行列转换
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--drop table RowToCol
create
table
RowToCol
(
ID
int
,
Code
varchar
(10),
Value
int
)
Go
insert
RowToCol
select
1,
'Item1'
,1000
union
all
select
1,
'Item2'
,1000
union
all
select
1,
'Item3'
,500
union
all
select
2,
'Item1'
,2000
union
all
select
2,
'Item2'
,0
union
all
select
3,
'Item1'
,1000
union
all
select
3,
'Item3'
,500
GO
select
*
from
RowToCol
|
| ID | Item1 | Item2 | Item3 |
| 1 | 1000 | 1000 | 500 |
| 2 | 2000 | 0 | 0 |
| 3 | 1000 | 0 | 500 |
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select
ID,
sum
(
case
Code
when
'Item1'
then
Value
else
0
end
)
as
Item1,
sum
(
case
Code
when
'Item2'
then
Value
else
0
end
)
as
Item2,
sum
(
case
Code
when
'Item3'
then
Value
else
0
end
)
as
Item3
from
RowToCol
group
by
ID
--或者用max也行
select
ID,
max
(
case
Code
when
'Item1'
then
Value
else
0
end
)
as
Item1,
max
(
case
Code
when
'Item2'
then
Value
else
0
end
)
as
Item2,
max
(
case
Code
when
'Item3'
then
Value
else
0
end
)
as
Item3
from
RowToCol
group
by
ID
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declare
@sql
varchar
(8000)
set
@sql =
'select ID '
select
@sql = @sql +
' , max(case Code when '
''
+ Code +
''
' then Value else 0 end) ['
+ Code +
']'
from
(
select
distinct
Code
from
RowToCol)
as
a
set
@sql = @sql +
' from RowToCol group by ID'
--print @sql
exec
(@sql)
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select
*
from
(
select
*
from
RowToCol) a
pivot (
max
(value)
for
Code
in
([Item1],[Item2],[Item3])) b
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declare
@sql
varchar
(8000)
select
@sql =
isnull
(@sql +
'],['
,
''
) + Code
from
RowToCol
group
by
Code
set
@sql =
'['
+ @sql +
']'
--print @sql
exec
(
'select * from (select * from RowToCol) a pivot (max(value) for Code in ('
+ @sql +
')) b'
)
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--drop table ColToRow
create
table
ColToRow
(
ID
int
,
Item1
int
,
Item2
int
,
Item3
int
)
GO
insert
into
ColToRow
select
'1'
,1000,1000,500
union
all
select
'2'
,2000,0,0
union
all
select
'3'
,1000,0,500
GO
select
*
from
ColToRow
|
| ID | Code | Value |
| 1 | Item1 |
1000 |
| 1 | Item2 | 1000 |
| 1 | Item3 | 500 |
| 2 | Item1 | 2000 |
| 2 | Item2 | 0 |
| 2 | Item3 | 0 |
| 3 | Item1 | 1000 |
| 3 | Item2 | 0 |
| 3 | Item3 | 500 |
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select
ID,Code=
'Item1'
,Value=Item1
from
ColToRow
union
all
select
ID,Code=
'Item2'
,Value=Item2
from
ColToRow
union
all
select
ID,Code=
'Item3'
,Value=Item3
from
ColToRow
order
by
ID
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declare
@sql
varchar
(8000)
select
@sql =
isnull
(@sql +
' union all '
,
''
) +
' select ID , [Code] = '
+ quotename(
Name
,
''
''
) +
' , [Value] = '
+ quotename(
Name
) +
' from ColToRow'
from
syscolumns
where
name
<> N
'ID'
and
ID = object_id(
'ColToRow'
)
order
by
colid
asc
--print @sql
exec
(@sql +
' order by ID '
)
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select
ID , Code , Value
from
ColToRow
unpivot (Value
for
Code
in
([Item1] , [Item2] , [Item3])) t
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declare
@sql
varchar
(8000)
select
@sql =
isnull
(@sql +
'],['
,
''
) +
name
from
syscolumns
where
name
<> N
'ID'
and
ID = object_id(
'ColToRow'
)
set
@sql =
'['
+ @sql +
']'
--print @sql
exec
(
'select ID , Code , Value from ColToRow unpivot (Value for Code in('
+ @sql +
')) t'
)
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