所以我试图运行一个查询,发现它产生了一个我不清楚的错误。
select a.employer_id, a.customer_id, s.service, count(a.account_num) as "TOTAL_COUNT"
from dhs01.msa_account a
left outer join dhs01.alt_services s
on a.customer_id = s.customer_id
and s.service = 'TH'
and a.employer_id not in (select s2.employer_id from dhs01.alt_services s2 where s2.service = 'TE') -<<<<----- THIS IS THE BAD LINE
where
a.ACCT_MAINT_FEE = 'E'
AND a.STAT = 'O'
AND a.OPEN_CONFIRM_DATE < (CURRENT_DATE - (DAY(CURRENT_DATE)-1) DAYS) ---first of the current
group by a.employer_id, a.customer_id, s.service;
查询非常接近工作,但出于某种原因,子选择查询会抛出一个错误(如果我去掉子选择,我得到的结果基本上是正确的,除了没有排除那些我想排除的结果)。 在db2中,我一般都会看到subselects在on子句中的工作,实际上也有类似的例子。
试试。
from dhs01.msa_account a
left join table
(
select s.*
from dhs01.alt_services s
where s.customer_id = a.customer_id and s.service = 'TH'
and not exists
(
select 1
from dhs01.alt_services s2
where s2.service = 'TE' and s2.employer_id = a.employer_id
)
) s on 1=1
而不是:
from dhs01.msa_account a
left outer join dhs01.alt_services s
on a.customer_id = s.customer_id
and s.service = 'TH'
and a.employer_id not in (select s2.employer_id from dhs01.alt_services s2 where s2.service = 'TE') -<<<<----- THIS IS THE BAD LINE
你的查询似乎是完全正确的,但你仍然可以使用下面的查询。
SELECT a.employer_id,
a.customer_id,
s.service,
COUNT(a.account_num) AS "TOTAL_COUNT"
FROM dhs01.msa_account a
LEFT OUTER JOIN dhs01.alt_services s
ON a.customer_id = s.customer_id
AND s.service = 'TH'
WHERE a.acct_maint_fee = 'E'
AND a.stat = 'O'
AND a.open_confirm_date < (CURRENT_DATE - (DAY(CURRENT_DATE)-1) DAYS) --first of the current
AND NOT EXISTS (SELECT NULL
FROM dhs01.alt_services s2
WHERE s2.service = 'TE'
AND a.employer_id = s2.employer_id)
GROUP BY a.employer_id,
a.customer_id,
s.service;
On Clause
:select a.employer_id, a.customer_id, s.service, count(a.account_num) as "TOTAL_COUNT"
from dhs01.msa_account a
left outer join dhs01.alt_services s
on a.customer_id = s.customer_id
and s.service = 'TH'
and a.employer_id <> (select distinct s2.employer_id from dhs01.alt_services s2 where s2.service = 'TE' and a.employer_id=s2.employer_id)
where
a.ACCT_MAINT_FEE = 'E'
AND a.STAT = 'O'
AND a.OPEN_CONFIRM_DATE < (CURRENT_DATE - (DAY(CURRENT_DATE)-1) DAYS) ---first of the current
group by a.employer_id, a.customer_id, s.service;
service = 'TE'
在执行时间较短的情况下,你应该尝试以下查询:-。select a.employer_id, a.customer_id, s.service, count(a.account_num) as "TOTAL_COUNT"
from dhs01.msa_account a
left outer join dhs01.alt_services s
on a.customer_id = s.customer_id
and s.service = 'TH'
where
a.ACCT_MAINT_FEE = 'E'
AND a.STAT = 'O'
AND a.OPEN_CONFIRM_DATE < (CURRENT_DATE - (DAY(CURRENT_DATE)-1) DAYS) ---first of the current
AND not exists(select 1 from dhs01.alt_services s2 where s2.service = 'TE' and a.employer_id=s2.employer_id)
group by a.employer_id, a.customer_id, s.service;