SQL Server n 次固定数据透视答案

【问题标题】：SQL Server n Times Fixed PivotSQL Server n 次固定数据透视
【发布时间】：2016-10-17 09:08:19
【问题描述】：

因此，业务人员要求我以特定方式显示数据。他们需要为特定值显示 X 列，如果该值不存在，则用零填充。

换句话说，我有什么：

我需要什么：

我不知道我是否应该使用枢轴或 CTE 和循环来解决此问题...您能帮帮我吗？

使用 SQL Server 2008。

【问题讨论】：

标签： sql-server pivot rows common-table-expression

【解决方案1】：

您可以使用ROW_NUMBER 和条件聚合来执行此旋转

WITH cte
     AS (SELECT RECORD_ID,
                NUMBER,
                Row_number() OVER(PARTITION BY RECORD_ID ORDER BY NUMBER ) AS RN
         FROM   yourtable)
SELECT RECORD_ID,
       COALESCE(Max(CASE WHEN rn = 1 THEN NUMBER END),0) AS NUMBER01,
       COALESCE(Max(CASE WHEN rn = 2 THEN NUMBER END),0) AS NUMBER02,
       COALESCE(Max(CASE WHEN rn = 3 THEN NUMBER END),0) AS NUMBER03,
       COALESCE(Max(CASE WHEN rn = 4 THEN NUMBER END),0) AS NUMBER04,
       COALESCE(Max(CASE WHEN rn = 5 THEN NUMBER END),0) AS NUMBER05,
       ...
       COALESCE(Max(CASE WHEN rn = 10 THEN NUMBER END),0) AS NUMBER10
FROM   CTE
GROUP  BY RECORD_ID

动态方法

DECLARE @x        INT = 10, -- Replace it with required of columns 
        @intr     INT = 1,
        @col_list VARCHAR(8000)='',
        @sql      VARCHAR(max)=''

SET @sql = '    WITH cte
         AS (SELECT RECORD_ID,
                    NUMBER,
                    Row_number() OVER(PARTITION BY RECORD_ID ORDER BY NUMBER ) AS RN
             FROM   yourtable)
    SELECT RECORD_ID, '


/*nothing to worry about the below while loop it is just to frame the string*/
WHILE @intr <= @x
  BEGIN
      SET @col_list += 'COALESCE(Max(CASE WHEN rn = ' + Cast(@intr AS VARCHAR(50)) + ' THEN NUMBER END),0) AS NUMBER' + Cast(@intr AS VARCHAR(50)) + ','
      SET @intr += 1
  END

SET @col_list = LEFT(@col_list, Len(@col_list) - 1)
SET @sql += @col_list + ' FROM   CTE
    GROUP  BY RECORD_ID '

EXEC ( @sql )

【讨论】：