Oracle SQL：ROLLUP不能正确求和

Question

Rollup似乎正确地计算单位数，但不包括列车数。任何想法可能是什么原因造成的？

查询的输出如下所示。在黄色的单位列的和是53，但汇总正显示出51的单位数增加了，虽然正确...

alt text http://img522.imageshack.us/img522/9057/ss20100330111503.png

而这里的oracle的SQL查询...

select t.year, 
    t.week, 
    decode(t.mine_id,NULL,'PF',t.mine_id) as mine_id, 
    decode(t.product,Null,'LF',t.product) as product, 
    decode(t.mine_id||'-'||t.product,'-','PF',t.mine_id||'-'||t.product) as code, 
    count(distinct t.tpps_train_id) as trains, 
    count(1) as units 

from 

(
    select trn.mine_code as mine_id, 
      trn.train_tpps_id as tpps_train_id,  
      round((con.calibrated_weight_total - con.empty_weight_total),2) as tonnes 
    from widsys.train trn 
       INNER JOIN widsys.consist con 
        USING (train_record_id) 

    where trn.direction = 'N' 
      and (con.calibrated_weight_total-con.empty_weight_total) > 10 
      and trn.num_cars > 10 
    and con.consist_no not like '_L%' 
    ) w, 

    (
     select to_char(td.datetime_act_comp_dump-7/24, 'IYYY') as year, 
      to_char(td.datetime_act_comp_dump-7/24, 'IW') as week, 
      td.mine_code as mine_id, 
      td.train_id as tpps_train_id, 
      pt.product_type_code as product 
     from tpps.train_details td 
      inner join tpps.ore_products op 
      using (ore_product_key) 
      inner join tpps.product_types pt 
      using (product_type_key) 
     where to_char(td.datetime_act_comp_dump-7/24, 'IYYY') = 2010 
      and to_char(td.datetime_act_comp_dump-7/24, 'IW') = 12 
     order by td.datetime_act_comp_dump asc 
) t 
where w.mine_id = t.mine_id 
    and w.tpps_train_id = t.tpps_train_id 

    having t.product is not null or t.mine_id is null 
    group by 
      t.year, 
      t.week, 
     rollup(
      t.mine_id, 
      t.product) 

Answer 1

我认为这是DISTINCT。 您将获得DISTINCT值的总数，而不是每条记录的不同值的总数。

select nvl(owner,'-') owner, count(distinct object_type) c1, count(*) c2 
from all_objects 
where owner in ('MDSYS','CTXSYS') 
group by rollup(owner) 

给

OWNER  C1 C2 
CTXSYS  6 82 
MDSYS  11 653 
-   11 735