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Tuning an Application / Reducing Load
If your whole application is performing suboptimally, or if you are attempting to
reduce the overall CPU or I/O load on the database server, then identifying
resource-intensive SQL involves the following steps:
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SQL Group By Top ʵÏÖ

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id INT,
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SELECT 1,'a','A'
UNION ALL SELECT 2,'b','C'
UNION ALL SELECT 3,'c','B'
UNION ALL SELECT 4,'d','C'
UNION ALL SELECT 5,'e','B'
UNION ALL SELECT 6,'f','A'
SELECT * from @temp AS _temp WHERE [name] IN
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