Editing Temporal database (section)

==Types==
===Uni-temporal===
A uni-temporal database has one axis of time, either the validity range or the system time range.

===Bi-temporal===
{{main|Bitemporal modeling}}
A bi-temporal database has two axes of time:
* Valid time
* Transaction time or decision time

===Tri-temporal===
{{see|Decision time}}

A tri-temporal database has three axes of time:
* Valid time
* Transaction time 
* Decision time

This approach introduces additional complexities.

Temporal databases are in contrast to [[current database]]s (not to be confused with currently available databases), which store only facts which are believed to be true at the current time.