Question

有没有办法在PIVOTED列中有一个CASE SELECT语句。我的代码如下

SELECT PName, [RN], [HA], [LVN], [MSW], [SC] 
FROM 
(
   Query

 ) src 

  pivot
    (
     max(Visits)
    for Discipline in ([RN], [HA], [LVN], [MSW], [SC])
    ) piv

我得到的输出如下

   Pname        RN         HA          LVN        MSW        SC
    AA        AG-2/W    LO-1/W       NA-1/W     SK-2/W     NO-2/MON
    AA        JL-2/W     NULL         NULL        NULL       NULL

因为已经为2个PN分配了2个RN，所以我想仅在1行中汇总结果，并且只选择1个值显示在RN列中，以便根据我的条件得出结果如下。

    Pname        RN         HA          LVN        MSW        SC
    AA        JL-2/W    LO-1/W       NA-1/W     SK-2/W     NO-2/MON

Answer 1

如果没有看到完整的查询，您应该能够将row_number应用于内部查询，然后使用类似于此的WHERE子句：

SELECT PName, [RN], [HA], [LVN], [MSW], [SC] 
FROM 
(
   <yourQuery>, row_number() over(order by somefield) rn -- add a rownumber here
 ) src 
pivot
(
    max(Visits)
    for Discipline in ([RN], [HA], [LVN], [MSW], [SC])
) piv
where rn = 1

如果您发布完整查询，可能还有其他方法可以执行此操作。

使用上一个问题中的信息进行编辑，您的查询将如下所示：

select patname, [HA], [MSW], [RN]
from 
(
  select patName, Disc,
    sname+' '+schedule new_value,
    row_number() over(partition by patname, disc order by disc) rowNum
  from yourquery
) src
pivot
(
  max(new_value)
  for disc in ([HA], [MSW], [RN])
) piv
where rownum = 1

请参阅SQL Fiddle with Demo

或者您可以使用：

select *
from 
(
    SELECT PName, [RN], [HA], [LVN], [MSW], [SC] , row_number() over(partition by PName order by PName) rn
    FROM 
    (
       <yourQuery>
     ) src 
    pivot
    (
        max(Visits)
        for Discipline in ([RN], [HA], [LVN], [MSW], [SC])
    ) piv
) x
where rn = 1

Answer 2

您必须在旋转之后删除数据，因为[RN]本身受MAX条件限制，即它本身就是一个枢轴列。将其包装在CTE中，应用RowNumber（）函数并正确分区，然后对每个分区仅过滤一行。

;WITH CTE AS (
    SELECT PName, [RN], [HA], [LVN], [MSW], [SC],
           ROW_NUMBER() OVER (partition by PName order by [RN] ASC) RowNum
    FROM 
    (
       Query

     ) src 

      pivot
        (
         max(Visits)
        for Discipline in ([RN], [HA], [LVN], [MSW], [SC])
        ) piv
)
SELECT *
  FROM CTE
 WHERE RowNum = 1;

选择In PIVOT

2 个答案: