By Martin Gogolla
This textual content provides a entire creation to a longer Entity-Relationship version either on a conceptual and on a proper, mathematicallevel. as well as the primitives given through the knowledge version the textual content introduces a language for the formula of constraints with the intention to limit database states to constant ones. The textual content explains an implementation of the procedure selected within the good judgment programing language PROLOG and discusses during this context the computational strength of the proposedcalculus. The prolonged Entity-Relationship calculus is used to outline the that means of the relational question language SQL. a pleasant characteristic of the process is that it turns into attainable to end up language houses on a legitimate mathematical basis.
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Extra info for An Extended Entity-Relationship Model: Fundamentals and Pragmatics
TERM](v,a) := a(v). ii. ,xn) then x/ else I f i . iii. #[WERM](sou~(tin),a):= i f 3 e E ,[ENTTYPE](so~t) with #[CONSTRUCTION] (c)(_e)=p[TERM] (ti,~,a) then e else • fi. iv. #[TERM](si,(to~,),a):= i f , [ C O N S T R U C T I O N ] (c) (,[TERM] (toot,a)) E , [ E N T T Y P E ] (s,~) t h e n ,[CONSTRUCTION](c)(#[TERM](to~t,a)) e l s e • f i . v. ,,[TERM](t~,a)). vi. ,t~ [dl A ... ,#[TERM] (t~,a')) [ there is c~' E ASSIGN with ~ ' ( v ) - - a ( v ) for v E VAR-(decl(dl) U ... U decl(dk)) and (dl,a') E ,[DECL] and ...
8 by an oval similar to attributes, but we have added an extra arrow pointing to the corresponding entity type rectangle. 8: Graphical representation of components. 9 by a triangle connecting the input types at the base line and the output types at the opposite point. 26 C H A P T E R 2. 9: Graphical representation of type constructions. 1. 19 where our extended Entity-Relationship approach is specified by means of the extended EntityRelationship model. 17 Remark: Components One can also further restrict the possible interpretations of C O M P O N E N T functions in the following way.
7 by an oval (with the attribute name and the corresponding data type) connected to the entity type rectangle or the relationship diamond. 7: Graphical representation of attributes. 8 by an oval similar to attributes, but we have added an extra arrow pointing to the corresponding entity type rectangle. 8: Graphical representation of components. 9 by a triangle connecting the input types at the base line and the output types at the opposite point. 26 C H A P T E R 2. 9: Graphical representation of type constructions.