1?) UNION ALL SELECT NULL,CONCAT(0x7176766271,0x464b534d644d745574725055517a4e616b734d47534a6e6a7657

Describe 1?) UNION ALL SELECT NULL,CONCAT(0x7176766271,0x464b534d644d745574725055517a4e616b734d47534a6e6a7657 here.