oleg ggringof@gringof_15Russian FederationFollow BadgesJavaPythonSql CertificationsCertificate: SQL (Basic)VerifiedskillCertificate: SQL (Intermediate)VerifiedskillCertificate: SQL (Advanced)VerifiedskillWork Experiencegringof_15 has not updated employment details yet.Educationgringof_15 has not updated education details yet.