System R: relational approach to database management
ACM Transactions on Database Systems (TODS)
The design and implementation of INGRES
ACM Transactions on Database Systems (TODS)
A transformational grammar-based query processor for access control in a planning system
ACM Transactions on Database Systems (TODS)
Communications of the ACM
NUL: a Navigational User's Language for a network structured data base
SIGMOD '76 Proceedings of the 1976 ACM SIGMOD international conference on Management of data
PODS '87 Proceedings of the sixth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
ACM Transactions on Database Systems (TODS)
Semantics of query languages for network databases
ACM Transactions on Database Systems (TODS)
Supporting a Semantic Data Model in a Distributed Database System
VLDB '83 Proceedings of the 9th International Conference on Very Large Data Bases
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This paper describes CQLF (CODASYL Query Language, Flat) [MAN081]. CQLF is a high level language for accessing and manipulating data in databases described using the 1981 ANSI dpANS version of the CODASYL Data Description Language [ANSI81]. CQLF has similarities to typical relational languages, such as SQL [ASTR76, CHAM76] and QUEL [STON76]. CQLF provides capabilities for querying and operating on databases described both in a "relational style" (having no CODASYL sets, using only values to represent interrecord relationships, and having records with no arrays), and in a "network style" (using CODASYL sets to represent interrecord relationships, and having records containing arrays).