need to recover the previous registration with the current record
Hi allI have a table like,
ID, name, date_de_modification, prev_loc
1, 'ABC', March 23, 2009, "A1".
2, "XYZ", March 23, 2009, "C1".
3, "KLM", March 23, 2009, "C1".
4, '012', March 23, 2009, "C1".
5, '1231', March 23, 2009, "C1".
6, "XYZ", March 23, 2009, "C1".
7, '435', March 23, 2009, "C1".
8, "homeless", March 28, 2009, "C1".
9, 'Bad', March 27, 2009, "C1".
10, 'ABC', March 29, 2009, "B1".
11, "345df", March 29, 2009, "C1".
12, 'ABC', March 29, 2009, "C1".
Requirement:
for 'ABC', there is 3 files. at the top is id 12. with this record I want view prev 'ABC' with id 10 folder, then
record with id 10 I want to display folder prev 'ABC' with the id 1 as wise...
I want o/p as:
12, 'ABC', MARCH 29, 2009, C1, B1
10, 'ABC', MARCH 29, 2009, B1, A1
1, 'ABC', March 29, 2009, A1, null
Kind regards
Krishna Prasad
Published by: user9933144 on April 29, 2009 02:11
Hello, something like:
WITH tab AS (
SELECT 1 ID, 'ABC' name , TO_DATE('23-March-2009', 'DD-MON-YYYY') date_modified, 'A1' prev_loc FROM DUAL UNION ALL
SELECT 2, 'XYZ' , TO_DATE('23-March-2009', 'DD-MON-YYYY'), 'C1' FROM DUAL UNION ALL
SELECT 3, 'KLM' , TO_DATE('23-March-2009', 'DD-MON-YYYY'), 'C1' FROM DUAL UNION ALL
SELECT 4, '012' , TO_DATE('23-March-2009', 'DD-MON-YYYY'), 'C1' FROM DUAL UNION ALL
SELECT 5, '1231' , TO_DATE('23-March-2009', 'DD-MON-YYYY'), 'C1' FROM DUAL UNION ALL
SELECT 6, 'XYZ' , TO_DATE('23-March-2009', 'DD-MON-YYYY'), 'C1' FROM DUAL UNION ALL
SELECT 7, '435' , TO_DATE('23-March-2009', 'DD-MON-YYYY'), 'C1' FROM DUAL UNION ALL
SELECT 8, 'sdf' , TO_DATE('28-March-2009', 'DD-MON-YYYY'), 'C1' FROM DUAL UNION ALL
SELECT 9, 'gdfg' , TO_DATE('27-March-2009', 'DD-MON-YYYY'), 'C1' FROM DUAL UNION ALL
SELECT 10, 'ABC' , TO_DATE('29-March-2009', 'DD-MON-YYYY'), 'B1' FROM DUAL UNION ALL
SELECT 11, '345df',TO_DATE('29-March-2009', 'DD-MON-YYYY'), 'C1' FROM DUAL UNION ALL
SELECT 12, 'ABC' , TO_DATE('29-March-2009', 'DD-MON-YYYY'), 'C1' FROM DUAL)
-- End of test data
SELECT Id, name, date_modified, prev_loc,
LAG(prev_loc) OVER (PARTITION BY name ORDER BY id) prev_prev_loc
FROM tab;
ID NAME DATE_MODI PR PR
--------- ----- --------- -- --
4 012 23-MAR-09 C1
5 1231 23-MAR-09 C1
11 345df 29-MAR-09 C1
7 435 23-MAR-09 C1
1 ABC 23-MAR-09 A1
10 ABC 29-MAR-09 B1 A1
12 ABC 29-MAR-09 C1 B1
3 KLM 23-MAR-09 C1
2 XYZ 23-MAR-09 C1
6 XYZ 23-MAR-09 C1 C1
9 gdfg 27-MAR-09 C1
8 sdf 28-MAR-09 C1
Published by: Seanmacgc on April 29, 2009 02:36
Tags: Database
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