Databases for Production Management by R. Companys, P. Falster, J. L. Burbidge

By R. Companys, P. Falster, J. L. Burbidge

Facing many elements of the layout, implementation and operation of databases for construction administration platforms, this e-book provides study that's very important to all these shortly fascinated with the computerisation of creation administration.

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S of Eac h relationshi p attribut e will als o hav e th e interna l identifier s of entitie s connecte d b y th e association . Fo r example , th e associatio n attribut e Ordered_q ' (ordere d quantit y of a lin e order ) woul d b e expressed : ordered_q(ID 1 ,ID2,QTO,T):-line(ID 1 ,ID2,T) , n_order(ID1,NO,T),pd_code(ID2,PDC,T) makeJine(NO,PDC,QTO,_) . , Externa l key s coul d hav e bee n use d instea d of interna l identifiers , bu t w e conside r tha t its us e ha s certai n disadvantages : - Furthe r evolution s of th e syste m ar e difficulted , th e mos t importan t bein g a chang e o f a n entit y externa l key , tha t woul d caus e a chang e in ever y predicat e relate d to thi s entity .

Neede d whe n P E R F U M E X send s a n orde r t o a supplier . It include s th e orde r number , th e supplier , a propose d deliver y date , th e product s to b e receive d an d th e neede d quantit y fo r eac h on e of them . - Delivery . Happen s whe n a supplie r deliver s ordere d products . It contain s th e orde r numbe r o f th e product s delivered , th e actuall y delivere d product s an d th e quantitie s arrive d fo r eac h o f them . An orde r ca n b e delivere d in mor e tha n on e time , bu t th e tota l delivere d quantit y fo r a produc t in a n a n orde r canno t b e greate r tha n th e quantit y ordered .

Predefine d querie s hav e a n importan t rol e i n easin i s hardl y useful) everyda y databas e use . n s y e y y g Th e possibilit y o f definin g dat a manipulatio n an d integrit y constraint s wit h th e conceptua l schem a facilitate s th e specificatio n o f al l th e relevan t characteristic s detecte d b y th e databas e designer , a t th e conceptua l definitio n phase . Fo r prototyping , th e mos t importan t featur e i s th e automati c creatio th e databas e structure , togethe r whit h th e possibilit y o f changin conceptua l schem a (databas e structure ) withou t dat a recharge .

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