求下部SQL语句优化

2013-03-26

求下面SQL语句优化。select companyid bmdm1,count(distinct claimno) pretidiao from v_claimInfo2010wher

求下面SQL语句优化。
select companyid bmdm1,count(distinct claimno) pretidiao from v_claimInfo2010
where  isPreResearch='1'
and claimno not in (select claimno  from claimCoordinateRes where type= '2' )
and (status='5')  and 1=1
and (trunc(endorOverDate,'DD') >= to_date('2010-01-01','YYYY-MM-DD') and trunc(endorOverDate,'DD') <=to_date('2010-12-31','YYYY-MM-DD'))
group by companyid
order by companyid

初步分析是not in影响效率，据说写成EXISTS会提高效率，如何写呢？
[解决办法]


select companyid bmdm1,count(distinct claimno) pretidiao 
from v_claimInfo2010
where isPreResearch='1'   
and (status='5')   
and (trunc(endorOverDate,'DD') between to_date('2010-01-01','YYYY-MM-DD') and to_date('2010-12-31','YYYY-MM-DD'))   
and not exists (select 1 from claimCoordinateRes where type='2' and claimCoordinateRes.claimno=v_claimInfo2010.claimno)
group by companyid
order by companyid;

[解决办法]
--飞一般的感觉
SELECT a.Companyid Bmdm1, COUNT(DISTINCT a.Claimno) Pretidiao
  FROM v_Claiminfo2010 a, Claimcoordinateres b
WHERE a.Claimno = b.Claimno
   AND a.Endoroverdate >= DATE
'2010-01-01'
   AND a.Endoroverdate <
       To_Date('2010-12-31 00:00:01', 'yyyy-mm-dd hh:mi:ss')
   AND a.Ispreresearch = '1'
   AND b.TYPE = 2
   AND a.Status = '5'

[解决办法]
还有在你的claimCoordinateRes 表中的claimno列上建立一个索引

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求下部SQL语句优化