carlosaamaral (9/11/2012)
SELECT table1.column1,'99',
left(table1.column2, 2),
max(table1.column3),
'Yes',
'Test'
FROM table1
WHERE NOT EXISTS ( SELECT 1
FROM TABLE2 WHERE ltrim(rtrim(table2.column1)) + ltrim(rtrim(left(table2.column2, 2)))=
ltrim(rtrim(table1.column1)) + ltrim(rtrim(left(table1.column2, 2)))
)
AND table1.column4 = 'Yes'
GROUP BY table1.column1, Left(table1.column2, 2)
The reason the original (and yours) are slow is because they are not SARGable. The where clause have functions in them which renders the indexes unusable and causes a table/index scan. The left join solution that Luis presented should prove to perform far better.
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