That is the Question??? <a href="http://www.quest-pipelines.com/pipelines/plsql/tips.htm#OCTOBERC.J.Date">http://www.quest-pipelines.com/pipelines/plsql/tips.htm#OCTOBERC.J.Date</a> in ???An introduction to Database Systems??? (2004, page 885) says: ?????? object/relational systems ??? are, or should be, basically just relational systems that support the relational domain concept (i.e., types) properly ??? in other words, true relational systems, meaning in particular systems that