我想使用PIVOT将行转换为列。我只有数字的例子，但我需要用VARCHAR

Question

枢需要转换以下

Country , code , result 
('IND','AC1','Completed'), 
    ('IND','AC2','Completed'), 
    ('IND','AC3','Completed'), 
    ('SL','AC1','Status'), 
    ('SL','AC2','ERROR'), 
    ('AUS','AC3','Completed') 

到

Country , ac1 , ac2 , ac3 
------------------------ 
ind , Completed , Completed , Completed 
sl, Status ,Error 
AUS, , ,Completed 

Answer 1

使用条件汇总：

select 
    Country 
    , max(case when code = 'AC1' then result else '' end) as AC1 
    , max(case when code = 'AC2' then result else '' end) as AC2 
    , max(case when code = 'AC3' then result else '' end) as AC3 
from countries 
group by Country 

使用pivot()在SQL服务器：

select 
    Country 
    , coalesce(AC1,'') as AC1 
    , coalesce(AC2,'') as AC2 
    , coalesce(AC3,'') as AC3 
from countries 
pivot (max(result) for code in (AC1,AC2,AC3)) p 

rextester演示：http://rextester.com/ZTLYWY22412

回报（两个）：

+---------+-----------+-----------+-----------+ 
| Country | AC1 | AC2 | AC3 | 
+---------+-----------+-----------+-----------+ 
| AUS  |   |   | Completed | 
| IND  | Completed | Completed | Completed | 
| SL  | Status | ERROR  |   | 
+---------+-----------+-----------+-----------+