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Select Query Optimization

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Topic

Deathnote
Starting Member

4 Posts

Posted - 2012-02-12 : 21:26:35

Guyz Im new to sql and hope you guyz can help me. Ok i have 2 queries getting data from the same table and same parameters. The problem is one takes less than a second to give results and the other takes 7 minutes!!!

heres the first and the faster one

SELECT Distinct Kataban
FROM SFA_Data
WHERE Seiban='96609c' and Inspection_Type_ID='P' order by Kataban

SELECT Distinct Lens_Type
FROM SFA_Data
WHERE Seiban='96609c' and Inspection_Type_ID='P' order by Lens_Type

can someone pls explain why this happens and how i can optimize the second query? tnx

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2012-02-12 : 23:41:57

which are indexes present in the table?

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SQL Server MVP
http://visakhm.blogspot.com/

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