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Chris Date is famous for his writings on relational theory. At IBM in the seventies, and afterwards, he was a friend and colleague of Edgar Codd, who invented the principles of the relational database. Chris took on the role of communicating and teaching Codd's relational theory, and reluctantly admits to a role in establishing SQL as the dominant relational language. Richard Morris interviews the well-known author and computer scientist

This paper aims to examine the asymmetric impact of oil price shocks on environmental degradation for a panel of six Gulf Cooperation Council (GCC) countries from 1996 to 2016. We use dynamic seemingly unrelated regressions (DSUR) approach that considers cross-sectional dependency to reveal the interrelations between oil price shocks and carbon dioxide (CO2) emissions. The finding shows that the positive shocks of oil prices have a statistically significant negative effect on CO2 emissions, while negative shocks of oil prices did not affect CO2 emissions. More specifically, the positive oil pr...

With a Low-cost Single-frequency Multi-GNSS Receiver Although precise point positioning (PPP) has been largely limited to applications in open environments u