In a table with temporal support, the header represents a predicate with at least one time parameter that represents when the rest of the predicate is valid; the complete predicate is therefore a timestamped predicate. Rows represent timestamped propositions, and the row's valid time period is expressed with one of two attributes: since (for semi temporal data) or during (for fully temporal data); the latter attribute is usually represented with two values, from and to. The following table shows the original and two additional timestamped versions of an exemplary Suppliers table:
Original Suppliers table and two tables ...
