Sequence the missing value
Hello gurus,I load the data staging table to focus and need to generate the sequence during the loading of target. With the help of kickbacks.
Table 1 CBC (intermediate table) table 2: TGT (target table)
Identity name of Sal Seq ID no name Sal
-- ---- --- --- -- ---- ---
10 'abc' 200 1 10 'abc' 200
20 'homeless' 300
30 "ghr" 400
40 "Godin" 500
My query is:
Select t.ID, t.name, t.sal, decode(t.seq,0,SEQUENCE.nextval,1,) as seq
Of
(select seq decode (tgt.seq, NULL, 0, 1), src.sal, src.name, src.ID)
the CBC
left outer join TGT
We src.id = tgt.id) t
1ST ROUND:
ID name Sal seq
--- ---- ---- ----
10 'abc' 200 NULL
20 'homeless' 1 300
30 400 2 "ghr"
40 "Godin" 500 * 3 *.
2ND ROUND:
ID name Sal seq
--- --- --- ---
10 'abc' 200 NULL
20 'homeless' 300 * 5 *.
30 "ghr" 400 6
40 "Godin" 7 500
Whenever I run the same query there is gap in the order (after 3, 4 missing is.).
Please let me know what im missing here.
or how to avoid the ditch in order.
Using Oracle 10 g Release 10.2.0.1.0
Thank you!
You can also create a small function to replace the DECODING. Subsequently, NEXTVAL is called only when the value passed in is null, so the sequence increments on another value. All SQL solutions are generally preferable, but it works.
CREATE OR REPLACE FUNCTION seq_func (p_seqval NUMBER)
RETURN NUMBER
AS
BEGIN
IF p_seqval = 0 THEN
RETURN SEQUENCE.nextval;
ELSE
RETURN NULL;
END IF;
END seq_func;
SELECT t.ID, t.name, t.sal, seq_func(t.seq) as seq
FROM (SELECT src.ID ,src.name ,src.sal, decode(tgt.seq,NULL,0,1) seq
FROM SRC
LEFT OUTER JOIN TGT
ON src.id = tgt.id
) t
Tags: Database
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