1?) UNION ALL SELECT 90,CONCAT(0x7176766271,0x4b4b6b526c48674a5368526b707551526a5a7062787458494e774f

Describe 1?) UNION ALL SELECT 90,CONCAT(0x7176766271,0x4b4b6b526c48674a5368526b707551526a5a7062787458494e774f here.