Strumenti Utente

Strumenti Sito


mds:dsd:start

Differenze

Queste sono le differenze tra la revisione selezionata e la versione attuale della pagina.

Link a questa pagina di confronto

Entrambe le parti precedenti la revisione Revisione precedente
mds:dsd:start [24/11/2021 alle 12:56 (4 giorni fa)]
Salvatore Ruggieri [Exams]
mds:dsd:start [26/11/2021 alle 16:55 (34 ore fa)] (versione attuale)
Salvatore Ruggieri [Class calendar]
Linea 212: Linea 212:
 Recalls of functional dependency properties and how they are used to reason about the properties of the result of a query. Properties of the group-by operator. Recalls of functional dependency properties and how they are used to reason about the properties of the result of a query. Properties of the group-by operator.
  
-**2021-22.** //Friday 26 November 2021, 16-18// **[DW: 8.3-8.6]** +**2021-22.** //Friday 26 November 2021, 16-18// **[DW: 8.3-8.6]** [[http://patterns.di.unipi.it/bsd/video/dsd22_20211126.mp4|rec22 audio-video (.mp4)]]
  
 The problem of evaluating the group-by before the join operator. First case: Invariant grouping. Examples. Other cases: double grouping, grouping and counting. Examples with star queries. The problem of evaluating the group-by before the join operator. First case: Invariant grouping. Examples. Other cases: double grouping, grouping and counting. Examples with star queries.
mds/dsd/start.txt · Ultima modifica: 26/11/2021 alle 16:55 (34 ore fa) da Salvatore Ruggieri