如何在SQL Server中將多行組合成一行和多列？

Question

我要通過我做了臨時表不同的表，這裏是結果集臨時表的：

 car_id | car_type | status | count 
    --------+----------+---------+------ 
    100421 | 1  | 1  | 9 
    100421 | 1  | 2  | 8 
    100421 | 1  | 3  | 3 
    100421 | 2  | 1  | 6 
    100421 | 2  | 2  | 8 
    100421 | 2  | 3  | 3 
    100422 | 1  | 1  | 5 
    100422 | 1  | 2  | 8 
    100422 | 1  | 3  | 7 

下面是狀態欄的含義：

• 1作爲銷售
• 2作爲購買
• 3作爲回報

現在我想將此resul t設置如下

car_id | car_type | sale | purchase | return 
    --------+----------+------+----------+---------- 
    100421 | 1  | 9 | 8  | 3 
    100421 | 2  | 6 | 8  | 3 
    100422 | 1  | 5 | 8  | 7 

我試過但無法生成這個結果集。誰能幫忙？

Answer 1

試試這個

select car_id ,car_type, [1] as Sale,[2] as Purchase,[3] as [return] 
from (select car_id , car_type , [status] ,[count] from tempTable)d 
pivot(sum([count]) for [status] in([1],[2],[3])) as pvt 

也可以刪除子查詢，如果你沒有任何條件 像

select car_id ,car_type, [1] as Sale,[2] as Purchase,[3] as [return] 
from tempTable d 
pivot(sum([count]) for [status] in([1],[2],[3])) as pvt 

Answer 2

你也可以使用一個CASE表達。

查詢

select [car_id], [car_type], 
max(case [status] when 1 then [count] end) as [sale], 
max(case [status] when 2 then [count] end) as [purchase], 
max(case [status] when 3 then [count] end) as [return] 
from [your_table_name] 
group by [car_id], [car_type] 
order by [car_id];