MS SQL PIVOT数据透视表

以前曾经做过练习《T-SQL PIVOT 行列转换》https://www.cnblogs.com/insus/archive/2011/03/05/1971446.html

今天把拿出来，再练习。 以前透视列，需要手动指定。是否可以动态拿到呢？ 看看下面的演示：

在实现之前，得先参考这篇《列值转换为逗号分隔字符串》https://www.cnblogs.com/insus/p/10852906.html

DECLARE @pivot_cols NVARCHAR(MAX)
WITH dist_col_data AS
(
    SELECT DISTINCT [DT] FROM [dbo].[RecordHits]
)
SELECT  @pivot_cols = ISNULL(@pivot_cols + '],[', '') + CAST([DT] AS NVARCHAR(MAX)) FROM dist_col_data ORDER BY [DT];


EXECUTE ('
SELECT [RId],['+ @pivot_cols +']
FROM
(
    SELECT * FROM [dbo].[RecordHits]
) AS p
PIVOT
(
    SUM([Hits]) FOR [DT] IN (['+ @pivot_cols +'])
) AS Q;
')