-2

たとえば、1つのテーブルから列を2回取得しようとしています。

select M.Event_Name as 'Male',
       F.Event_Name as 'Female' 
from   Table1 M, Table1 F
where  M.Gender = 'M'
       and F.Gender = 'F'
       and F.Country = 12
       and M.Country = 12

表1データ

ID    Event_Name   Gender  Country
1     Cricket      M       12
2     FootBall     M       13
3     BasketBall   M       12
4     Hockey       M       12
5     Tennis       M       13
6     Volly Ball   M       13
7     Cricket      F       13
8     FootBall     F       13
9     BasketBall   F       12
10    Hockey       F       13
11    Tennis       F       12
12    Volly Ball   F       12

私が得たものは： 

Male           Female
Cricket        Tennis
Cricket        BasketBall
Cricket        Volly ball
BasketBall     Tennis
BasketBall     BasketBall
BasketBall     Volly ball
Hockey         Tennis
Hockey         BasketBall
Hockey         Volly ball

期待：

Male          Female
Cricket       Tennis
BasketBall    BasketBall
Hockey        Volly ball

私を助けて..ありがとう

4

1 に答える 1

0

あなたは：を組み込んだこのようなものを使うことができるはずですPIVOT：

select M as Male, 
  F as Female
from
(
  select event_name, gender,
    row_number() over(partition by gender, country order by id) rn
  from yourtable
  where gender in ('M', 'F')
    and country = 12
) src
pivot
(
  max(event_name)
  for gender in (M, F)
) piv

SQL FiddlewithDemoを参照してください

CASEまたは、次のステートメントで集計関数を使用できます。

select 
  max(case when gender = 'M' then event_name end) male,
  max(case when gender = 'F' then event_name end) female
from
(
  select event_name, gender,
      row_number() over(partition by gender, country order by id) rn
  from yourtable 
  where gender in ('M', 'F')
    and country = 12
) src
group by rn

SQL FiddlewithDemoを参照してください

どちらも同じ結果を生成します。

|       MALE |     FEMALE |
---------------------------
|    Cricket | BasketBall |
| BasketBall |     Tennis |
|     Hockey | Volly Ball |
于 2012-12-10T19:39:50.223 に答える