Temporal Database
description
Transcript of Temporal Database
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Chap3
Temporal Database
Chap 3: The Interval-extended Chap 3: The Interval-extended Relational Model and Its Relational Model and Its Applications to Valid-time Applications to Valid-time Databases Databases
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Chap33.2 Underlying Formalization
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Chap33.2 Underlying Formalization
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Chap33.2 Underlying Formalization
I(D): The set of all the intervals over 1-d space D
The empty set is not an interval.
Boundaries of interval: start(:di, dj)) stop(:di, dj))
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Chap33.2 Underlying Formalization
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Chap33.2 Underlying Formalization
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Chap33.2.3 N-Dimensional Intervals
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Chap33.2.3 N-Dimensional Intervals
u =:2,6) × :1,6)
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Chap33.2.4 The Duality Principle
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Chap33.3 The IXRM Model
b??
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Chap33.3 The IXRM Model
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Chap33.3 The IXRM Model
By notation of chap 2
Name Amount john
[d2, d5] ∪ [d9, d11] 10k
[d15, dnow] 12k alex [d9, d11] 14k
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Chap33.3 The IXRM Model
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Chap33.3.2 Operations
Union, Difference, Projection, Cartesian Product
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Chap33.3.2 Operations
S = Fold: Ai ! ( R )
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Chap33.3.2 Operations
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Chap33.3.2 Operations
IF S = Fold: Ai ! ( R ) , the following properties are satisfied.
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Chap33.3.2 Operations
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Chap33.3.2 Operations
3.3.2 Operations
R = Unfold: Time ! (SALARY)
SALARY = Fold: Time! (R)
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Chap33.3.2 Operations
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Chap33.3.2 Operations
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Chap33.3.2 Operations
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Chap33.3.2 Operations
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Chap3
3.3.3 Geometric Interpretation of the New Operations
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Chap3
3.3.3 Geometric Interpretation of the New Operations
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Chap3
3.3.3 Geometric Interpretation of the New Operations
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Chap3
3.3.3 Geometric Interpretation of the New Operations
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Chap3
3.3.3 Geometric Interpretation of the New Operations
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Chap33.4 Application to Valid-time Database
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Chap3
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Chap33.4.2 Deletion of Data
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Chap33.4.3 Retrieval of Data
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Chap3SALARY
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Chap3
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Chap33.4.3 Retrieval of Data
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Chap3
3.4.3 Retrieval of Data
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Chap33.4.3 Retrieval of Data
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Chap33.5 Implementation
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Chap33.5 Implementation