Question

所以我有一系列摊还时间表，我想运行一个查询，以便在每个时间表上返回五月份的余额

我现在的查询，看起来像这样

select ace.date, ace.balance, aacs.date, aacs.balance, 
axl.date, axl.balance, la.date, la.balance, 
mrh.date, mrh.balance
from 
(select *
from [Entity1]
where MONTH (date) = 05 AND YEAR (date) = 2017) as ACE
full join
(select *
from [Entity2]
where MONTH (date) = 05 AND YEAR (date) = 2017) as AACS
on ACE.GLCredited = AACS.GLCredited
full join 
(select *
from [Entity3]
where MONTH (date) = 05 AND YEAR (date) = 2017) as AXL
on AXL.GLCredited = AACS.GLCredited
full join
(select *
from [Entity4]
where MONTH (date) = 05 AND YEAR (date) = 2017) as LA
on LA.GLCredited = AXL.GLCredited 
full join 
(select *
from [Entity5]
where MONTH (date) = 05 AND YEAR (date) = 2017) as MRH
on MRH.GLCredited = LA.GLCredited

这是它返回的内容

    date     |  balance     |    date      |    balance   |    date      |    balance   |    date      |    balance   |    date      |    balance    | 
------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------  |
NULL         | NULL         | 2017-05-31   | 563275.00    | NULL         | NULL         | NULL         | NULL         | NULL         | NULL          |
------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------  |
2017-05-31   | 896337.00    | NULL         | NULL         | NULL         | NULL         | NULL         | NULL         | NULL         | NULL          |
------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------  |
NULL         | NULL         | NULL         | NULL         | 2017-05-31   | 3746167.00   | NULL         | NULL         | NULL         | NULL          |
------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------  |
NULL         | NULL         | NULL         | NULL         | NULL         | NULL         | 2017-05-01   | 474774.00    | NULL         | NULL          |
------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------ | ------------  |
NULL         | NULL         | NULL         | NULL         | NULL         | NULL         | NULL         | NULL         | 2017-05-31   | 127987.00     |

有没有你知道的方法，那将返回没有空值的数据？

Picture of database

Answer 1

您可以使用union而不是join来执行此操作。类似的东西：

select date, balance
from [Entity1]
where MONTH (date) = 05 AND YEAR (date) = 2017) as ACE
union
select date, balance
from [Entity2]
where MONTH (date) = 05 AND YEAR (date) = 2017) as AACS
on ACE.GLCredited = AACS.GLCredited
union
select date, balance
from [Entity3]
where MONTH (date) = 05 AND YEAR (date) = 2017) as AXL
on AXL.GLCredited = AACS.GLCredited
union
select date, balance
from [Entity4]
where MONTH (date) = 05 AND YEAR (date) = 2017) as LA
on LA.GLCredited = AXL.GLCredited 
union
select date, balance
from [Entity5]
where MONTH (date) = 05 AND YEAR (date) = 2017) as MRH
on MRH.GLCredited = LA.GLCredited

Answer 2

您可以使用UNION：

Select * 
FROM
(
select 'ACE' as ScheduleName, date, balance from [Entity1]
union
select 'AACS' as ScheduleName, date, balance from [Entity2]
union
select 'AXL' as ScheduleName, date, balance from [Entity3]
union
select 'LA' as ScheduleName, date, balance from [Entity4]
union
select 'MRH' as ScheduleName, date, balance from [Entity5]
)u
where MONTH (date) = 05 AND YEAR (date) = 2017

Answer 3

您可以轻松地在所有子查询中添加IS NOT NULL。因此，从子查询中获得的返回值不包括NULL

  ....
  from 
   from [Entity1]
   where MONTH (date) = 05 AND YEAR (date) = 2017 and *DATE is not null*) as ACE
  join
 (select *
  from [Entity2]
   where MONTH (date) = 05 AND YEAR (date) = 2017 *and BALANCE is not null*) as AACS
  on ACE.GLCredited = AACS.GLCredited
  join

使用where子句加入多个Select查询

3 个答案: