Question

l have the following table and data and expected output with my rules

drop table test_new

create table test_new (id number(9), loc1 number(9), loc2 number(9), percentage number(9));

insert into test_new values (1,1,2,0);
insert into test_new values(2,1,3,10);
insert into test_new values(3,1,4,5);
insert into test_new values(4,1,5,45);
insert into test_new values(5,2,3,0);
insert into test_new values(6,2,4,90);
insert into test_new values(7,2,5,0);
insert into test_new values(8,3,4,0);
insert into test_new values(9,3,5,0);
insert into test_new values(10,4,5,40);
insert into test_new values(11,7,5,0);
insert into test_new values(12,9,4,0);
insert into test_new values(13,10,5,90);
insert into test_new values(14,11,5,70);
insert into test_new values(15,1,15,45);

in need this form The query show that

id  loc1 loc2  percentage
15    1    15       45
2    1    3       10
6    2    4       90
13   10   5       90

Not this one

id   loc1 loc2  percentage
2    1    3       10
15    1    15      45
6    2    4       90
13   10   5       90

Rules:

1. show id, loc1, loc2, percentage where percentage greater than zero.
2. remove any redundance of data in column loc2 so the remove row that has lower value of percentage.
3. sort data based on percentage asc and group it based column loc1.

Answer 1

Give this a try.

select t1.* from test_new t1
left join test_new t2
on t1.loc2 = t2.loc2 and t1.percentage < t2.percentage
where t1.percentage > 0 and t2.loc2 is null
order by t1.percentage

However, I think that based on your comments (not on your result table, which seems to be wrong), this is what you’re expecting:

+----+------+------+------------+
| ID | LOC1 | LOC2 | PERCENTAGE |
+----+------+------+------------+
|  2 |    1 |    3 |         10 |
| 15 |    1 |   15 |         45 |
|  6 |    2 |    4 |         90 |
| 13 |   10 |    5 |         90 |
+----+------+------+------------+