replace NULL values for not null values prior

Hi all

I want to set to Null to override value not zero preious available. data are sorted by column Date DT
WITH 
TEMP AS (SELECT SYSDATE DT, 1005 ID1, NULL ID2 FROM DUAL    
UNION ALL
SELECT SYSDATE+1 DT, 1005    , NULL ID2 FROM DUAL
UNION ALL
SELECT SYSDATE+2 DT, 1006,    1005 ID2 FROM DUAL
UNION ALL
SELECT SYSDATE+3 DT, 1006    , NULL ID2 FROM DUAL
UNION ALL
SELECT SYSDATE+4 DT, 1007,    1006 ID2 FROM DUAL
UNION ALL
SELECT SYSDATE+5 DT, 1007    , NULL ID2 FROM DUAL
UNION ALL
SELECT SYSDATE+6 DT, 1007    , NULL ID2 FROM DUAL
UNION ALL
SELECT SYSDATE+7 DT, 1006,    1007 ID2 FROM DUAL
)
SELECT * FROM TEMP
I want the output voltage:
DT                     ID1      ID2     
1/6/2012 9:54:11 AM    1005    NULL
1/7/2012 9:54:11 AM    1005    NULL
1/8/2012 9:54:11 AM    1006    1005
1/9/2012 9:54:11 AM    1006    1005
1/10/2012 9:54:11 AM    1007    1006
1/11/2012 9:54:11 AM    1007    1006
1/12/2012 9:54:11 AM    1007    1006
1/13/2012 9:54:11 AM    1006    1007
time added so far can be ignored.

Thanks in advance.

... Vivek
WITH temp AS (
SELECT SYSDATE DT, 1005 ID1, NULL ID2 FROM DUAL UNION ALL
SELECT SYSDATE+1 DT, 1005    , NULL ID2 FROM DUAL UNION ALL
SELECT SYSDATE+2 DT, 1006,    1005 ID2 FROM DUAL UNION ALL
SELECT SYSDATE+3 DT, 1006    , NULL ID2 FROM DUAL UNION ALL
SELECT SYSDATE+4 DT, 1007,    1006 ID2 FROM DUAL UNION ALL
SELECT SYSDATE+5 DT, 1007    , NULL ID2 FROM DUAL UNION ALL
SELECT SYSDATE+6 DT, 1007    , NULL ID2 FROM DUAL UNION ALL
SELECT SYSDATE+7 DT, 1006,    1007 ID2 FROM DUAL
)
SELECT dt, id1, last_value(id2 ignore nulls) over(order by dt) as id2
FROM temp
ORDER BY dt
;

Tags: Database

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