sql to create value based on prior record

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sql to create value based on prior record

Author

Topic

NTC
Starting Member

21 Posts

Posted - 2008-04-07 : 22:36:01

Is Access/Jet
Table is this:
id, wo,
1, 2345-1
2, 2345-1
3, 2345-1
4, 5432-1
5, 5432-1
6, 5432-1

Need result:

id, wo, parent
1, 2345-1, 1
2, 2345-1, 1
3, 2345-1, 2
4, 5432-1, 4
5, 5432-1, 4
6, 5432-1, 5

the logic is If wo = wo of ID-1 then Parent = Id-1
If wo not= wo of ID-1 then Parent = Id

could use help on the correct sql statement for this...
thanks in advance...

jhocutt
Constraint Violating Yak Guru

385 Posts

Posted - 2008-04-07 : 23:04:37

[code]
SELECT
t.id,
t.wo,
IIF(isnull(t2.id), t.id, IIF(t.wo = t2.wo, t2.id, t.id) ) as parent
FROM t left join t t2 ON t.id-1=t2.id;

[/code]

"God does not play dice" -- Albert Einstein
"Not only does God play dice, but he sometimes throws them where they cannot be seen."
-- Stephen Hawking

NTC
Starting Member

21 Posts

Posted - 2008-04-08 : 15:02:34

Much Thanks - works like a champ.. !!

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