Re: getting certain rows from a group by

[Peter Brawley]

On 2012-09-18 5:53 AM, Larry Martell wrote:
I have this query:
SELECT data_target.name as Target,
        q1.ep as EP,
        COUNT(*) as Wafers,
        Lots,
        SUM(numonep)/(COUNT(*)+SUM(CASE WHEN reruns > 0 THEN reruns
ELSE 0 END)) as 'Sites/Wafer',
        MAX(LastRun) as "Last Run",
        SUM(CASE WHEN reruns > 0 THEN reruns ELSE 0 END) as Rerun,
        COUNT(*)+SUM(CASE WHEN reruns > 0 THEN reruns ELSE 0 END) as Runs,
        avgbottom as "Avg Bottom",
        3*stdbottom as "3 Sig",
        maxbottom as Max,
        minbottom as Min,
        SUM(numonep) as Count,
        SUM(numonep) - SUM(numbottoms) as NAs,
        100-((SUM(numonep) - SUM(numbottoms))/SUM(numonep)*100) as "% Success",
        3*stdbottom/avgbottom as "3Sig/Avg",
        AVG(avgbottom) as 'Wafer Avg',
        AVG(Wafer3Sigma) as 'Wafer 3 Sigma',
        AVG(Ranges) as 'Avg Range',
        3*STD(Ranges) as '3Sig of Ranges',
        MAX(Ranges) as 'Max Range',
        MIN(Ranges) as 'Min Range',
        (SUM(numonep) - SUM(numbottoms))/COUNT(*) as 'NAs/Wafer'
FROM (SELECT target_name_id,
              ep,
              wafer_id,
              COUNT(bottom) as numbottoms,
              AVG(bottom) as avgbottom,
              STD(bottom) as stdbottom,
              MAX(bottom) as maxbottom,
              MIN(bottom) as minbottom,
              MAX(date_time) as "LastRun",
              COUNT(*) as numonep,
              COUNT(DISTINCT target_name_id, ep, lot_id,
data_file_id)-1 as reruns,
              COUNT(DISTINCT(lot_id)) as Lots,
              3*STD(bottom) as Wafer3Sigma,
              MAX(bottom) - MIN(bottom) as Ranges
       FROM data_cst
       WHERE target_name_id IN (775, 776, 777, 778, 779, 780, 45, 44,
116, 117, 118, 119, 120, 121)
       AND data_cst.date_time BETWEEN '2010-03-04 00:00:00' AND
'2010-03-04 23:59:59'
       GROUP BY target_name_id, ep, wafer_id
       HAVING count(*) < 999) q1,
      data_target
WHERE data_target.id = target_name_id
GROUP BY q1.target_name_id, q1.ep;


This works fine. But now I need to get a certain column
(image_measurer_id) with each row returned that corresponds to the row
from the group that has bottom = Min(bottom), bottom = Max(bottom),
bottom closest to Avg(bottom), and bottom from the row where date_time
= Max(date_time).

Is this even possible from one query?

Might be, but what's the importance of doing it as one query? I'd start 
by saving this result to a temp table and developing the new query. When 
that's running, see if you can to optimise a query built by replacing 
the reference to the temp table with the original query.

PB




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