The functional data model and the data languages DAPLEX
ACM Transactions on Database Systems (TODS)
On optimizing an SQL-like nested query
ACM Transactions on Database Systems (TODS)
The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
The design and implementation of INGRES
ACM Transactions on Database Systems (TODS)
SIGMOD '83 Proceedings of the 1983 ACM SIGMOD international conference on Management of data
An implementation of GEM: supporting a semantic data model on a relational back-end.
SIGMOD '84 Proceedings of the 1984 ACM SIGMOD international conference on Management of data
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This paper introduces the query language ARIEL, a language which retains the formal precision of relational languages such as SQL and QUEL, while exploiting the greater expressiveness of a semantic data model. ARIEL has been implemented as a front-end query language to several relational database systems, including to a front-end distributed DBMS being developed at SDC. The most noteworthy elements of ARIEL are (1) a flexible syntax for expressing subqueries, (2) a convenient way to express "outer-joins" within a non-procedural framework (without the use of "null values"), (3) a comprehensive set of rules for defining the semantics of "reference chains", (4)a "light-weight" view mechanism, and (5) a clean semantics for expressing aggregate functions, especially in combination with the "group by" operator.