Sql server SQL Pivot如何用于矩阵视图和多表

问题：我有两个表，如下所示，我想从中查看矩阵

WorkflowStatus（状态编号可由用户定义）

工作流矩阵

问题：如何在SQL中使用Pivot命令查看结果，如下所示

                |  Draft  | Submitted  |  Approved |  Rejected |  Closed
   =========================================================================
    1 Draft     |         |  true      |  true     |           |
    2 Submitted |         |            |  true     |   true    |
    3 Approved  |         |            |           |           |   true
    4 Rejected  |         |  true      |           |           |
    5 Closed    |         |            |           |           |

---

非常感谢您的帮助。

这是一个令人困惑的问题

SELECT id, 
       NAME, 
       Max(CASE WHEN nextstatus = 1 THEN 'True' ELSE '' END) [Draft], 
       Max(CASE WHEN nextstatus = 2 THEN 'True' ELSE '' END) [Submitted], 
       Max(CASE WHEN nextstatus = 3 THEN 'True' ELSE '' END) [Approved], 
       Max(CASE WHEN nextstatus = 4 THEN 'True' ELSE '' END) [Rejected], 
       Max(CASE WHEN nextstatus = 5 THEN 'True' ELSE '' END) [Closed] 
FROM   WorkflowStatus  a 
       LEFT JOIN WorkflowMatrix b 
              ON a.id = b.oldstatus 
GROUP  BY id, 
          NAME 
ORDER  BY id 

---

这是一个令人困惑的支点

SELECT id, 
       NAME, 
       Max(CASE WHEN nextstatus = 1 THEN 'True' ELSE '' END) [Draft], 
       Max(CASE WHEN nextstatus = 2 THEN 'True' ELSE '' END) [Submitted], 
       Max(CASE WHEN nextstatus = 3 THEN 'True' ELSE '' END) [Approved], 
       Max(CASE WHEN nextstatus = 4 THEN 'True' ELSE '' END) [Rejected], 
       Max(CASE WHEN nextstatus = 5 THEN 'True' ELSE '' END) [Closed] 
FROM   WorkflowStatus  a 
       LEFT JOIN WorkflowMatrix b 
              ON a.id = b.oldstatus 
GROUP  BY id, 
          NAME 
ORDER  BY id 

---

您可以尝试此操作，但在数据透视表上使用GROUP BY时仍然遇到问题

DECLARE @cols AS NVARCHAR(MAX),
  @query  AS NVARCHAR(MAX);

select @cols = STUFF((SELECT ',' + QUOTENAME(id) 
                from #WorkflowStatus 
                group by id, Name
                order by id
        FOR XML PATH(''), TYPE
        ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'');
 
set @query = '
WITH Pivoted
AS
(
SELECT OldStatus, '+ @cols +' FROM
         #WorkflowStatus  a
         LEFT JOIN #WorkflowMatrix b 
          ON a.id = b.NextStatus
        PIVOT
        (
            COUNT(NextStatus)
            for NextStatus in (' + @cols + ')
        ) p
)    
SELECT OldStatus,'+@cols+'
FROM Pivoted a
WHERE OldStatus IS NOT NULL
GROUP BY OldStatus,'+ @cols +'
ORDER BY OldStatus ASC
';

exec sp_executesql @query;

我希望我能帮忙。

---

以下是

您可以尝试此操作，但在数据透视表上使用GROUP BY时，我仍然遇到问题

DECLARE @cols AS NVARCHAR(MAX),
  @query  AS NVARCHAR(MAX);

select @cols = STUFF((SELECT ',' + QUOTENAME(id) 
                from #WorkflowStatus 
                group by id, Name
                order by id
        FOR XML PATH(''), TYPE
        ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'');
 
set @query = '
WITH Pivoted
AS
(
SELECT OldStatus, '+ @cols +' FROM
         #WorkflowStatus  a
         LEFT JOIN #WorkflowMatrix b 
          ON a.id = b.NextStatus
        PIVOT
        (
            COUNT(NextStatus)
            for NextStatus in (' + @cols + ')
        ) p
)    
SELECT OldStatus,'+@cols+'
FROM Pivoted a
WHERE OldStatus IS NOT NULL
GROUP BY OldStatus,'+ @cols +'
ORDER BY OldStatus ASC
';

exec sp_executesql @query;

我希望我能帮忙。

---

这是

谢谢。但在WorkflowStatus表中，状态的数量不是固定的。如果列是以编程方式生成的，那就更好了。但在WorkflowStatus表中，状态的数量不是固定的。如果列是以编程方式生成的，那就更好了。但在WorkflowStatus表中，状态的数量不是固定的。最好是以编程方式生成列。我不知道如何使用Pivot在这种情况下，我会使用动态查询，并将查询构建为Prdp的答案谢谢。但在WorkflowStatus表中，状态的数量不是固定的。最好是以编程方式生成列。我不知道如何使用Pivot在这种情况下，我会使用一个动态查询，并构建一个看起来像Prdp答案的查询

DECLARE @cols AS NVARCHAR(MAX),
  @query  AS NVARCHAR(MAX);

select @cols = STUFF((SELECT ',' + QUOTENAME(id) 
                from #WorkflowStatus 
                group by id, Name
                order by id
        FOR XML PATH(''), TYPE
        ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'');
 
set @query = '
WITH Pivoted
AS
(
SELECT OldStatus, '+ @cols +' FROM
         #WorkflowStatus  a
         LEFT JOIN #WorkflowMatrix b 
          ON a.id = b.NextStatus
        PIVOT
        (
            COUNT(NextStatus)
            for NextStatus in (' + @cols + ')
        ) p
)    
SELECT OldStatus,'+@cols+'
FROM Pivoted a
WHERE OldStatus IS NOT NULL
GROUP BY OldStatus,'+ @cols +'
ORDER BY OldStatus ASC
';

exec sp_executesql @query;