1?) UNION ALL SELECT 90,90,90,CONCAT(0x7176766271,0x746b65527761766b4c66536161586b465963646c7a6b4879

Describe 1?) UNION ALL SELECT 90,90,90,CONCAT(0x7176766271,0x746b65527761766b4c66536161586b465963646c7a6b4879 here.