Pengfei Li@mhyq56618United StatesFollow BadgesProblem SolvingDays ofStatisticsSql CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Problem Solving (Intermediate)VerifiedskillCertificate: SQL (Basic)VerifiedskillCertificate: SQL (Intermediate)VerifiedskillWork Experiencemhyq56618 has not updated employment details yet.Educationmhyq56618 has not updated education details yet.