RE: SQL question from an absolute SQL newbie

You really don't want to do it that way. You're doing a date conversion once for every post_date row in the table. Instead convert current_date - 1 days to the CCYYMMDD numeric format which would be only done once for the whole statement by the SQL optimizer. N row conversions to date is slower than one conversion to CCYYMMDD numeric.

Paul Morgan

Principal Programmer Analyst
IT Supply Chain/Replenishment


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Schutte, Michael D
Sent: Wednesday, August 31, 2011 8:06 AM
To: Midrange Systems Technical Discussion
Subject: RE: SQL question from an absolute SQL newbie

Instead of using iDate, use Date.

Where Date(digits(post_date) concat '000000') = current_date - 1 days


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Tom Hightower
Sent: Tuesday, August 30, 2011 7:34 PM
To: Midrange Systems Technical Discussion
Subject: SQL question from an absolute SQL newbie

Once again I come to the masters of all things SQL...

I have 2 files:

File TCKTHIST:
TICKET#
CUSTOMER#
TRAN_DATE (CCYYMMDD, likely not the same value as POST_DATE) POST_DATE (CCYYMMDD)


File NEWTCKTS:
TICKET#
CUSTOMER#
TRAN_DATE (CCYYMMDD)

I need to work up an SQL statement that will find all entries in TCKTHIST with a post_date = yesterday and which are not in file NEWTCKTS. Fields TICKET#, CUSTOMER# and TRAN_DATE are common fields to both files; POST_DATE is only in TCKTHIST.





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