Relative Maximum

Hello

I want to find the 'maximum Relative' in a list of values by using a select statement.

"What is the relative Maximum?

This is the highest value in a series, before starting to decline.

Look at these three examples:

(A) 5 4 3 6 8 9 7 10 11 it is 9, because as the numbers start to increase, the following value is less than 9.

(B) 5 6 7 8 3 4 is 7, because the next value is less than 7.

Let's create a table with 2 columns: NN and VALUE:

CREATE table TEST (NN number, VALUE);

Complete with a set of values, for example the A) series:

INSERT into TEST (1.5);

INSERT into TEST (2,4);

INSERT into TEST (3.3);

INSERT into TEST (4.6);

INSERT into TEST (5.8);

INSERT into TEST (6.9);

INSERT into TEST (7.7);

INSERT into TEST (8,10).

INSERT into TEST (9, 11);

Question... How do I retrieve the relative Maximum values ordered by NN, this is the 6th line with the value 9?

Thank you

Hello

user3292382 wrote:

Hello

I want to find the 'maximum Relative' in a list of values by using a select statement.

"What is the relative Maximum?

This is the highest value in a series, before starting to decline.

Look at these three examples:

(A) 5 4 3 6 8 9 7 10 11 it is 9, because as the numbers start to increase, the following value is less than 9.

Why are they not also related maxima 5 and 11? Is it because the very first number or the last in the list cannot be a relative maximum?

(B) 5 6 7 8 3 4 is 7, because the next value is less than 7.

(C) 5 4 3 2 1 it is 5, because there is none greater than 5 values, the number decreased to only.

If 5, at the beginning, is relative to the maximum here, so why not in the example has) also?

Let's create a table with 2 columns: NN and VALUE:

CREATE table TEST (NN number, VALUE);

Complete with a set of values, for example the A) series:

INSERT into TEST (1.5);

INSERT into TEST (2,4);

INSERT into TEST (3.3);

INSERT into TEST (4.6);

INSERT into TEST (5.8);

INSERT into TEST (6.9);

INSERT into TEST (7.7);

INSERT into TEST (8,10).

INSERT into TEST (9, 11);

Question... How do I retrieve the relative Maximum values ordered by NN, this is the 6th line with the value 9?

Thank you

Thanks for posting the sample data. You must test these statements before posting. All insertions fail because they lack you the keyword VALUES.

Don't forget to post your version of Oracle, too. From 12.1, there is a new way to do this. LEAD and LAG, as shown below, will work in Oracle 8.1 or more.

SELECT nn, value

CASE

WHAT value > LAG (value) OVER (ORDER BY nn)

AND value > LEAD (value) OVER (ORDER BY nn)

THEN 'RELATIVE MAXIMUM.

END as rm

OF the test

ORDER BY nn

;

This will display all the lines marking the relative maxima, like this:

NN VALUE RM

--------------- --------------- ----------------

1               5

2               4

3               3

4               6

5               8

6 9 MAXIMUM RELATIVE

7               7

8              10

9              11

If you want to view only the relative maxima, then you can do the same thing in a subquery and then, in a super-requete, use a WHERE clause as

WHERE rm IS NOT NULL

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