[英]SQL - count over partition
Please, tell me what is wrong with this:请告诉我这有什么问题:
select
p.date,
(SELECT COUNT (*) OVER (PARTITION BY p.ID_code)
FROM POOL_AREA.F_volume_GCOA p
WHERE p.end_volume_KN <> 0
AND p.date = '31-OCT-16'
AND (p.local_grade_MB IS NULL OR p.local_grade_MB ='0' OR p.local_grade_MB ='N')) AS ERROR_CNT
FROM POOL_AREA.F_volume_GCOA p
where p.date = '31-OCT-16';
Over partition part is problem, without it, it works.过度分区部分是问题,没有它,它可以工作。
Error details:
错误详情:
ORA-01427: single-row subquery returns more than one rowORA-01427: 单行子查询返回多于一行
01427. 00000 - "single-row subquery returns more than one row"01427. 00000 - “单行子查询返回多于一行”
*Cause:*原因:
*Action:*行动:
I think what you're actually after is a conditional count - something like:我认为你真正追求的是一个有条件的计数——比如:
select p.dt,
count(case when p.end_volume_kn != 0
and (p.local_grade_mb is null
or p.local_grade_mb in ('0', 'N'))
then 1
end) error_cnt
FROM POOL_AREA.F_volume_GCOA p
where p.dt = to_date('31/10/2016', 'dd/mm/yyyy')
group by p.dt;
as mentioned in the comments, something like this (not tested):如评论中所述,类似这样(未测试):
select
p.date,
t.val AS ERROR_CNT
FROM POOL_AREA.F_volume_GCOA p
JOIN (SELECT p.ID_code, COUNT (*) as val OVER (PARTITION BY p2.ID_code)
FROM POOL_AREA.F_volume_GCOA p2
WHERE p2.end_volume_KN <> 0
AND p2.date = '31-OCT-16'
AND (p2.local_grade_MB IS NULL OR p2.local_grade_MB ='0'
OR p.local_grade_MB ='N')) as t ON t.ID_Code = p.ID_code
where p.date = '31-OCT-16';
This works!这有效!
select
p.date,
(SELECT COUNT (*) FROM
(SELECT DISTINCT p.id_code
FROM POOL_AREA.F_volume_GCOA p
WHERE p.end_volume_KN <> 0
AND p.date = '31-OCT-16'
AND (p.local_grade_MB IS NULL OR p.local_grade_MB ='0' OR p.local_grade_MB ='N'))) AS ERROR_CNT
FROM POOL_AREA.F_volume_GCOA p
where p.date = '31-OCT-16';
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