sql oracle子查询分组

Question

每个日期我得到相同的电子商务编号。我正在尝试根据日期获取电子商务价值计数，每个日期的日期都不同，因为十月份的总数仅为105，而不是391958。 任何想法如何按子查询的输出分组？ 谢谢！

SELECT   to_char(wcs1.start_tms,'DD/MM/YYYY') as dates,
(
    SELECT count(*) 
    FROM   ft_t_wcs1 wcs1,ft_t_stup stup 
    WHERE  stup.modl_id='ECOMMERC'
    AND    stup.CROSS_REF_ID=wcs1.acct_id
    AND    stup.end_tms IS NULL
) AS     ecommerce
FROM     ft_t_wcs1 wcs1, ft_t_stup stup
WHERE    wcs1.scenario='CREATE' 
AND      wcs1.acct_id IS NOT NULL 
AND      wcs1.start_tms BETWEEN add_months(TRUNC(SYSDATE,'mm'),-1) AND LAST_DAY(add_months(TRUNC(SYSDATE,'mm'),-1))
GROUP BY to_char(wcs1.start_tms,'DD/MM/YYYY')
ORDER BY to_char(wcs1.start_tms,'DD/MM/YYYY');

输出

Answer 1

请尝试以下修改后的查询

select to_char(wcs1.start_tms,'DD/MM/YYYY') as dates,count(*) AS 
ecommerce
from ft_t_wcs1 wcs1, ft_t_stup stup
where stup.modl_id='ECOMMERC' and stup.CROSS_REF_ID=wcs1.acct_id and stup.end_tms is null wcs1.scenario='CREATE' and wcs1.acct_id is not null and 
wcs1.start_tms between add_months(TRUNC(SYSDATE,'mm'),-1) and 
LAST_DAY(add_months(TRUNC(SYSDATE,'mm'),-1))
group by to_char(wcs1.start_tms,'DD/MM/YYYY')
order by to_char(wcs1.start_tms,'DD/MM/YYYY');

-使用JOIN子句的另一种方式

select to_char(wcs1.start_tms,'DD/MM/YYYY') as dates,count(*) AS 
ecommerce
from ft_t_wcs1 wcs1 
join ft_t_stup stup
ON stup.CROSS_REF_ID=wcs1.acct_id
where stup.modl_id='ECOMMERC' and stup.end_tms is null wcs1.scenario='CREATE' and wcs1.acct_id is not null and 
wcs1.start_tms between add_months(TRUNC(SYSDATE,'mm'),-1) and 
LAST_DAY(add_months(TRUNC(SYSDATE,'mm'),-1))
group by to_char(wcs1.start_tms,'DD/MM/YYYY')
order by to_char(wcs1.start_tms,'DD/MM/YYYY');

Answer 2

在不理解表关系的情况下很难给出答案，但是我可以告诉您问题在于子查询和主查询之间没有关系。您的子查询仅返回一个modl_id='ECOMMERC'的计数，因此该值将始终相同-在您的情况下为105。您需要向该子查询添加一个JOIN条件，以将唯一值与您的主查询联系起来。您还希望对表名使用不同的别名，以确保正确连接。

Answer 3

当您只想要相关子查询时，您正在执行不必要的联接：

SELECT to_char(wcs1.start_tms,'DD/MM/YYYY') as dates,
       (SELECT count(*) 
        FROM ft_t_stup stup 
        WHERE stup.modl_id=  'ECOMMERC' AND
              stup.CROSS_REF_ID = wcs1.acct_id
              stup.end_tms IS NULL
       ) AS ecommerce
FROM ft_t_wcs1 wcs1
WHERE wcs1.scenario = 'CREATE' AND
      wcs1.acct_id IS NOT NULL AND
      wcs1.start_tms BETWEEN add_months(TRUNC(SYSDATE,'mm'),-1) AND LAST_DAY(add_months(TRUNC(SYSDATE,'mm'),-1))
GROUP BY to_char(wcs1.start_tms, 'DD/MM/YYYY')
ORDER BY to_char(wcs1.start_tms, 'DD/MM/YYYY');