Valid time

Known as: Valid-time 
In temporal databases, valid time (VT) is the time period during which a database fact is valid in the modeled reality. As of December 2011, ISO/IEC… (More)
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Topic mentions per year

Topic mentions per year

1984-2016
05101519842016

Papers overview

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2012
2012
A temporal database schema models objects or concepts with time-related or time-variant properties and a derived database… (More)
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2002
2002
In this paper we extend the XPath data model and query language to include valid time. XPath is a language for specifying… (More)
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Highly Cited
1998
Highly Cited
1998
In <italic>valid-time indeterminacy</italic> it is known that an event stored in a database did in fact occur, but it is not… (More)
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1998
1998
To support temporal operators and to increase the efficiency of temporal queries, indexing based on temporal attributes is… (More)
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Highly Cited
1996
Highly Cited
1996
This change proposal specifies the addition of tables with valid-time support into SQL/Temporal, and explains how to use these… (More)
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Highly Cited
1994
Highly Cited
1994
Joins are arguably the most important relational operators. Poor implementations are tantamount to computing the Cartesian… (More)
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1994
1994
  • Michael H Bb Ohlen
  • 1994
This paper investigates temporal integrity constraints in valid time databases, i.e. databases that capture the time-varying… (More)
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1994
1994
We propose new temporal dependencies for valid-time relations. The proposed dependencies can be thought of as generalizations of… (More)
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Review
1993
Review
1993
I n valid-time indeterminacy, it is known that an event stored in a temporal database did in fact occur, but it is not known… (More)
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Review
1993
Review
1993
In valid-time indeterminacy, it is known that an event stored in a temporal database did in fact occur, but it is not known… (More)
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