如何转动多个记录

Question

这是我的桌面结构！

create table t(floor int,apt int)
insert into t values(1,1),(1,2),(1,4),(2,5),(2,6),(2,7)

我想要这样！

floor   room1   room2   room3
1       1       2       4
2       5       6       7

Answer 1

在这种情况下使用PIVOT。

SELECT * FROM
(
    SELECT floor,
           apt,
           NumberedApt = 'room' + CAST(ROW_NUMBER() OVER 
               (PARTITION BY floor ORDER BY apt) AS NVARCHAR(100))               
    FROM   t   
) AS OrderApts
PIVOT (MAX(apt) FOR Numberedapt IN (room1, room2, room3)) AS PivotedApts

以上是上述工作的SQLFiddle。

如果您要获得更多“房间”列，那么您可能需要考虑使用动态数据透视表，但由于没有查询计划，它们可能效率低下。

Answer 2

More on pivot here

1.您需要逐层使用Row_number()分区来获取行然后转动以获得您的要求

select p.floor,p.[1] as room1,p.[2] as room2,p.[3] as room3 from
(
select floor,apt,row_number() over(partition by floor order by apt) as rn from #t) as t

pivot
( 
min(t.apt)
for t.rn in([1],[2],[3]) 
)as p;

See in Action