It looks like the last SQL is selecting fields from both files:

SELECT ODORD#, ODLINE, ODSTTS, OLSTTS
OLSTTS is from the BLORDLP File and the others (ODORD#, etc.) are from
the BLORDDP File.


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rick baird
Sent: Tuesday, March 18, 2008 3:22 PM
To: Midrange Systems Technical Discussion
Subject: sql performance question

Why would the last of the following two SQL statements run ten times
slower than the other?


SELECT *
FROM BLORDLP A
JOIN BLORDDP B
ON ODORD# = OLORD#
AND ODLINE = OLLINE
WHERE OLSTTS <> ODSTTS


SELECT ODORD#, ODLINE, ODSTTS, OLSTTS
FROM BLORDLP A
JOIN BLORDDP B
ON ODORD# = OLORD#
AND ODLINE = OLLINE
WHERE OLSTTS <> ODSTTS

The only difference being the first selects all fields and runs
immediately, the second only selects 4 fields and takes forever to
run.

thanks,

rick

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