如何提高下面语句的效率select * from(select a_month ,b_name ,count(DISTINCT a.c_no) ,dense_rank() over (partition by a_month order by COUNT( DISTINCT a.c_no) desc) rank fromsut_s aleft join cou_c bon a.ll=b.ll where a_month>='10'group by b_

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如何提高下面语句的效率select * from(select a_month ,b_name ,count(DISTINCT a.c_no) ,dense_rank() over (partition by a_month order by COUNT( DISTINCT a.c_no) desc) rank fromsut_s aleft join cou_c bon a.ll=b.ll where a_month>='10'group by b_
如何提高下面语句的效率
select * from
(
select a_month ,b_name ,count(DISTINCT a.c_no) ,
dense_rank() over (partition by a_month order by COUNT( DISTINCT a.c_no) desc) rank from
sut_s a
left join
cou_c b
on a.ll=b.ll
where a_month>='10'
group by b_name,a_month
)where rank

如何提高下面语句的效率select * from(select a_month ,b_name ,count(DISTINCT a.c_no) ,dense_rank() over (partition by a_month order by COUNT( DISTINCT a.c_no) desc) rank fromsut_s aleft join cou_c bon a.ll=b.ll where a_month>='10'group by b_
select a_month ,b_name ,count(DISTINCT a.c_no) ,
dense_rank() over (partition by a_month order by COUNT( DISTINCT a.c_no) desc) rank from
sut_s a
left join
cou_c b
on a.ll=b.ll
where a_month>='10'
group by b_name,a_month
having dense_rank() over (partition by a_month order by COUNT( DISTINCT a.c_no) desc)

如何提高下面语句的效率select * from(select a_month ,b_name ,count(DISTINCT a.c_no) ,dense_rank() over (partition by a_month order by COUNT( DISTINCT a.c_no) desc) rank fromsut_s aleft join cou_c bon a.ll=b.ll where a_month>='10'group by b_ 如何提高一下语句的效率SQL语句如下,我用的是ORACLE 10G： select a.name, b.Code EntCode, b.Name EntlName, from WF_Flow a, WF_Model b where a.EntGid = '2000000000000000000000000009087A' and b.EntGid = '200000000000 如何提高电机的效率如何提高做事的效率. 如何提高柴油机的效率如何提高内燃机的效率如何提高电机的效率如何提高做事的效率? 如何提高听课的效率? 如何提高背诵的效率如何提高背诵的效率? 如何提高记忆的效率如何提高旋流器的效率如何提高球磨机的效率? 如何提高直流电机的效率? 如何提高热机的效率?急如何提高初中物理的课堂教学效率? 如何提高作数学题的效率?