Logic needed for the following data

Question

Hi All,
I have procedure in that I am calling a cursor to fetch the records. This query is returning the following data
DI
SZ
DII
CWT
Top
down
9 1/2
9.625
8.921
36
18
1602
13 1/2
13.375
12.515
61
19
1962
18 1/2
18.625
17.755
87.5
20
503
26
26
24.75
105
20
103
9 1/2
9.625
8.835
40
1602
3858
7
7
6.276
26
1683
6352
I want to  print just these values ..
9 1/2
9.625
8.921
36
18
1602
9 1/2
9.625
8.835
40
1602
3858
7
7
6.276
26
1683
6352
As you can see in these values top and down are overlapping.
I tried several ways to sort the query on the fields and have some logic, but I am always getting one row extra which is not overlapping.
Can someone please give me the logic to get the desired result through conditions in Procedure/function/package
Thanks

Answer 1

BrendanP wrote:
26    AND t.top
"AND t.top....."... what?
Here's another solution, giving the least overlap over the greatest distance...
SQL> ed
Wrote file afiedt.buf
  1  with data as (select 1 id , 18 top, 1602 down from dual union all
  2                select 2,19, 1962 from dual union all
  3                select 3,20, 503 from dual union all
  4                select 4,20, 103 from dual union all
  5                select 5,1602, 3858 from dual union all
  6                select 6,1683, 6352 from dual
  7               )
  8  -- -------------------------------------------------------
  9  -- END OF TEST DATA JUST USE QUERY BELOW AGAINST OWN TABLE
10  -- -------------------------------------------------------
11      ,idealpath as (
12         select id, path, idpath
13         from (
14               select id, path, idpath, cmlt_diff, min_diff, cvrg, max_cvrg
15               from  (
16                      select x.id
17                           ,x.path
18                           ,idpath
19                           ,to_number(y.column_value) as cmlt_diff
20                           ,min(to_number(y.column_value)) over (partition by cvrg) as min_diff
21                           ,cvrg
22                           ,max(cvrg) over () as max_cvrg
23                     from (
24                           select connect_by_root(id) as id
25                                 ,down-connect_by_root(top) as cvrg
26                                 ,ltrim(sys_connect_by_path(prior down-top,'+'),'+') as cmlt_diff
27                                 ,ltrim(sys_connect_by_path(top||'-'||down,':'),':') as path
28                                 ,ltrim(sys_connect_by_path(id,':'),':') as idpath
29                           from   data
30                           where connect_by_isleaf = 1
31                           connect by nocycle top between prior top and prior down
32                                      and not down between prior top and prior down
33                          ) x
34                          ,xmltable(nvl(cmlt_diff,'0')) y
35                    )
36               where cvrg = max_cvrg
37              )
38         where cmlt_diff = min_diff
39        )
40  --
41  select d.id, d.top, d.down
42  from   data d
43        ,(select level l, to_number(regexp_substr(idpath,'[^:]+',1,level)) as id
44          from   idealpath
45          connect by regexp_substr(idpath,'[^:]+',1,level) is not null) bp
46  where  bp.id = d.id
47* order by bp.l
SQL> /
        ID        TOP       DOWN
         1         18       1602
         2         19       1962
         6       1683       6352