An introduction to database systems: vol. I (4th ed.)
An introduction to database systems: vol. I (4th ed.)
Elements of statistical inference (6th ed.)
Elements of statistical inference (6th ed.)
Human factors comparison of a procedural and a nonprocedural query language
ACM Transactions on Database Systems (TODS)
Optimization of query evaluation algorithms
ACM Transactions on Database Systems (TODS)
Extending the database relational model to capture more meaning
ACM Transactions on Database Systems (TODS)
ACM Computing Surveys (CSUR)
Relational database: a practical foundation for productivity
Communications of the ACM
Optimizing the performance of a relational algebra database interface
Communications of the ACM
A relational model of data for large shared data banks
Communications of the ACM
Principles of Database Systems
Principles of Database Systems
APL: An Interactive Approach
Performance analysis of a relational data base management system
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
Access path selection in a relational database management system
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
LISP 1.5 Programmer's Manual
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Databases are an important part of many Computer Assisted Design (CAD) applications. Real world knowledge is often defined by a database which is managed by a database system. Unlike most traditional database applications, the CAD process involves significant amounts of scientific and engineering computation on database contents to produce a result. Existing standalone language database systems often cannot meet this computational need. Users can either forego the use of a database system and its conveniences or interface conventional Procedure Oriented Language (POL) programs to database systems for the computational work. This paper describes EXTRAS, a relational algebra query language with extensions for numerical computation. This language has the advantages of a unified approach to computation and database query capabilities and of offering a high level language for numerical computation based on relations.