Please use this identifier to cite or link to this item:
|Title:||AN EXTENDED RELATIONAL DATA MODEL AND SQL SUBSET WITH SUPPORT FOR CONTAINMENT, COMPOSITE STRUCTURES AND INHERITANCE|
|Abstract:||An extended relational data base model and SQL subset is described. The data model is fully relational. It allows unnormalized relations only where attributes are sets or lists of atomic attributes. There is support for both inheritance and composite entities. A composite structre can be stored by decomposition into sets of tuples stores in relations but can also be stored virtually as a view. Composite structures, including OOPL objects, can be transferred directly between database system and program variables. Manipulation languages are an extended SQL and a separate new SQL language subset for efficient manipulation of containment structures, whose manipulation with SQL is error-prone. The language subset has a predicate calculus expression structure, but allows the use of genitive relations to model containment relationships and facilitate application of natural quantifiers to containment sets. Range variables are allowed and can range over genitive relations as well as base tables.|
|Appears in Collections:||Bradley, James|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.