SQL语句中的union怎样将相同数据合并 ，急急急
select 时间 = Case when month(CreateDate) in (1,2,3) then '1季度' when month(CreateDate) in (4,5,6) then '2季度'
when month(CreateDate) in (7,8,9) then '3季度' when month(CreateDate) in (10,11,12) then '4季度' end ,
sum(AllOutput) as 削减量,sum(AllAllowOutput) as 排放量,sum(AllPreOutput) as 批复量
from DirtyOutputControl where AliasName='化学需氧量' and Year(CreateDate) = Year(getdate())
group by
Case when month(CreateDate) in (1,2,3) then '1季度' when month(CreateDate) in (4,5,6) then '2季度'
when month(CreateDate) in (7,8,9) then '3季度' when month(CreateDate) in (10,11,12) then '4季度' end
union
select '1季度' as [quarter],0 as AllOutput,0 as AllAllowOutput,0 as AllPreOutput
union
select '2季度' as [quarter],0 as AllOutput,0 as AllAllowOutput,0 as AllPreOutput
union
select '3季度' as [quarter],0 as AllOutput,0 as AllAllowOutput,0 as AllPreOutput
union
select '4季度' as [quarter],0 as AllOutput,0 as AllAllowOutput,0 as AllPreOutput

查询出的数据是这样的子的

1季度 NULL 2.00000 2.00000
1季度 0.00000 0.00000 0.00000
2季度 NULL NULL NULL
2季度 0.00000 0.00000 0.00000
3季度 0.00000 0.00000 0.00000
4季度 0.00000 0.00000 0.00000


我想查询出的效果是这样子的
1季度 0.00000 2.00000 2.00000
2季度 0.00000 0.00000 0.00000
3季度 0.00000 0.00000 0.00000
4季度 0.00000 0.00000 0.00000

[解决办法]
加一个ISNULL(column,0)看看
[解决办法]
select 时间,sum(削减量),sum(排放量),sum(批复量)
from (

select 时间 = Case when month(CreateDate) in (1,2,3) then '1季度' when month(CreateDate) in (4,5,6) then '2季度'
when month(CreateDate) in (7,8,9) then '3季度' when month(CreateDate) in (10,11,12) then '4季度' end ,
sum(AllOutput) as 削减量,sum(AllAllowOutput) as 排放量,sum(AllPreOutput) as 批复量
from DirtyOutputControl where AliasName='化学需氧量' and Year(CreateDate) = Year(getdate())
group by
Case when month(CreateDate) in (1,2,3) then '1季度' when month(CreateDate) in (4,5,6) then '2季度'
when month(CreateDate) in (7,8,9) then '3季度' when month(CreateDate) in (10,11,12) then '4季度' end
union
select '1季度' as [quarter],0 as AllOutput,0 as AllAllowOutput,0 as AllPreOutput
union
select '2季度' as [quarter],0 as AllOutput,0 as AllAllowOutput,0 as AllPreOutput
union
select '3季度' as [quarter],0 as AllOutput,0 as AllAllowOutput,0 as AllPreOutput
union
select '4季度' as [quarter],0 as AllOutput,0 as AllAllowOutput,0 as AllPreOutput
) x