Question

I have the below query which is taking 2 seconds to execute as there is a significant number of rows (1 million + each) in the two tables and was wondering if there is anything further I can do to optimise the query.

Tables

tblInspection.ID bigint (Primary Key)

tblInspection.IsPassedFirstTime bit (Non clustered index)

tblInspectionFailures.ID bigint (Primary Key)

tblInspectionFailures.InspectionID bigint (Non clustered index)

Query

SELECT TOP 1 tblInspection.ID FROM tblInspection 
                INNER JOIN tblInspectionFailures ON tblInspection.ID = tblInspectionFailures.InspectionID 
                WHERE (tblInspection.IsPassedFirstTime = 1)

Execution Plan

I can see that I am doing clustered seeks on the indexes but its still taking some time

Answer 1

the only thing I can think of is

    SELECT  i.ID FROM 
    (select TOP 1 id from tblInspection 
     WHERE IsPassedFirstTime = 1) i
                    INNER JOIN tblInspectionFailures ON 
i.ID = tblInspectionFailures.InspectionID