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On 09-Mar-2012 05:31 , Michael Schutte wrote:
I believe that the order by inside a CTE is ignored.
i.e. with this query, it's still in RRN order.
WITH cte as (
SELECT rrn(build) rrn, build.*
FROM build
ORDER BY BUNAME)
SELECT *
FROM cte
Likely a query /rewrite/ would be found to have eliminated the CTE
for that query request, versus merely having eliminated\ignored the
ORDER BY in the CTE. The query implementation likely would have
generated no [un]ordered temporary result, regardless of the request to
do so. The optimizer would find little value in implementing the
ordering of that temporary result, nor even the creation of that
temporary result, in order to plan the means to access the data for the
outer-most SELECT [which requests neither any specific collation\ORDER
nor any selection\WHERE which might benefit from having implemented with
an ordered temporary result].
Regards, Chuck
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