예전에 검색한 자료입니다. 참고하세요~
https://www.doag.org/formes/pubfiles/11232286/2019-SQL-Robert_Pastijn-Datenbank_19c_neue_Funktionalitaeten_und_Roadmap-Praesentation.pdf
http://nocoug.org/download/2019-02/NoCOUG_201902_Kim_18c_New_Features.pdf
https://cdn.ymaws.com/ukoug.org/resource/resmgr/scotland_19/Maria_Colgan_2.pdf