Just FYI: The SQL standard supports both types. The other one (valid time) is called "application versioning" in SQL. Read this paper if you'd like to learn mo

Just FYI: The SQL standard supports both types. The other one (valid time) is called "application versioning" in SQL. Read this paper if you'd like to learn more about it: http://cs.ulb.ac.be/public/_media/teaching/infoh415/tempfeaturessql2011.pdf http://cs.ulb.ac.be/public/_media/teaching/infoh415/tempfeat...