Question

我有一个查询检索所有代理及其模块，结果集将返回每个模块1行。

SELECT
   am.agentID          AS agentid,
   pa.agentDisplayName agentdisplayname,
   m.ModuleName        ModuleName
FROM
   AgentModule AS am
   JOIN primaryagent AS pa
      ON am.agentID = pa.AgentID
   JOIN Module AS m
      ON am.ModuleID = m.ModuleID
WHERE
   m. Active = 1
   AND pa.groupID = 75

数据集返回如下

agentid  |  agentdisplayname  |  modulename
94       |  Agent1            |  Module 1
94       |  Agent1            |  Module 2
94       |  Agent1            |  Module 3
23       |  Agent1            |  Module 2
23       |  Agent1            |  Module 3

我正在尝试使用PIVOT函数返回一个看起来更像

的表

agentid  |  agentdisplayname  |  Module 1  |  Module 2  |  Module 3  |.. .. .. 
94       |  Agent1            |  1         |  1         |  1
23       |  Agent2            |  0         |  1         |  1

有一个动态的模块列表，所以我不能在查询中对它们进行硬编码。我已经尝试过PICOT，但它似乎期望一个聚合函数，并且不太确定它是我需要的场景。

Answer 1

您可以为结果添加额外的列，并在该列上使用min（）。结果将是1或null。使用isnull获取0而不是null。

select agentid,
       agentdisplayname,
       isnull([Module 1], 0) as [Module 1],
       isnull([Module 2], 0) as [Module 2],
       isnull([Module 3], 0) as [Module 3]
from
  (
    select agentid, agentdisplayname, modulename, 1 as dummy
    from YourResultset
  ) as T
pivot
  (min(dummy) for modulename in ([Module 1],[Module 2],[Module 3])) as P

如果要动态构建它，首先需要执行一个返回结果中的模块的查询，然后需要使用它来构建动态语句。最好将查询结果存储在临时表中，然后在构建动态查询时使用该表。

SELECT
   am.agentID          AS agentid,
   pa.agentDisplayName agentdisplayname,
   m.ModuleName        ModuleName
INTO #Tmp
FROM
   AgentModule AS am
   JOIN primaryagent AS pa
      ON am.agentID = pa.AgentID
   JOIN Module AS m
      ON am.ModuleID = m.ModuleID
WHERE
   m. Active = 1
   AND pa.groupID = 75

使用#Tmp构建并运行动态查询。

declare @FieldList1 nvarchar(max)
declare @FieldList2 nvarchar(max)
declare @SQL nvarchar(max)

set @FieldList1 =
  (select ',isnull('+quotename(modulename)+', 0) as '+quotename(modulename)
   from #Tmp
   group by modulename
   order by modulename
   for xml path(''), type).value('.', 'nvarchar(max)')

set @FieldList2 = stuff(
  (select ','+quotename(modulename)
   from #Tmp
   group by modulename
   order by modulename
   for xml path(''), type).value('.', 'nvarchar(max)') , 1, 1, '')

set @SQL = 
  'select agentid, agentdisplayname'+@FieldList1+
  'from (select agentid, agentdisplayname, modulename, 1 as dummy 
         from YourTable) as T 
   pivot (min(dummy) for modulename in ('+@FieldList2+')) as P'

exec sp_executesql @SQL

drop table #Tmp

SQL Server PIVOT函数

1 个答案: