create table test
(tid number(10,0) not null primary key,
col1 varchar2(10) ,
col2 varchar2(10) ,
col3 varchar2(10) ,
col4 varchar2(10)
);insert into test values(1,'a','aa','aaa','1');
insert into test values(2,'a','aa','aaa','3');
insert into test values(3,'b','bb','bbb','4');
insert into test values(4,'b','bb','bbb','0');
insert into test values(5,'c','cc','ccc','1');
insert into test values(6,'c','cc','ccc','2');
insert into test values(7,'d','dd','ddd','0');
insert into test values(8,'a1','aa1','aaa1','3');
insert into test values(9,'a2','aa2','aaa2','2');
insert into test values(10,'a3','aa3','aaa3','1');
select * from test t
where exists(select 1 from test t2
where t.col1=t2.col1
and t.col2=t2.col2
and t.col3=t2.col3
and t.col4>t2.col4)
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