SQL查询执行使用参数

Question

我有问题找出为什么一个查询要花费更长的时间运行基于我换出一个参数与真实值。

DECLARE @quarter int 
DECLARE @year int 
DECLARE @countOfUnitsBought int 

set @year = 2009 
set @quarter = 1 
set @countOfUnitsBought = 4; 

with res 
as 
(
select 
o.account_id 
--,orderyear 
--,orderquarter  
from 
fmtables.[dbo].[orders] o  
--cross apply(values(year(o.[ship_date]))) as a1(orderyear) 
--cross apply(values(DatePart(quarter,(o.[ship_date])))) as a2(orderquarter)  
where 
    ship_date = (select min(ship_date) from fmtables.[dbo].[orders] mo where [account_id] = o.account_id) and 
    total_value > 0 AND 
    order_status NOT LIKE 'return%' AND 
    order_status NOT LIKE 'cancel%' AND 
    order_status NOT LIKE 'freeze%' and 
    CAST(DatePart(quarter,(o.[ship_date])) as int) = @quarter and 
    year(o.[ship_date]) = @year and 
    (select sum(quantity) from fmtables..[orders] ox inner join fmtables..[orderlines] olx on ox.order_id = olx.order_id 
         where olx.order_id = o.order_id and [product_code] in(select [product_code] from fmtables..[products] where [category_code] in('1','2','3','4'))) >= @countOfUnitsBought 

) 
select * from res; 

此查询需要43秒才能运行。

现在，如果我只需更换@quarter和改变文字

CAST(DatePart(quarter,(o.[ship_date])) as int) = 1 and 

现在只需1秒。

任何人都可以请给我一个线索，为什么，如果我需要改变一些铸件来帮助。 感谢 斯科特

编辑：

所以我设法得到它嗖嗖通过与大家的意见帮助。 我使用了从输入中传递参数，然后通过过程中的“本地”变量的混合。

alter procedure [dbo].[Lifetime_HeadsetUnits] 
@inquarter int , @inyear int, @incountOfUnitsBought int 
as 
DECLARE @quarter int 
DECLARE @year int 
declare @countOfUnitsBought int 

select @quarter = @inquarter 
select @year = @inyear 
select @countOfUnitsBought = @incountOfUnitsBought 

并且还 OPTION（OPTIMIZE FOR（@quarter = 1））
作为最终输出查询的一部分。

Answer 1

试试这个。我重写了日期部分，因此可以使用索引，并且数据库不会对所有行进行长时间计算。换句话说，我做了你的日期计算sargable：

DECLARE @quarter int 
DECLARE @year int 
DECLARE @countOfUnitsBought int 

set @year = 2009 
set @quarter = 1 
declare @from datetime = dateadd(quarter, @quarter - 1, cast(@year as char(4))) 

set @countOfUnitsBought = 4; 

with res 
as 
(
    select 
    o.account_id 
    from 
    fmtables.[dbo].[orders] o  
    where 
    ship_date = 
     (select min(ship_date) 
     from fmtables.[dbo].[orders] mo 
     where [account_id] = o.account_id) and 
    total_value > 0 AND 
    order_status NOT LIKE 'return%' AND 
    order_status NOT LIKE 'cancel%' AND 
    order_status NOT LIKE 'freeze%' and 
    o.[ship_date] >= @quarter and 
    o.[ship_date] < DATEADD(QUARTER, 1, @from) and 
    (select sum(quantity) from fmtables..[orders] ox  
    inner join fmtables..[orderlines] olx on ox.order_id = olx.order_id 
    where [product_code] in(select [product_code] from fmtables..[products] 
    where [category_code] in('1','2','3','4'))) >= @countOfUnitsBought 
) 
select * from res; 

你正在运行sql-server 2008吗？有一个bug也可以解释您的性能问题。