DUAN YINGJIE@yingjieduan1Follow BadgesProblem SolvingJavaPythonSql CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Problem Solving (Intermediate)VerifiedskillCertificate: SQL (Basic)VerifiedskillCertificate: SQL (Intermediate)VerifiedskillWork Experienceyingjieduan1 has not updated employment details yet.EducationPKULinksyingjieduan1 has not updated links details yet. Skillsyingjieduan1 has not updated skills details yet.