Predom value Calculation

Question

Hello All,
I'm in oralce 11gR2 RAC- 2 node. Trying to calulate a predominant value.
Predominance – Calculated value will be based on the most prevalent value that falls within the limits of the section
Here is a excerpt from the output to explain better
The below values are ordered by MIN_MSR,MAX_MSR.
MIN_MSR     MAX_MSR     VALUE
53.04     53.344     85
53.344     53.35     85
53.35     53.73     85
53.73     54.327     72
54.327     54.356     72
54.356     55.63     72
55.63     58.93     63
58.93     58.989     63
58.989     58.993     63
58.993     59.12     63
EXPECTED OUTPUT
MIN_MSR     MAX_MSR     PREDOM(VALUE)
53.04        59.12        63 (because 63 is more prevailant , 85 is the value for 53.73 - 53.04=0.69 miles, 72 is the value for 55.63-53.73=1.9 miles, 63 is the value for 59.12-55.63=3.49 miles)63 is more prevailant , 85 is the value for 53.73 - 53.04=0.69 miles, 72 is the value for 55.63-53.73=1.9 miles, 63 is the value for 59.12-55.63=3.49 miles
Thanks in advance
NU

Answer 1

Hi,
Here's one way:
WITH     got_rnk          AS
     SELECT       value
     ,       MIN (min_msr)          AS min_msr
     ,       MAX (max_msr)          AS max_msr
     ,       RANK () OVER ( PARTITION BY  value
                                   ORDER BY      SUM (max_msr - min_msr)  DESC
                      )        AS rnk
     FROM       table_x
     GROUP BY  value
SELECT     min_msr
,      max_msr
,      value
FROM     got_rnk
WHERE     rnk     = 1
;If you'd care to post CREATE TABLE and INSERT statements for your sample data, then I could test it.
This is an example of a Top-N Query , where you pick N items (N=1 in this case) from the top of a sorted list.