Question

请找到以下屏幕截图，以了解确切的问题。我已经检查了所有与解决方案有关的将列转换为行，但是我的问题有点不同。在这里，我想将列名和列值转换为行值，并将列值转换为行名。我非常感谢解决方案的详细说明。

Answer 1

您可以尝试将条件恶化功能与UNION ALL一起使用

SELECT TYear,
       TMonth,
       'D1' Day,
       MAX(CASE WHEN USER = 'Sam' THEN D1 END) Sam,
       MAX(CASE WHEN USER = 'Rahul' THEN D1 END) Rahul
FROM tblCallAttend
GROUP BY TYear,
         TMonth
UNION ALL
SELECT TYear,
       TMonth,
       'D2' Day,
       MAX(CASE WHEN USER = 'Sam' THEN D2 END) Sam,
       MAX(CASE WHEN USER = 'Rahul' THEN D2 END) Rahul
FROM tblCallAttend
GROUP BY TYear,
         TMonth
SELECT TYear,
       TMonth,
       'D3' Day,
       MAX(CASE WHEN USER = 'Sam' THEN D3 END) Sam,
       MAX(CASE WHEN USER = 'Rahul' THEN D3 END) Rahul
FROM tblCallAttend
GROUP BY TYear,
         TMonth
.....

Answer 2

样本数据

;WITH CTE(Tyear,Tmonth,[User],d1,d2,d3,d4,d5)
AS
(
SELECT 2019,'Jan','Sam',249,297,296,288,269 UNION ALL
SELECT 2019,'Jan','Rahul',300,237,452,142,475
)
SELECT * INTO #Temp FROM CTE

Sql脚本

SELECT [Tyear],Tmonth,Dayz,[Sam],[Rahul] 
FROM
(
SELECT o.Tyear,
       o.Tmonth ,
       Dayz,
       dayval,
       dt.[User]
FROM #Temp o
CROSS APPLY ( VALUES ('d1',d1,[User]),('d2',d2,[User]),('d3',d3,[User]),('d4',d4,[User]),('d5',d5,[User])) 
AS dt (Dayz,dayval,[User]) 
)AS SRc
PIVOT
(
MAX(dayval) FOR [User] IN ([Sam],[Rahul])
)AS Pvt

结果

Tyear   Tmonth  Dayz    Sam  Rahul
----------------------------------
2019    Jan     d1      249  300
2019    Jan     d2      297  237
2019    Jan     d3      296  452
2019    Jan     d4      288  142
2019    Jan     d5      269  475

Answer 3

您要取消数据透视。我为此建议使用横向联接，这在SQL Server中意味着apply关键字：

select ca.tyear, ca.tmonth, v.day,
       (case when ca.user = 'Sam' then v.val end) as Sam,
       (case when ca.user = 'Rahul' then v.val end) as Rahul
from tblCallAttend ca cross apply
     (values ('D1', ca.d1),
             ('D2', ca.d2),
             ('D3', ca.d3),
             ('D4', ca.d4),
             ('D5', ca.d5)
     ) v(day, val)
order by ca.tyear, ca.tmonth, v.day;

横向联接非常强大。取消数据透视等问题是了解它们的便捷方法。

在SQL Server 2008中将列名称和值转换为行名称和行值

3 个答案: