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- Incomplete and Probabilistic Databases
+ Incomplete and Probabilistic Databases
+ We've gotten good at query processing on uncertain data. A small shift in how we think about PDBs addresses all three points.The database is in the way
+ Why?
On representing incomplete information in a relational data base
- T. Imielinski & W. Lipski Jr.(VLDB 1981)
-
have existed since the 1980s
- On representing incomplete information in a relational data base
+ T. Imielinski & W. Lipski Jr.(VLDB 1981)
+
have existed since the 1980s
+
+ But not at "sourcing" uncertain data
+ ... or communicating results.
+ Challenges
+
+
+
Insight: Treat data as 100% deterministic.
+Instead, queries propose alternative interpretations.
+ -Time | Sensor Reading | Temp Around Sensor | -
---|---|---|
1 | 31.6 | Roughly 31.6˚C |
2 | -999 | Around 30˚C? |
4 | 28.1 | Roughly 28.1˚C? |
3 | 32.2 | Roughly 32.2˚C |
The reading is deterministic
-... but what we care about is what the reading measures
-Insight 1: Treat data as 100% deterministic.
Instead, queries propose alternative interpretations.
+ Introduce Best-Guess queries and the idea of explanations. Key points: +
+ Optimizing sampling-based query evaluation +
+