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By contrast, a Temporal Database qualifies each row with a valid time ''stamp'', valid time ''period'' or valid time ''interval''. For example, we can assert the fact that "John Smith" was a member of staff during the period 1 June 2001 and ''now''. Current databases are the most common type of database in use today. The concept of ''now'' is discussed in Clifford et alia (1997). EXTERNAL LINKS
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