需要由表理清命名

Question

我有一个像下面

termnum  dialnum   carrier   cic   mou 
8007779898 8007779898  LEVEL3   432   86,466 
8886605890 8886605890  LEVEL3   5102   83,302 
8779069811 8779069811  LEVEL3   432   69,955 
8779069811 8779069811  LEVEL3   432   69,955 

下面是我使用来获得上表中查询表：

select c.termnum, c.dialnum, c.carrier, c.cic, sum(c.calldur)/60 

from tablec c 
left join tablea a 
on c.dialnum = a.NUMBER8XX 
group by c.termnum, c.dialnum, c.carrier, c.cic 

union 

select c.termnum, c.dialnum, c.carrier, c.cic, sum(c.calldur)/60 

from tablec c 
left join tableb b 
on c.dialnum = b.NUMBER8XX 
group by c.termnum, c.dialnum, c.carrier, c.cic 

Termnum和dianlnum从具体来表格，我试图根据这些数据来整理我的数据。我尝试了不同的案例陈述，但没有结果。 我想获得的数据，因此它看起来象下面这样：使用common table expression

termnum   dialnum   carrier  cic mou table a  table b 
8007779898  8007779898  LEVEL3  432 86,466 X 
8886605890  8886605890  LEVEL3  5102 83,302    X 
8779069811  8779069811  LEVEL3  432 69,955 X   X 

Answer 1

要给你聚集，然后用case表达与exists()确定dialnum存在于哪些表

;with cte as (
    select c.termnum, c.dialnum ,c.carrier ,c.cic ,sum(c.calldur)/60 as mou 
    from tablec c 
    group by c.termnum, c.dialnum, c.carrier, c.cic 
) 
select c.* 
    , table_a = case when exists (select 1 from tablea a where a.NUMBER8XX = c.dialnum) then 'x' else '' end 
    , table_b = case when exists (select 1 from tableb b where b.NUMBER8XX = c.dialnum) then 'x' else '' end 
from cte c 

。

---

刻录而不common table expression：

select c.* 
    , table_a = case when exists (select 1 from tablea a where a.NUMBER8XX = c.dialnum) then 'x' else '' end 
    , table_b = case when exists (select 1 from tableb b where b.NUMBER8XX = c.dialnum) then 'x' else '' end 
    from (
    select c.termnum, c.dialnum ,c.carrier ,c.cic ,sum(c.calldur)/60 as mou 
    from tablec c 
    group by c.termnum, c.dialnum, c.carrier, c.cic 
    ) c 

Answer 2

根本不需要case。只需在结果中添加一个静态列即可。

select c.termnum, c.dialnum, c.carrier, c.cic, sum(c.calldur)/60, 'A' as SourceTable 

from tablec c 
left join tablea a 
on c.dialnum = a.NUMBER8XX 
group by c.termnum, c.dialnum, c.carrier, c.cic 

union 

select c.termnum, c.dialnum, c.carrier, c.cic, sum(c.calldur)/60, 'B' as SourceTable 

from tablec c 
left join tableb b 
on c.dialnum = b.NUMBER8XX 
group by c.termnum, c.dialnum, c.carrier, c.cic