sql-server - SQL 服务器：将行转换为列

Question

CTE 的输出：

colName
-----------------------
branch1    
branch1    
branch1    
unclassified

我想将行转换为列，例如：

 colName         colName    colName    colName
 ---------------------------------------------
 unclassified    branch1    branch1    branch1

请让我知道最好的方法。

提前致谢！！

Answer 1

在没有看到您的完整查询的情况下，我建议您将 a 添加row_number()到您的 CTE 中，然后根据行号旋转数据：

;with cte as
(
    select *,  -- replace * with your column names
        ROW_NUMBER() over(partition by colName order by colName) rn
    from yourdata
)
select [1] as colName1, 
    [2] as colName2, 
    [3] as colName3, 
    [4] as colName4
from cte
pivot
(
    max(colName)
    for rn in ([1], [2], [3], [4])
) piv;

如果您不想使用 PIVOT 函数，那么您也可以使用带有 CASE 表达式的聚合函数：

;with cte as
(
    select *,  -- replace * with your column names
        ROW_NUMBER() over(partition by colName order by colName) rn
    from yourdata
)
select 
    MAX(case when rn = 1 then colName end) colName1,
    MAX(case when rn = 2 then colName end) colName2,
    MAX(case when rn = 3 then colName end) colName3,
    MAX(case when rn = 4 then colName end) colName4
from cte
-- group by other columns in select if needed