Datalog was even more refined over time, As well as in 1989, the language was standardized from the International Corporation for Standardization (ISO). The standardization gave the language a much more formal specification, which served in its wider adoption. Its origins day back again to the beginning of logic programming, https://josueuqjbr.verybigblog.com/33277732/5-tips-about-datalog-you-can-use-today