Question

Help with NOT IN Subquery

Asked by: EricHoma

I have two tables, one with about 5000 records, the second with about 3000 records.  MySql is the database server for a Cold Fusion server based web site.  I have a search form where the user enters a search string.  I need to first search the first table and return results using the following query: SELECT PartNumber, Description FROM PartList WHERE PartNumber LIKE %'searchstring'% OR Description LIKE %'searchstring'%.  Let's say that I get about 17 records back.  Then I need to search the 2nd table for similar records but I want to exclude part numbers that were found in the first query.  I tried this: SELECT PartNumber, Description from OtherPartList WHERE (PartNumber LIKE %'searchstring'% OR Description LIKE %'searchstring'%) AND PartNumber NOT IN (SELECT PartNumber, Description FROM PartList WHERE PartNumber LIKE %'searchstring'% OR Description LIKE %'searchstring'%).  The 2nd search query seems to chug along forever and consume all sorts of server resources.  Am I on the wrong track here?  Doing it wrong, phase of the moon.....  Please Help!

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Asked On
2009-10-30 at 02:10:13ID24857405
Topics

MySQL Server

,

ColdFusion Application Server

Participating Experts
2
Points
125
Comments
5

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Answers

 

by: angelIIIPosted on 2009-10-30 at 02:25:54ID: 25701250

NOT IN ( ) must be 1 field ...
aka:

AND PartNumber NOT IN (SELECT PartNumber FROM PartList  ...

 

by: Roads_RoadsPosted on 2009-10-30 at 02:27:18ID: 25701258

try to split the queries for the beginning,
how long does it take to select the search values from the second table ?

maybe you could select them into some temporary table and then search from then ?

SELECT PartNumber, Description FROM PartList WHERE PartNumber LIKE %'searchstring'% OR Description LIKE %'searchstring'%

 

by: EricHomaPosted on 2009-10-30 at 09:14:28ID: 25704401

I made a mistake in my example, it is one field.  Here is the corrected example:

SELECT PartNumber, Description from OtherPartList WHERE (PartNumber LIKE %'searchstring'% OR Description LIKE %'searchstring'%) AND PartNumber NOT IN (SELECT PartNumber FROM PartList WHERE PartNumber LIKE %'searchstring'% OR Description LIKE %'searchstring'%).

 

by: angelIIIPosted on 2009-10-30 at 09:44:16ID: 25704716

this should do:

SELECT ol.PartNumber, ol.Description 
  from OtherPartList ol
 WHERE ( ol.PartNumber LIKE '%searchstring%'
      OR ol.Description LIKE '%searchstring%'
      ) 
   AND NOT EXISTS( SELECT Null 
                     FROM PartList pl
                    WHERE p1.PartNumber = ol.PartNumber
                      AND ( pl.PartNumber LIKE '%searchstring%'
                         OR pl.Description LIKE '%searchstring%'
                          )
                   )
                                              
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by: EricHomaPosted on 2009-10-30 at 12:32:08ID: 31647909

Learned something new each and every day!  Thank you very much, now I can move forward to the next challenge.

20120131-EE-VQP-002

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