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| current database ： ウィキペディア英語版 |
current database
A current database is a conventional database that stores data that is valid now. For example, if a user inserts "John Smith" into the Staff table of a current database, this asserts that the fact is valid ''now'' and until it is subsequently deleted.
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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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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