By Filippo Cacace, Gianfranco Lamperti (auth.)
This quantity goals to give contemporary advances in database expertise from the point of view of the unconventional database paradigms proposed within the final decade. It makes a speciality of the idea of the prolonged relational version and an instance of a longer relational database programming language, Algres, is defined. A unfastened reproduction of Algres enhances this paintings, and is offered on the web.
Audience: This paintings may be of curiosity to graduate scholars following complicated database classes, complicated data-oriented functions builders, and researchers within the box of database programming languages and software program engineering who want a versatile prototyping platform for the improvement of software program instruments.
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Additional info for Advanced Relational Programming
We first consider a few simple examples involving only atomic attributes . In this case the difference compared to the flat case is due to the need to determine at which level the tuples are selected . 4 Extended Relational Databases d_name 33 budget Rooms room_num tel Emnlovees e num 8000 D2 RI 56 R3 76 R2 74 107 109 108 110 106 I e name salary peter john iane arthur diana 800 800 800 800 1000 Figure 2-13 Result of CJbudget > 6000 (Dept) departments with a budget of 6000 or more. This query is trivially expressed by this selection: 0budget> 6000 (Dept) Since the attribute budget involved in the selection predicate is at the first level in the schema tree, this selection works exactly as in the flat case, generating the result displayed in Figure 2-13.
If the attributes are the first level our definition is trivially equivalent to the usual one. Consider for example a query requiring the extraction from Dept of the information regarding departments and their budget. This can be accomplished through a projection on the attributes d_name and budget that belong to the first level: red_name. budget (Dept) The result expected from this projection is given in Figure 2-11. Let us now formulate the same kind of query at the internal level, looking for room_num tel e room d_name R oom deo e dept e name budget e num Rl R2 R3 R4 56 74 76 82 Dl 5500 D2 8000 D2 Dl 8000 5500 D2 8000 102 104 107 109 106 103 105 108 Dl 5500 101 no I fred michael peter iohn diana david joe iane arthur emily salarv 800 800 800 800 1000 800 800 800 800 1000 Figure 2-10 Result OfVe_dept = (e_num.
1 Semantic Data Models Semantic data models, which were proposed in the early 1970s, extend the data modelling facilities of the relational model through several concepts, such as entity, relationship , and generalization. Recall that in the relational model the sole conceptual construct is the relation. Therefore, both entities and relationships of the real world have to be mapped onto relations. Looking at a relational database schema it is not in general evident which are the links (the relationships) among the different relations.
Advanced Relational Programming by Filippo Cacace, Gianfranco Lamperti (auth.)