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How come this random query doesn't work?

Posted on 2003-11-06
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Last Modified: 2013-12-24
<CFQUERY name="q_GetImages" datasource="Rating">
  SELECT TOP 1 *
  FROM ImageIndex II
  WHERE II.Approved = 1 AND NOT EXISTS (SELECT 1 FROM RatingsTable RT WHERE RT.ImageId = II.ImageId)
  ORDER BY rnd([ImageID])
 </CFQUERY>

For some reason this isn't returning random records, why not?
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Question by:Max_Davis
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8 Comments
 
LVL 14

Expert Comment

by:Renante Entera
ID: 9698656
Is this line correct ?  
   WHERE II.Approved = 1 AND NOT EXISTS (SELECT 1 FROM RatingsTable RT WHERE RT.ImageId = II.ImageId)

If not change it with this one, if this is what you are referring :
   WHERE II.Approved = 1 AND NOT EXISTS (SELECT TOP 1 FROM RatingsTable RT WHERE RT.ImageId = II.ImageId)

Goodluck!
eNTRANCE2002 :-)
0
 
LVL 14

Expert Comment

by:Renante Entera
ID: 9698666
Ooops! Sorry, I forgot something.

It should be this way :

WHERE II.Approved = 1 AND NOT EXISTS (SELECT TOP 1 * FROM RatingsTable RT WHERE RT.ImageId = II.ImageId)

Regards!
eNTRANCE2002 :-)
0
 
LVL 14

Expert Comment

by:Renante Entera
ID: 9698701
Try this query:

<CFQUERY name="q_GetImages" datasource="Rating">
  SELECT TOP 1 *
  FROM ImageIndex II
  WHERE II.Approved = 1
  AND NOT EXISTS (SELECT TOP 1 * FROM RatingsTable RT WHERE RT.ImageId = II.ImageId)
  ORDER BY rnd([RT.ImageID])
</CFQUERY>

Perhaps this will return any records.
0
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LVL 17

Expert Comment

by:anandkp
ID: 9698957
<CFQUERY name="q_GetImages" datasource="Rating">
  SELECT TOP 1 *
  FROM ImageIndex II
  WHERE II.Approved = 1 AND NOT EXISTS (SELECT * FROM RatingsTable RT WHERE RT.ImageId = II.ImageId)
  ORDER BY rnd([II.ImageID])
 </CFQUERY>
0
 
LVL 10

Expert Comment

by:substand
ID: 9699314
it's not returning random results because even though the sql spec calls for it to, two things might be happening:

1) your dbms probably just returns the first record in the db file
2) if the dbms is set up to actually find a random record instead of returning the first one, you have an index set up on one or more fields so it is returning based on the index.
0
 
LVL 1

Accepted Solution

by:
Wasistdas earned 1600 total points
ID: 9699614
Why not be simpler?

<CFQUERY name="q_GetImages" datasource="Rating">
  SELECT *
  FROM ImageIndex
</cfquery>
<cfif q_GetImages.recordcount>
<cfset random_factor=RandRange(1,q_GetImages.recordcount)>
<cfoutput query="q_GetImages" startrow="#random_factor#" maxrows="1">
[output]
</cfoutput>
</cfif>
0

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