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Joe,

It's funky because reading the SQL statement requires a 'translation' from the exception join to the requirement of 'not in file'. I prefer not exists as a more straightforward (easier to understand) implementation of the requirement.

Paul Morgan

Principal Programmer Analyst
IT Supply Chain/Replenishment

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Joe Pluta
Sent: Wednesday, August 31, 2011 7:57 AM
To: Midrange Systems Technical Discussion
Subject: Re: SQL question from an absolute SQL newbie

On 8/31/2011 3:08 AM, Morgan, Paul wrote:
Select *
from TCKTHIST a
where a.POST_DATE = dec( replace( char( current_date - 1 day, iso ), '-' , '' ), 8 ) // stolen from chuck's answer
and not exists( Select *
from NEWTCKTS b
where a.TICKET# = b.TICKET#
and a.CUSTOMER# = b.CUSTOMER#
and a.TRAN_DATE = b.TRAN_DATE )

You could do a funky join between TCKTHIST and NEWTCKTS instead of the exists( test if performance is a problem.

What's funky about an exception join? Especially since the fields have
the same name, so you can use the USING clause (although the USING
clause has other side effects you should be aware of).

Joe

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