Query Optimisation in SQL Server 2008 R2

问题

I know this question is asked frequently here but I have some different requirements.

I want to get this output. I am getting this also with my logic but can this can be done in more simple and optimised way. To run this query faster.

Here is my query:

select 
    ISNULL('PortFolio Code: '+a.CPORTFOLIOCODE,'Grand Total') as [PortFolio Code],
    COUNT(SZCUSTOMERNO) as [Accounts],
    CAST(COUNT(SZCUSTOMERNO) * 100 / (Select COUNT(SZCUSTOMERNO) 
                                      from dbo.COL_TRN_AGREEMENT) 
                                      as nvarchar(50))+' %' as [%],
    sum(case when a.SZBUCKETCODE =1 then a.FOSAMT else 0 end ) as [Bucket :1],
    sum(case when a.SZBUCKETCODE =2 then a.FOSAMT else 0 end ) as [Bucket :2],
    sum(case when a.SZBUCKETCODE =3 then a.FOSAMT else 0 end ) as [Bucket :3],
    sum(a.FOSAMT) as [All Buckets] 
from 
    dbo.COL_TRN_AGREEMENT a 
group by 
    a.CPORTFOLIOCODE with rollup

I am getting this output

Can this be done using simple logic with faster execution or this is the simplest way.

回答1:

Here is an approach, may not be faster, but you still have a choise to compare.

declare @cnt int
Select @cnt = COUNT(SZCUSTOMERNO) from dbo.COL_TRN_AGREEMENT

;with 
matrix (SZBUCKETCODE,Bucket_1,Bucket_2,Bucket_3) as 
       (select 1,1,0,0 union
        select 2,0,1,0 union
        select 3,0,0,1)
select isnull('PortFolio Code: '+a.CPORTFOLIOCODE,'Grand Total') as [PortFolio Code],
       COUNT(SZCUSTOMERNO) as [Accounts],
       cast(COUNT(SZCUSTOMERNO)*100/@cnt as nvarchar(50))+' %' as [%],
       sum(a.FOSAMT*m.Bucket_1) as [Bucket :1],
       sum(a.FOSAMT*m.Bucket_2) as [Bucket :2],
       sum(a.FOSAMT*m.Bucket_3) as [Bucket :3],
       sum(a.FOSAMT) as [All Buckets] 
  from dbo.COL_TRN_AGREEMENT a 
  join matrix m
    on m.SZBUCKETCODE = a.SZBUCKETCODE 
 group by a.CPORTFOLIOCODE with rollup

来源：https://stackoverflow.com/questions/25986902/query-optimisation-in-sql-server-2008-r2

标签

sql

sql-server

sql-server-2008-r2