-9721?) UNION ALL SELECT CONCAT(0x7176766271,0x5871736e65695578716568686571434b52504f7a4a646e6e6b475

Describe -9721?) UNION ALL SELECT CONCAT(0x7176766271,0x5871736e65695578716568686571434b52504f7a4a646e6e6b475 here.