Question

我们可以将行数转移到多列，即

checkedRows.Cast<DataGridViewRow>().GroupBy(item => item.Cells[Feature Name].Value)
 .Select(group => new { FeatureName = group.Key, Properties = group.Cells["Property Name].Value.ToList() })
 .ToList()

http://sqlfiddle.com/#!6/d4eb9

或任何其他方式。大多数记录（p_id）将具有固定数量的列（自定义名称）标题 - 少数几个，一些没有。非常感谢

Answer 1

试试这个。我建议你自己阅读一些支点，因为它们有点时髦。您可以在此处执行此操作：https://technet.microsoft.com/en-us/library/ms177410(v=sql.105).aspx

您会注意到的一件事是我将所有列合并为单个数据类型（字符串），因为尝试跨多个列进行操作是一场噩梦。如果您仍然需要强制执行数据类型，我会在最终选择中执行此操作。

select 
    p_id,
    DepartmentCode = cast(DepartmentCode as varchar(30)),
    Year = cast(Year as int),
    StartDate = cast(StartDate as datetime),
    EmpId = cast(EmpId as int),
    EmpTitle = cast(EmpTitle as varchar(30))
from (select 
          P_ID,
          custom_name,
          Value = coalesce(text_value, cast(number_value as varchar(30)), convert(varchar(30), datetime, 120))
      from #Temp_Trans) s
pivot(max(Value) for custom_name in (DepartmentCode, Year, StartDate, EmpID,EmpTitle))p

如果由于某种原因你很想转动多个列，你将不得不做多个支点。

Answer 2

两个快速选项：

1）条件聚合

select P_ID
      ,DepartmentCode = max(case when Custom_Name='DepartmentCode' then Text_Value end) 
      ,Year           = max(case when Custom_Name='Year'           then Text_Value end) 
      ,StartDate      = max(case when Custom_Name='StartDate'      then DateTime   end) 
      ,EmpID          = max(case when Custom_Name='EmpID'          then Number_Value end) 
      ,EmpTitle       = max(case when Custom_Name='EmpTitle'       then Text_Value end) 
from #Temp_Trans
Group By P_ID

2）动态数据透视

Declare @SQL varchar(max) 
Select  @SQL = Stuff((Select Distinct ',' + QuoteName(Custom_Name) From #Temp_Trans For XML Path('')),1,1,'')   
Select  @SQL = 'Select P_ID,' + @SQL + ' 
                From (
                       Select P_ID
                             ,ITEM  = Custom_Name
                             ,Value = concat(Text_Value,Number_Value,format(DateTime,''yyyy-MM-dd''))
                       From  #Temp_Trans
                     ) A
                Pivot (max(Value) For Item in (' + @SQL + ') ) p'
Exec(@SQL);

sql将行数转换为多列

2 个答案: