Yifan Cheng@chengy1Data AnalystFollow BadgesProblem SolvingSql Certificationschengy1 has not earned any certificates yet. Work Experiencechengy1 has not updated employment details yet.Educationchengy1 has not updated education details yet.LinksLinkedinhttp://www.linkedin.com/in/yifan-cheng Skillschengy1 has not updated skills details yet.