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Qu'est-ce (qui) est domain calculus - définition

CALCULUS FOR THE RELATIONAL DATA MODEL

Domain calculus

domain calculus

<database> A form of relational calculus in which scalar variables take values drawn from a given domain. Examples of the domain calculus are ILL, FQL, DEDUCE and the well known Query By Example (QBE). INGRES is a relational DBMS whose DML is based on the relational calculus.

Domain relational calculus

In computer science, domain relational calculus (DRC) is a calculus that was introduced by Michel Lacroix and Alain Pirotte as a declarative database query language for the relational data model.Michel Lacroix, Alain Pirotte: Domain-Oriented Relational Languages.

https://en.wikipedia.org/wiki/Domain_relational_calculus

Felicific calculus

ALGORITHM MEASURING THE AMOUNT OF PLEASURE THAT A SPECIFIC ACTION IS LIKELY TO CAUSE

Utility calculus; Hedonic calculus; Hedonic Calculus; Hedonistic calculus; Hedon (unit); Mathematics of philosophy; Hedons and dolor; Pleasure calculus; Utilitarian calculus

The felicific calculus is an algorithm formulated by utilitarian philosopher Jeremy Bentham (1747–1832) for calculating the degree or amount of pleasure that a specific action is likely to induce. Bentham, an ethical hedonist, believed the moral rightness or wrongness of an action to be a function of the amount of pleasure or pain that it produced.

https://en.wikipedia.org/wiki/Felicific_calculus

Wikipédia

Domain relational calculus

In computer science, domain relational calculus (DRC) is a calculus that was introduced by Michel Lacroix and Alain Pirotte as a declarative database query language for the relational data model.

In DRC, queries have the form:

\{\langle X_{1},X_{2},....,X_{n}\rangle \mid p(\langle X_{1},X_{2},....,X_{n}\rangle )\}

where each X_i is either a domain variable or constant, and $p(\langle X_{1},X_{2},....,X_{n}\rangle )$ denotes a DRC formula. The result of the query is the set of tuples X₁ to X_n that make the DRC formula true.

This language uses the same operators as tuple calculus, the logical connectives ∧ (and), ∨ (or) and ¬ (not). The existential quantifier (∃) and the universal quantifier (∀) can be used to bind the variables.

Its computational expressiveness is equivalent to that of relational algebra.

https://en.wikipedia.org/wiki/Domain relational calculus