具有多个聚合值的数据透视 table

Question

我正试图在 table 以下进行调整，这可能吗？

但如果我按代码聚合它们，值 A 或 B 将因此消失。

来自

Name	Code	Value
Kevin	Code1	A
Kevin	Code1	B
Kevin	Code2	C
Kevin	Code3	D
Tom	Code1	E
Tom	Code2	F
Tom	Code3	G

到

Name	Code1	Code2	Code3
Kevin	A	C	D
Kevin	B	C	D
Tom	E	F	G

查询我试过了....

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

select @cols = STUFF((SELECT distinct ',' + QUOTENAME(c.Code) 
FROM Table c
    FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(max)'),1,1,'')

set @query = 'with mapping as 
             (SELECT 
                Name
                , ' + @cols + ' 
             from (select name
                       , Code
                       , Value
                    from Table) x
             pivot 
             (max(Code)
             for Name in (' + @cols + ')) p )' 

execute(@query)

自己试过，但只能达到以下水平

Name	Code1	Code2	Code3
Kevin	A or B(depend on aggregated max or min)	C	D
Tom	E	F	G

提前致谢

Answer 1

这是一个固定的列列表版本。您应该使用此模板构建您的动态模板。

select Name 
  , first_value(Code1) over(partition by Name order by rn) Code1
  , first_value(Code2) over(partition by Name order by rn) Code2
  , first_value(Code3) over(partition by Name order by rn) Code3
from (
   select t.* , row_number() over(partition by Name, Code order by Value) rn
   from tbl t
   ) t
pivot (max(value) for code in (Code1, Code2, Code3)) p
order by Name;

Answer 2

使用row_number()和一些算术：

select name,
       max(case when code = 'Code1' then value end) as code1,
       max(case when code = 'Code2' then value end) as code2,
       max(case when code = 'Code3' then value end) as code3
from (select t.*,
             row_number() over (partition by name, code order by (select null)) as seqnum
      from t
     ) t
group by name, seqnum;

不清楚动态 SQL 是由于动态列数还是试图解决此问题。但这也可以适用于动态 SQL。

具有多个聚合值的数据透视 table

Pivot table with multiple aggregate value

sql

tsql

sql-server

pivot