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asterix07
.precettore.

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 Info es. esame

Quando viene richiesto di "...esprimere in Algebra relazionale OTTIMIZZATA..." cosa si intende per ottimizzata??
Grazie
07-01-2009 10:14
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number15
.grande:maestro.

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Nel senso che c'è un ordine in cui è meglio fare le operazioni: ad esempio la selezione è l'operazione che va fatta sempre per prima, poi proiezione ecc

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07-01-2009 13:02
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