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  3. June 2013

Re: Create view using CTE as to have an ORDER BY

On 05 Jun 2013 09:29, Dan Kimmel wrote:
<<SNIP>> Most database engines will produce a result set ordered by
primary key if there is no ORDER BY in the SELECT. They don't have
to. It just happens to be the most optimal way of producing the list.
<<SNIP>>

FWiW: The optimal access method for the DB2 for i is the /sequential/ access, using the /arrival/ access path, except when the query can be implemented using /index only/ access method [which is AFaIK, a method available only to the query engines]. Often, but not predictably, the result set of an unordered query will reflect /arrival access path/ of the table-reference.


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