将列旋转为行，反之亦然

Question

我正在尝试转入列，但我一直遇到错误。我不知道我做错了什么。我尝试了下面的代码，但我一直在“FOR”和括号中的第一个单词下看到红色的波浪线。这是我的代码：

select d.City,d.Geographic_Region_Name, d.Site_Type
from Site_Profile as d
pivot
(City for Geographic_Region_Name in (City,Geographic_Region_Name,site_type) as pivotable;

Answer 1

Pivot 用于将 聚合行 转换为列。来自documentation：

SELECT <non-pivoted column>,  
    [first pivoted column] AS <column name>,  
    [second pivoted column] AS <column name>,  
    ...  
    [last pivoted column] AS <column name>   FROM  
    (<SELECT query that produces the data>)   
    AS <alias for the source query>   PIVOT   (  

相关线路：

<aggregation function>(<column being aggregated>)

其他的

    FOR    [<column that contains the values that will become column headers>]   
    IN ( [first pivoted column], [second pivoted column],  
    ... [last pivoted column])   ) AS <alias for the pivot table>   
    <optional ORDER BY clause>;

您需要在FOR 之前使用聚合函数（SUM、COUNT、MAX、MIN 等）。