RE: SQL Like vs. = sign

[ron_adams@xxxxxxxxxxxxxx]

You could always run a test and check the results.

Just do CHGQRYA QRYTIMLMT(0)  before you run your SQL and it will force 
the Query Engine to analyze the access paths that will be used and return 
"debuggin/timing" info.

Ron Adams
Information Technology Group
Crane Valves
9200 New Trails Dr. Suite 200
The Woodlands, TX 77385





rob@xxxxxxxxx
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I wondered about that.  But I also thought it was only if you had a 
percent sign in the front.  I supposed a couple of sql's under debug 
should show you that.

Rob Berendt
-- 
Group Dekko Services, LLC
Dept 01.073
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Kendallville, IN 46755
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"Erich W. Schasse" <Schasse@xxxxxxxxxxxx> 
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RE: SQL Like vs. = sign






Hi Dan,

yes, there is a huge performance difference.

With LIKE the optimizer can't use any index, ==> sequential search.


Mit freundlichen Grüßen / Kind regards

i.A. Erich W. Schasse

WIEDEMANN GmbH & Co. KG
IT/ORG
Wiedemannstr.
31157 Sarstedt
Tel. 05066/997-190
Fax  05066/997-366
mailto:schasse@xxxxxxxxxxxx
www.wiedemann.de



-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx]On Behalf Of Dan Bale
Sent: Tuesday, October 05, 2004 4:46 PM
To: midrange-l@xxxxxxxxxxxx
Subject: SQL Like vs. = sign


I am setting up a dynamic SQL statement based on user input for data
selection.  They are able to select using wildcards, so I am using the 
LIKE
predicate to handle this.

My question is this:  When the user doesn't specify wildcards, and 
specifies
a "straight" value, is there any difference between using LIKE and an 
equal
sign?  I.e.:

CUSTNAME LIKE 'BALE, DAN'
CUSTNAME = 'BALE, DAN'

tia,
db

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