provided for processing. Definitions of each and examples of use are presented.