Harry Karanikas successfully completed the online non-credit course "SQL for Data Science" authorized by University of California, Davis and offered through Coursera. The course certificate was issued on December 12, 2020 and was signed by the instructor Sadie St. Lawrence, who is an AI Strategy Consultant, founder of Women in Data, and instructor at University of California, Davis Extension. Coursera verified Harry Karanikas' identity and participation in the course.