Question

嗨，我有一张像这样的桌子

C_DATE     SOURCE
11/21/2012  A
11/22/2012  A
11/22/2012  A
11/22/2012  A
11/23/2012  A
11/23/2012  A
11/25/2012  A
11/26/2012  A
11/26/2012  B
11/26/2012  B
11/26/2012  B
11/21/2012  B
11/22/2012  B
11/22/2012  B
11/23/2012  B
11/23/2012  C
11/24/2012  C
11/24/2012  C
11/24/2012  C
11/24/2012  C
11/25/2012  C

我如何按来源和日期计算如下：
c_date来源b来源c

11/21/2012 1 4 0 
11/22/2012 1 1 1 
11/23/2012 0 0 1
11/24/2012 and so on..

我最接近的是

 select trunc(c_date)  XDATE,  
        (select count(**) from TABLE where source='A') A, 
        (select count(**) from TABLE where source='B') B, 
        (select count(*) from TABLE where source='C') C
 from TABLE
group by trunc(C_DATE) 
order by trunc(C_DATE) asc

但它会重复每行的总计数，我找不到如何将计数列与日期联系起来。

非常感谢你的帮助

Answer 1

select trunc(c_date)  XDATE,  
       sum(case source when 'A' then 1 else 0 end) cnt_a,      
       sum(case source when 'B' then 1 else 0 end) cnt_b,
       sum(case source when 'C' then 1 else 0 end) cnt_c,
  from TABLE
 group by trunc(C_DATE) 
 order by trunc(C_DATE) asc

更新只要您使用11g，就可以使用现代的pivot子句：）

select xdate, a, b, c
  from 
(select trunc(c_date) XDATE, source, count(*) 
   from tab 
  group by trunc(c_date), source )     
   pivot 
( count(*) for source in ('A' a, 'B' b, 'C' c) )
order by 1;

http://sqlfiddle.com/#!4/d0269/16

Oracle SQL计数列和按日期分组

1 个答案: