On Semantic Issues in the Relational Model of Data

This paper discusses the semantics of Codd's relational model of data, considered as being time-independent properties of the relations describing the data. The paper emphasizes those properties which are expressible in terms of the relations present in the data base, as opposed to the properties which relate the data base to the outside world. Among the semantic properties being discussed are the functional dependencies, the weak dependencies, the integrity constraints and the cross-referencing of the data base entities.

[1]  E. F. Codd,et al.  Further Normalization of the Data Base Relational Model , 1971, Research Report / RJ / IBM / San Jose, California.

[2]  I. J. Heath.  Unacceptable file operations in a relational data base , 1971, SIGFIDET '71.

[3]  E. F. Codd,et al.  Normalized data base structure: a brief tutorial , 1971, SIGFIDET '71.

[4]  E. F. Codd,et al.  A data base sublanguage founded on the relational calculus , 1971, SIGFIDET '71.

[5]  E. F. Codd,et al.  Understanding relations , 1973, SGMD.

[6]  W. W. Armstrong,et al.  Dependency Structures of Data Base Relationships , 1974, IFIP Congress.

[7]  Donald D. Chamberlin,et al.  SEQUEL: A structured English query language , 1974, SIGFIDET '74.

[8]  E. F. Codd,et al.  Seven Steps to Rendezvous with the Casual User , 1974, IFIP Working Conference Data Base Management.

[9]  E. F. Codd,et al.  Recent Investigations in Relational Data Base Systems , 1974, ACM Pacific.

[10]  Philip A. Bernstein,et al.  A unified approach to functional dependencies and relations , 1975, SIGMOD '75.

[11]  John Mylopoulos,et al.  Semantic Networks and the Generation of Context , 1975, IJCAI.

[12]  John Mylopoulos.  TORUS - A Natural Language Understanding System For Data Management , 1975, IJCAI.

[13]  Donald D. Chamberlin,et al.  Functional specifications of a subsystem for data base integrity , 1975, VLDB '75.

[14]  Moshé M. Zloof.  Query by example , 1975, AFIPS '75.

[15]  Hans Albrecht Schmid,et al.  On the semantics of the relational data model , 1975, SIGMOD '75.

[16]  Philip A. Bernstein,et al.  Comment on "Decomposition of a Data Base and the Theory of Boolean Switching Functions" , 1977, IBM J. Res. Dev..