How can i rewrite this query for faster execution

Question

SELECT s1.ID FROM binventory_ostemp s1 JOIN 
( SELECT Cust_FkId, ProcessID, MAX(Service_Duration) AS duration 
 FROM binventory_ostemp WHERE ProcessID='4d2d6068678bc' AND Overall_Rank IN 
 (
  SELECT MIN(Overall_Rank) FROM binventory_ostemp WHERE ProcessID='4d2d6068678bc' GROUP BY Cust_FkId
 )
 GROUP BY Cust_FkId
) AS s2 ON s1.Cust_FkId = s2.Cust_FkId AND s1.ProcessID=s2.ProcessID 
AND s1.Service_Duration=s2.duration AND s1.ProcessID='4d2d6068678bc' 
GROUP BY s1.Cust_FkId

It just goes away if there are more than 10K rows in that table. What it does is find rows for each customer who has min. of overall rank and in those max. of service duration for a given processid

Table Data

ID Cust_FkId  Overall_Rank Service_Duration  ProcessID
1     23       2            30             4d2d6068678bc
2     23       1            45             4d2d6068678bc
3     23       1            60             4d2d6068678bc
4     56       3            90             4d2d6068678bc
5     56       2            50             4d2d6068678bc
6     56       2            85             4d2d6068678bc

Result Data

Result ID values must be 3 and 6 only

Answer 1

Following select might be faster.

(Covering) Indexes on

• Cust_FkID, Overall_Rank
• Cust_FkID, Service_Duration
• Cust_FkID, Overall_Rank, Service_Duration
• Overall_Rank
• Service_Duration

Remove the indexes that don't get used by looking at the execution plan.

SQL Statement

SELECT  b.*
FROM    binventory_ostemp b
        INNER JOIN (
          SELECT  b.Cust_FkID
                  , ovr.Overall_Rank
                  , MAX(Service_Duration) AS Service_Duration 
          FROM    binventory_ostemp b
                  INNER JOIN (
                    SELECT  Cust_FkID
                            , MIN(Overall_Rank) AS Overall_Rank
                    FROM    binventory_ostemp        
                    GROUP BY
                            Cust_FkID
                  ) ovr ON  ovr.Cust_FkID = b.Cust_FKID
                            AND ovr.Overall_Rank = b.Overall_Rank        
          GROUP BY
                  b.Cust_FkID
                  , ovr.Overall_Rank
        ) ovrs ON ovrs.Cust_FkID = b.Cust_FkID
                  AND ovrs.Overall_Rank = b.Overall_Rank
                  AND ovrs.Service_Duration = b.Service_Duration