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Note that apart from the -superscripts, which are added to relational algebra operators, the translation between SQL queries and relational algebra…

Note that apart from the -superscripts, which are added to relational algebra operators, the translation between SQL queries and relational algebra expressions has not changed at all. T u The de nitions above satisfy sequenced semantics if the temporal relational operators are sequenced with respect to their conventional relational counterparts. The next step is to de ne a temporal relational algebra with this property. DBL:?

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