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declare @a datetime
set @a=getdate()
SELECT Material_Code FROM dbo.BAS_Material
select [语句执行花费时间(毫秒)]=datediff(ms,@a,getdate())
declare @b datetime
set @b=getdate()
SELECT Material_Code FROM dbo.BAS_Material group by Material_Code
select [语句执行花费时间(毫秒)]=datediff(ms,@b,getdate())
declare @c datetime
set @c=getdate()
SELECT Material_Code FROM dbo.BAS_Material order by Material_Code
select [语句执行花费时间(毫秒)]=datediff(ms,@c,getdate())
结果显而易见：
