Exclude the Two Highest Outliers from Query

Posted on 2007-03-21
Last Modified: 2012-05-05
The query at http:Q_22463410.html will exclude the row with an outlier (the 1 highest number) in a particular column, like this:

$sql = 'SELECT ID, Student, Score FROM scores t1 WHERE t1.Student = "Doe" AND t1.Score != (SELECT MAX(Score) FROM scores t2 WHERE t2.Student="Doe") ORDER BY Score ASC';

Is it possible to exclude the *two* rows with the highest numbers?  For example, if the scores in that column are:  500, 499, 100, 99, 100, 98, 97, 95, I would need the query to exclude both the 500 and the 499.  (I don't want to use any arbitrary cutoffs, because the numbers will vary greatly depending on the target.)
Question by:Randall-B
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LVL 143

Assisted Solution

by:Guy Hengel [angelIII / a3]
Guy Hengel [angelIII / a3] earned 250 total points
ID: 18765922
$sql = 'SELECT ID, Student, Score FROM scores t1 WHERE t1.Student = "Doe" AND t1.Score NOT IN (SELECT Score FROM scores t2 WHERE t2.Student="Doe" ORDER BY score DESC LIMIT 2) ORDER BY Score ASC';

Author Comment

ID: 18766036
   Thanks. But I'm getting an error:
     "This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery' "
   I'm using the latest version of WAMP. I think it's a 4.xx version of MySQL.  Is there any way around this limitation?  
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 18766088
no, unless you create temporary table with the subquery result
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Author Comment

ID: 18766162
OK. Then please explain how to create and use a temporary table in this situation. Thanks.
LVL 143

Accepted Solution

Guy Hengel [angelIII / a3] earned 250 total points
ID: 18766196
CREATE TABLE tmp_StudentScore
SELECT Score FROM scores t2 WHERE t2.Student="Doe" ORDER BY score DESC LIMIT 2

SELECT ID, Student, Score FROM scores t1 WHERE t1.Student = "Doe" AND t1.Score NOT IN (select Score from tmp_StudentScore ) ORDER BY Score ASC

DROP TABLE tmp_StudentScore


Author Comment

ID: 18766351
That works for me.  Thanks so much.

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