A temporal join is a join operation on two temporal relations, in which each tuple has additional attributes indicating a time interval. The temporal join predicates include conventional join predicates as well as a temporal constraint that requires the overlap of the intervals of the two joined tuples. The result of a temporal join is a temporal relation.
Besides binary temporal joins that operate on two temporal relations, there are n-ary temporal joins that operate on more than two temporal relations. Besides temporal overlapping, there are other temporal conditions such as “before” and “after” . This entry will concentrate on the binary temporal joins with overlapping temporal condition since most of the previous work has focused on this kind of joins.
In the past, temporal join operators have been defined in different temporal data models; at times the essentially same operators have even been given different names when defined in different data...
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