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AW: SQL UNION and ORDER BY



fixed

Beginning with Release 6.1 it is possible to include ORDER BYs into the
Sub-Selects. But IMHO it does not guarantee that final result is returned in
this sequence.
In this way you may add additional sort columns into the sub-selects and add
a final Order by based on this sort keys.

Example:

Select a.*, 1 SortFile, Row_Number() Over(Order By Key1, Key2, ... KeyN)
SortKey
From YourTable1 a
...
Union
Select b.*, 2 , RRN(b),
From YourTable2 b
....
Select c.*, 3, RRN(C)
From YourTable3 c
....
Order By SortFile, SortKey

Mit freundlichen Grüßen / Best regards

Birgitta Hauser

"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them
and keeping them!"

-----Ursprüngliche Nachricht-----
Von: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von Stone, Joel
Gesendet: Thursday, 13.2 2014 23:25
An: midrange-l@xxxxxxxxxxxx
Betreff: SQL UNION and ORDER BY

I would like to have a

SELECT with an ORDER BY

And UNION this to another SELECT without an order by.

Is this possible?

It seems that SQL requires the ORDER BY to sort the entire result file.

Thanks



select fieldnames
FROM fileA

ORDER BY field1, field2



UNION all

SELECT
More field names
FROM from

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