Huaying Li@hl3101Operations Research Student from Columbia UniversityUnited StatesFollow BadgesProblem SolvingSql CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: SQL (Basic)VerifiedskillCertificate: SQL (Intermediate)VerifiedskillWork Experiencehl3101 has not updated employment details yet.Educationhl3101 has not updated education details yet.