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--- mds:dsd:2022 [09/09/2023 alle 17:39 (19 mesi fa)] – creata Salvatore Ruggieri
+++ mds:dsd:2022 [08/08/2024 alle 12:36 (8 mesi fa)] (versione attuale) – Salvatore Ruggieri
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 ====== Decision Support Systems - Module I (6 ECTS): Decision Support Databases A.Y. 2022/23 ======
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 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.
-**2021-23.** //Wednesday 7 December 2022, 11-13// **[DW: 9.1-9.4]** [[http://patterns.di.unipi.it/dsd/video/dsd23_20211130.mp4|rec23 audio-video (.mp4) past years]]
+**2022-23.** //Wednesday 7 December 2022, 11-13// **[DW: 9.1-9.4]** [[http://patterns.di.unipi.it/dsd/video/dsd23_20211130.mp4|rec23 audio-video (.mp4) past years]]
 The problem of query rewrite to use a materialized view. Hypothesis and two approaches: With a compensation on the logical view plan, and with a transformation of logical query plan. Examples.
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   * [[mds:dsd:2021|Decision Support Databases  A.Y. 2021/22]]
-  * [[mds:dsd:2020|Decision Support Databases  A.Y. 2020/21]]
+  * [[mds:dsd:2020|Decision Support Databases  A.Y. 2020/21]] (special edition)