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FWiW: Creating a permanent sequence object and an effective temporary file [it too is a permanent object, with all the associated overhead of ownership and authority] is a large amount of work for the OS. Compare to a CTE which is an actual /temporary/ object which is generated only within the scope of the single SQL statement, and automatically deleted when the SELECT cursor is closed.

Regards, Chuck

David FOXWELL wrote:
I have done this with an SQL sequence.

Create a temporary file from the sequence and run your
file <ed: SELECT> against this temporary file.


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