如何在unpivot查询中包含id列

Question

我有一个返回此结果的简单查询

TransactionIdentifier  TransactionType   DateTimeStamp
1                      Destruction       Dec 23 2015  7:43AM
2                      Management        May 21 2013  2:01AM

我想将其转换为以下格式

TransactionIdentifier  ColumnName             Value
1                      TransactionIdentifier  1
1                      TransactionType        Destruction                                       
1                      DateTimeStamp          Dec 23 2015  7:43AM
2                      TransactionIdentifier  2
2                      TransactionType        Management                                        
2                      DateTimeStamp          May 21 2013  2:01AM

这是我目前的查询

   SELECT V.ColumnName, V.Value
    FROM (SELECT CONVERT( VARCHAR(4000), TransactionIdentifier) AS TransactionIdentifier,
                 CONVERT( VARCHAR(4000), TransactionType) AS TransactionType,
                 CONVERT( VARCHAR(4000), DateTimeStamp) AS DateTimeStamp
          FROM Transactions
          WHERE TransactionIdentifier IN(1, 2)) AS A1 
         UNPIVOT(Value FOR ColumnName IN(TransactionIdentifier,TransactionType,DateTimeStamp)) AS V

它返回此

ColumnName             Value
TransactionIdentifier  1
TransactionType        Destruction                                       
DateTimeStamp          Dec 23 2015  7:43AM
TransactionIdentifier  2
TransactionType        Management                                        
DateTimeStamp          May 21 2013  2:01AM

如何将TransactionIdentifier字段添加到结果中？

Answer 1

只需从unpivot移除 TransactionIdentifier ，然后将其添加到Select语句

SELECT TransactionIdentifier ,V.ColumnName, V.Value
    FROM (SELECT CONVERT( VARCHAR(4000), TransactionIdentifier) AS TransactionIdentifier,
                 CONVERT( VARCHAR(4000), TransactionType) AS TransactionType,
                 CONVERT( VARCHAR(4000), DateTimeStamp) AS DateTimeStamp
      FROM Transactions
      WHERE TransactionIdentifier IN(1, 2)) AS A1 

     UNPIVOT(Value FOR ColumnName IN(TransactionType,DateTimeStamp)) AS V

输出：

TransactionIdentifier   ColumnName          Value
1                       TransactionType     Destruction
1                       DateTimeStamp       Dec 23 2015  7:43AM
2                       TransactionType     Management
2                       DateTimeStamp       May 21 2013  2:01AM

希望有所帮助。