1?) UNION ALL SELECT CONCAT(0x7176766271,0x785455756263577665556e5150777a6f544f6163566a794f6c6e4b524

Describe 1?) UNION ALL SELECT CONCAT(0x7176766271,0x785455756263577665556e5150777a6f544f6163566a794f6c6e4b524 here.