Question

示例：

--table for illustration--
create table #temp (dd int, typeId int, cl smallint)
insert into #temp (dd, typeId, cl)
values (1,681,75)
insert into #temp (dd, typeId, cl)
values (1,815,75)
insert into #temp (dd, typeId, cl)
values (2,681,75)
insert into #temp (dd, typeId, cl)
values (2,815,75)
insert into #temp (dd, typeId, cl)
values (3,681,75)
insert into #temp (dd, typeId, cl)
values (3,681,100)
insert into #temp (dd, typeId, cl)
values (4,681,75)

我正在寻找的查询应该带有唯一的dd（第一列）

select distinct dd, case when typeId = 681 then 'True'
end as BDFlagStatus,
case when typeId = 815 then 'True' 
end as ODFlagStatus
from #temp

resut是......

dd  BDFlagStatus    ODFlagStatus
1   NULL    TRUE
1   TRUE    NULL
2   NULL    TRUE
2   TRUE    NULL
3   TRUE    NULL
4   TRUE    NULL

我正在寻找......

dd  BDFlagStatus    ODFlagStatus
1   TRUE    TRUE
2   TRUE    TRUE
3   TRUE    NULL
4   TRUE    NULL

Answer 1

试试这个。 SQLFIDDLE演示

    SELECT   dd
    ,MAX(CASE 
        WHEN typeId = 681
            THEN 'True'

        END) AS BDFlagStatus
    ,MAX(CASE 
    WHEN typeId = 815
            THEN 'True'
        END) AS ODFlagStatus
FROM #temp
group by dd

Answer 2

尝试：

;with cte
as
(
select distinct dd, case when typeId = 681 then 'True'
end as BDFlagStatus,
case when typeId = 815 then 'True' 
end as ODFlagStatus
from temp
  )
  select dd,max(BDFlagStatus),Max(ODFlagStatus)
  from cte group by dd

Fiddle Demo

在ca时获得两行而不是一行

2 个答案: