#IT #SQL #PostgreSQL #Datawarehouse #Datavault #Historisation

Management of Temporal Data

The main purpose of this website is to present SQL code.
For theoretical background refer to:
“Managing Time in Relational Databases” by Tom Johnston & Randall Weis
or Wikipedia: https://en.wikipedia.org/wiki/Temporal_database

IT SQL PostgreSQL Datawarehouse Datavault Historisation

From Point in Time to Time Interval

To warm up – unitemporal: Unitemporal Data
Main point – bitemporal: Generate Bitemporal Intervals

Merge Time Slices

Merging adjacent time slices: Time Slice Compressor
Merging in bitemporal case: Time Slice Compressor

Join Temporal Tables

Join unitemporal Tables: Table Join
Join multi-temporal Tables: Multi-temporal Table Join

Overlap Free Time Slices

Overlap Free unitemporal: Overlap Free

Completeness of Time Slices

Gaplessness unitemporal: Gaplessness

Remarks

Comments on overlaps: Overlaps

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