SQL SERVER 2008的轉置函式PIVOT

pivot函式用於轉置資料，即用旋轉表的方式把行換成列。pivot可以將表中的列換成行

如下面的例子：

create

table
sales.salesbymonth
(    
year
char(4
),    
month
char(3
),    amount 
money
,    
primary
key(year,month))
insert
into sales.salesbymonth(year,month
,amount)
values('
2007
','jan
',789.0000
),      (
'2007
','feb
',389.0000
),      (
'2007
','mar
',8867.0000
),      (
'2007
','apr
',778.0000
),      (
'2007
','may
',78.0000
),      (
'2007
','jun
',9.0000
),      (
'2007
','jul
',987.0000
),      (
'2007
','aug
',866.0000
),      (
'2007
','sep
',7787.0000
),      (
'2007
','oct
',85576.0000
),      (
'2007
','nov
',855.0000
),      (
'2007
','dec
',5875.0000
),      
('2008
','jan
',7.0000
),      (
'2008
','feb
',6868.0000
),      (
'2008
','mar
',688.0000
),      (
'2008
','apr
',9897.0000
)      
select
year
,       
sum(case
when
month='
jan'
then amount else
0end) as
'jan',
sum(case
when
month='
feb'
then amount else
0end) as
'feb',
sum(case
when
month='
mar'
then amount else
0end) as
'mar',
sum(case
when
month='
apr'
then amount else
0end) as
'apr',
sum(case
when
month='
may'
then amount else
0end) as
'may',
sum(case
when
month='
jun'
then amount else
0end) as
'jun',
sum(case
when
month='
jul'
then amount else
0end) as
'jul',
sum(case
when
month='
aug'
then amount else
0end) as
'aug',
sum(case
when
month='
sep'
then amount else
0end) as
'sep',
sum(case
when
month='
oct'
then amount else
0end) as
'oct',
sum(case
when
month='
nov'
then amount else
0end) as
'nov',
sum(case
when
month='
dec'
then amount else
0end) as
'dec
'from
sales.salesbymonth 
group
byyear
select
year,[
jan],[
feb],[
mar],[
apr],[
may],[
jun]
,            
[jul
],[aug
],[sep
],[oct
],[nov
],[dec
]from
(select
year,amount,month
from sales.salesbymonth) as
salesbymonth 
pivot (
sum(amount) for
monthin(
[jan
],[feb
],[mar
],[apr
],[may
],[jun],
[jul
],[aug
],[sep
],[oct
],[nov
],[dec
])) 
asourpivot
order
byyear

如果去掉year選項，語句改為：

select

[jan
],[feb
],[mar
],[apr
],[may
],[jun],
[jul
],[aug
],[sep
],[oct
],[nov
],[dec
]from
(select amount,month
from sales.salesbymonth) as
salesbymonth 
pivot (
sum(amount) for
monthin(
[jan
],[feb
],[mar
],[apr
],[may
],[jun],
[jul
],[aug
],[sep
],[oct
],[nov
],[dec
])) 
as ourpivot

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