[dsp1234]

Delta queries can be serviced by any system that supports temporal tables[0][1], or another mechanism where data changes are tracked.

[0] - https://en.wikipedia.org/wiki/SQL:2011 (temporal support)

[1] - https://msdn.microsoft.com/en-us/library/dn935015.aspx

[2] - http://clarkdave.net/2015/02/historical-records-with-postgre...