使用动态 Pivot 时为列名添加前缀

Question

所以我正在研究一种方法来报告来自 table 的一些数据，这些数据跟踪患者在急诊室就诊时对胸痛问题的反应。当患者到达急诊室时，他们会被问到一系列有关胸痛的问题。对于每个问题，他们都被要求将疼痛从 1 到 10 进行排序。以下是存储在 table.

中的数据

+-----------+------------+----------+
| PatientId | QuestionId | PainRank |
+-----------+------------+----------+
|     1     |      1     |     5    |
+-----------+------------+----------+
|     1     |      2     |     6    |
+-----------+------------+----------+
|     1     |      3     |     4    |
+-----------+------------+----------+
|     2     |      1     |     1    |
+-----------+------------+----------+
|     2     |      2     |     8    |
+-----------+------------+----------+
|     2     |      3     |     2    |
+-----------+------------+----------+
|     3     |      1     |     5    |
+-----------+------------+----------+
|     3     |      2     |     4    |
+-----------+------------+----------+
|     3     |      3     |     7    |
+-----------+------------+----------+

我创建了一个动态数据透视表，它将问题更改为列，这样医生就可以查看一组患者的摘要。

+-----------+---+---+---+
| PatientId | 1 | 2 | 3 |
+-----------+---+---+---+
|     1     | 5 | 6 | 4 |
+-----------+---+---+---+
|     2     | 1 | 8 | 2 |
+-----------+---+---+---+
|     3     | 5 | 4 | 7 |
+-----------+---+---+---+

我想做的是在问题编号前加上单词 "Question"，这样列就会看起来像 "Question - 1"、"Question - 2"、"Question - 3"。我想使用创建动态枢轴的 SQL 查询添加前缀，但由于枢轴是动态的，我不确定如何添加它。

这里是SQL我用来获取动态Pivot的

  -- Dynamic Pivot
DECLARE @PivotQuery AS NVARCHAR(MAX)
DECLARE @ColumnNameCollection AS NVARCHAR(MAX)

-- Get column list. A DISTINCT list of questions
SELECT @ColumnNameCollection= ISNULL(@ColumnNameCollection + ',','') 
       + QUOTENAME(QuestionId)
FROM (SELECT DISTINCT QuestionId FROM PatientChestPain) AS Questions

-- Build PIVOT query using the list of questions
SET @PivotQuery = 
  N'SELECT PatientId,  ' + @ColumnNameCollection + '
    FROM PatientChestPain
    PIVOT(MAX(PainRank) 
          FOR QuestionId IN (' + @ColumnNameCollection + ')) AS PivotTableResult'
--Execute the PIVOT query
EXEC sp_executesql @PivotQuery

我知道我可以编辑最终报告并添加 "Question - "，但是我正在尝试自动生成报告并且我只能操作 SQL.

注意：我使用 following website 生成 ascii tables。非常漂亮的界面，易于使用。我尝试创建 SQL Fiddle，但它似乎目前无法与 SQL 服务器一起使用。

Answer 1

我找到了一个简单的方法。只需创建一个 header 字符串，在其中为每一列创建一个别名

DEMO

  -- Dynamic Pivot
DECLARE @PivotQuery AS NVARCHAR(MAX)
DECLARE @ColumnNameCollection AS NVARCHAR(MAX)
DECLARE @HeaderNameCollection AS NVARCHAR(MAX)

-- Get column list. A DISTINCT list of Questions
SELECT @ColumnNameCollection= ISNULL(@ColumnNameCollection + ',','') 
       + QUOTENAME(QuestionId)
FROM (SELECT DISTINCT QuestionId FROM PatientChestPain) AS Questions

-- Get header list. A DISTINCT list of Questions
SELECT @HeaderNameCollection= ISNULL(@HeaderNameCollection + ',','') 
       + QUOTENAME(QuestionId) + ' as Q' + CAST(QuestionId AS VARCHAR(16))
FROM (SELECT DISTINCT QuestionId FROM PatientChestPain) AS Questions

SELECT @ColumnNameCollection;
SELECT @HeaderNameCollection;

-- Build PIVOT query using the list of Questions
SET @PivotQuery = 
  N'SELECT PatientId,  ' + @HeaderNameCollection + '
    FROM PatientChestPain
    PIVOT(MAX(PainRank) 
          FOR QuestionId IN (' + @ColumnNameCollection + ')) AS PivotTableResult'
--Execute the PIVOT query

SELECT @PivotQuery;
EXEC sp_executesql @PivotQuery

输出

使用动态 Pivot 时为列名添加前缀

Prefix column names when using dynamic Pivot

sql

pivot

sql-server-2008