使用枢轴将行分成列

Question

你能帮我解决这个错误吗

“nvrchildgender”列的类型与 UNPIVOT 列表中指定的其他列的类型冲突。

表结构：

CREATE TABLE [dbo].[tblHRIS_ChildDetails](
    [intCHID] [int],
    [intSID] [int] NOT NULL,
    [nvrChildname] [nvarchar](250) NULL,
    [nvrChildGender] [nvarchar](50) NULL,
    [dttChildDOB] [datetime] NULL,
    [nvrnominee] [nvarchar](50) NULL,
    [nvrChildOccupation] [nvarchar](250) NULL,
    [dttCreatedon] [datetime] NULL,
    [dttModifiedOn] [datetime] NULL,
    [nvrModifiedby] [nvarchar](50) NULL
) ON [PRIMARY]

查询：

select *
from
(
  select value, col+'_'+cast(rn as varchar(10)) col
  from
  (
    select nvrchildname,
      nvrchildgender,
      convert(nvarchar(10), dttchildDOB, 120) dttchildDOB,
      nvrchildoccupation,
      row_number() over(partition by intsid order by intCHID) rn
    from tblHRIS_ChildDetails
    where intsid = 463
  ) src
  unpivot
  (
    value 
    for col in (nvrchildname, nvrchildgender, dttchildDOB,  nvrchildoccupation)
  ) unpiv
) src1
pivot
(
  max(value)
  for col in ([nvrchildname_1], [nvrgender_1], 
              [dttchildDOB_1], [occupation_1], 
              [nvrchildname_2], [nvrgender_2], 
              [dttchildDOB_2], [occupation_2]) 
) piv

我无法运行此查询，我认为请解决一些演员问题。

Sql fiddle

Answer 1

要成功 UNPIVOT，列类型必须匹配。由于 4 列中的两列已经是 nvarchar(250)，而另外两列更短，因此将它们提升为 nvarchar(250) 是最方便的解决方法。

select *
from
(
  select value, col+'_'+cast(rn as varchar(10)) col
  from
  (
    select nvrchildname,
      cast(nvrchildgender as nvarchar(250)) nvrgender,
      convert(nvarchar(250), dttchildDOB, 120) dttchildDOB,
      nvrchildoccupation occupation,
      row_number() over(partition by intsid order by intCHID) rn
    from tblHRIS_ChildDetails
    where intsid = 463
  ) src
  unpivot
  (
    value 
    for col in (nvrchildname, nvrgender, dttchildDOB, occupation)
  ) unpiv
) src1
pivot
(
  max(value)
  for col in ([nvrchildname_1], [nvrgender_1], 
              [dttchildDOB_1], [occupation_1], 
              [nvrchildname_2], [nvrgender_2], 
              [dttchildDOB_2], [occupation_2]) 
) piv

注意：您已将 PIVOT 列命名为 nvrgender，但基列是 nvrchildgender。同样的问题是，pivot 和 unpivot 之间的 occupation 列命名不匹配。

Answer 2

UNPIVOT 列表中的列：

nvrchildname, nvrchildgender, dttchildDOB,  nvrchildoccupation

有不同的数据类型。

您必须确保列的类型。类似的东西：

 ...
  CAST(nvrchildname AS NVARCHAR(10)) nvrchildname,
  CAST(nvrchildgender AS NVARCHAR(10)) nvrchildgender,
  convert(nvarchar(10), dttchildDOB, 120) dttchildDOB,
  CAST (nvrchildoccupation AS NVARCHAR(10)) nvrchildoccupation
 ...

Updated SQL Fiddle Demo