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Asked: 2026-05-31T02:48:39+00:00

Just trying to optimize a SQL Query. SELECT Code, COUNT(*) FROM tblData WHERE ListID

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Just trying to optimize a SQL Query.

SELECT   Code, COUNT(*) 
FROM     tblData 
WHERE    ListID = 380 
GROUP BY Code

The table contains 10 million records. So the query usually take 4-5 secs to find the record on SQL SERVER 2008 R2. I found another way of expressing it:

SELECT a.Code, COUNT(*) 
FROM   (  SELECT * 
          FROM   tblData 
          WHERE  ListID = 380 
       ) a 
GROUP BY a.Code

Though in my tests it produce the results in the exact same time. But I wonder if this is faster the previous one or visa versa. Any idea?

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1 Answer

  1. Editorial Team

    With any decent query optimizer, the two queries should boil down to the exact same operations. So I’m not surprised you find they run in the same time.

    I don’t think you can modify your query to make it run any faster. What you can do, of course, is to have an index on ListID – but I expect you have that already.

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