联盟ALL取空行

Question

我有两个查询加入union All。

SELECT select 'Finished' AS Status,amount AS amount,units As Date 
from table1 WHERE Pdate > cdate AND name =@name 
UNION ALL 
SELECT select 'Live' AS Live,amount,units 
from table1 Where Pdate = cdate And name =@name 

结果

Status  amount units 
Finished  100 20 
Live   200 10 

当任一查询取空集，我只得到一个行，如果两者取空集，然后我没有行

所以，我怎样才能得到像这

Status  amount Units 
Finished  100 20 
Live   0  0 

OR

Status  amount Units 
Finished  0  0 
Live   200 10 

OR

Status  amount Units 
Finished  0   0 
Live   0   0 

感谢。

Answer 1

我会认为你可以使用总和？如果总和不返回0时没有行然后用Coalesce(sum(amount), 0) as amount

SELECT select 'Finished' AS Status,sum(amount) AS amount, sum(units) As Unit 
from table1 WHERE Pdate > cdate AND name =@name 
UNION ALL 
SELECT select 'Live' AS Status, sum(amount) as amount, sum(units) as Unit 
from table1 Where Pdate = cdate And name =@name 

更换，如果你是不是想总结的结果那么就应该合并工作？ coalesce(amount, 0) As amount等...

Answer 2

我只想指出，你的查询是不必要的复杂，嵌套选择和联合所有。编写查询的更好方法是：

select (case when pdate > cdate then 'Finished' else 'Live' end) AS Status, 
     amount AS amount, units As Date 
from table1 
WHERE Pdate >= cdate AND name = @name 

此查询不会生成您想要的内容，因为它只生成有数据的行。

获取附加行的一种方法是增加原始数据，然后检查是否需要。

select status, amount, units as Date 
from (select Status, amount, units, 
      row_number() over (partition by status order by amount desc, units desc) as seqnum 
     from (select (case when pdate > cdate then 'Finished' else 'Live' end) AS Status, 
        amount, units, name 
      from table1 
      WHERE Pdate >= cdate AND name = @name 
      ) union all 
      (select 'Finished', 0, 0, @name 
      ) union all 
      (select 'Live', 0, 0, @name 
      ) 
     ) t 
where (amount > 0 or units > 0) or 
     (seqnum = 1) 

这增加了你想要的额外行。然后列举它们，所以它们会以任何顺序走到最后。它们被忽略，除非它们是序列中的第一个。

Answer 3

尝试这样的事情

with stscte as 
(
select 'Finished' as status 
union all 
select 'Live' 
), 
datacte 
as(
select 'Finished' AS Status,amount AS amount,units As Date 
from table1 WHERE Pdate > cdate AND name =@name 
UNION ALL 
select 'Live' ,amount,units 
from table1 Where Pdate = cdate And name =@name 
) 
select sc.status,isnull(dc.amount,0) as amount,isnull(dc.unit,0) as unit 
from stscte sc left join datacte dc 
on sc.status = dc.status