Need to get average numbers > 0

I need to get the average of the 2 numbers POSITIVE, non-null.
I still want to keep the NULL value in the column. I want to update the table
where NVL (temp_s,-1) = 0
Here's a sample:
< code >
create the dummy (MY_ID NUMBER (5.0) of the table)
C_DATE DATE
TEMP_S NUMBER (4,0));

Insert into dummy (my_id, c_date, temp_s) values (41, to_date('20130114','YYYYMMDD'), 32);
Insert into dummy (my_id, c_date, temp_s) values (41, to_date('20130113','YYYYMMDD'), 0);
Insert into dummy (my_id, c_date, temp_s) values (41, to_date('20130112','YYYYMMDD'), 57);
Insert into dummy (my_id, c_date, temp_s) values (41, to_date('20130111','YYYYMMDD'), NULL);
Insert into dummy (my_id, c_date, temp_s) values (56, to_date('20130110','YYYYMMDD'), 59);
Insert into dummy (my_id, c_date, temp_s) values (56, to_date('20130109','YYYYMMDD'), 0);
Insert into dummy (my_id, c_date, temp_s) values (56, to_date('20130108','YYYYMMDD'), 51);
Insert into dummy (my_id, c_date, temp_s) values (56, to_date('20130107','YYYYMMDD'), NULL);

< code >
I want the output to be:
< code >
41 14 JANUARY 13 32
41 13 January 13 45 < = this update based on the day, before and after.
41 12 JANUARY 13 57
41 11 JANUARY 13 NULL
56 10 JANUARY 13 59
56 9 January 13 55 < = this update based on the day, before and after.
56 8 JANUARY 13 51
56 7 JANUARY 13 NULL
< code >
TIA
Steve42

Hello

Here's one way:

MERGE INTO     dummy     dst
USING   (
         SELECT  my_id, c_date
         ,         CASE
                     WHEN  temp_s <= 0
                 THEN  CEIL ( ( LAG  (temp_s) OVER ( PARTITION BY  my_id
                                                              ORDER BY       c_date
                                    )
                              + LEAD (temp_s) OVER ( PARTITION BY  my_id
                                                              ORDER BY       c_date
                                    )
                        )
                      / 2
                      )
                  END          AS temp_s
         FROM    dummy
     )          src
ON     (    dst.my_id     = src.my_id
     AND  dst.c_date     = srC.c_date
     )
WHEN MATCHED THEN UPDATE
SET     dst.temp_s     = src.temp_s
WHERE     dst.tEmp_s     <= 0
;

Depending on what my_id role in this problem, and what is unique, you may need to tweak it a bit.

Tags: Database

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