Re: SQL - find 'missing' numbers

Chuck,

Can't say I've tested it on IBM i...

But this guy tested it on MS SQL Server..
http://thehobt.blogspot.com/2009/04/enumerating-date-intervals-in-sql.html

My Number table has a PK, so no worries about duplicates.

I'll see about running some benchmarks at some point..

Charles

On Tue, Sep 29, 2015 at 1:35 PM, CRPence <crpbottle@xxxxxxxxx> wrote:

On 29-Sep-2015 10:58 -0600, Charles Wilt wrote:

<<SNIP>> there is (probably) still a performance benefit to having
the numbers table pre-generated instead of generating it on the fly
for every request. <<SNIP>>

The dynamically produced table as RCTE is a true-temporary
temporary-object and may easily outperform a reference to a pre-existing
TABLE of numbers, esp. if the data must be faulted. And nobody can
delete-from, insert-into, or update the data in the dynamic TABLE like they
potentially could with a permanent database file; perhaps onto which some
additional protections [e.g. triggers, ALWUPD(*NO) ALWDLT(*NO), etc.?]
should be placed, to prevent possible unexpected results.?

--
Regards, Chuck


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