您没有指定您使用的是什么 RDBMS,但如果您使用的是 SQL 服务器,那么您可以同时实现UNPIVOT
和PIVOT
函数。如果您知道要使用多少个值,则可以对这些值进行硬编码:
select *
from
(
select plan_id, value, col+cast(rn as varchar(10)) col
from
(
select plan_id,
cast(rep_id as varchar(12)) rep_id,
rep_nm,
cast(employee_id as varchar(12)) employee_id,
row_number() over(partition by plan_id order by rep_id) rn
from yourtable
) src
unpivot
(
value
for col in (rep_id, rep_nm, employee_id)
) up
) un
pivot
(
max(value)
for col in ([rep_id1], [rep_nm1], [employee_id1],
[rep_id2], [rep_nm2], [employee_id2],
[rep_id3], [rep_nm3], [employee_id3],
[rep_id4], [rep_nm4], [employee_id4])
) piv
请参阅带有演示的 SQL Fiddle
但是如果你有一个未知数量的值,那么你可以使用类似于这样的动态 SQL:
DECLARE @colsUnpivot AS NVARCHAR(MAX),
@query AS NVARCHAR(MAX),
@colsPivot as NVARCHAR(MAX)
select @colsUnpivot = stuff((select ','+quotename(C.name)
from sys.columns as C
where C.object_id = object_id('yourtable') and
C.name not in ('plan_id', 'Rep_id', 'Row_id')
for xml path('')), 1, 1, '')
select @colsPivot = STUFF((SELECT ','
+ quotename(c.name
+ cast(t.rn as varchar(10)))
from
(
select row_number() over(partition by plan_id order by rep_id) rn
from yourtable
) t
cross apply sys.columns as C
where C.object_id = object_id('yourtable') and
C.name not in ('plan_id', 'Rep_id', 'Row_id')
group by c.name, t.rn
order by t.rn
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query
= 'select *
from
(
select plan_id, value, col+cast(rn as varchar(10)) col
from
(
select plan_id,
cast(rep_id as varchar(12)) rep_id,
rep_nm,
cast(employee_id as varchar(12)) employee_id,
row_number() over(partition by plan_id order by rep_id) rn
from yourtable
) x
unpivot
(
value
for col in ('+ @colsunpivot +')
) u
) src
pivot
(
max(value)
for col in ('+ @colspivot +')
) p'
exec(@query)
请参阅带有演示的 SQL Fiddle
两者都会产生相同的结果:
| PLAN_ID | EMPLOYEE_ID1 | REP_NM1 | EMPLOYEE_ID2 | REP_NM2 | EMPLOYEE_ID3 | REP_NM3 | EMPLOYEE_ID4 | REP_NM4 |
------------------------------------------------------------------------------------------------------------------------------
| 6719 | 168 | Barbara Wax | (null) | (null) | (null) | (null) | (null) | (null) |
| 6720 | 160 | Robert Jones | 23 | Pam Smith | 85 | Erik Johnson | 212 | Sally Ells |