使用數據透視表

Question

我有一個這樣的表填充數據，

country 2007 2008 2009 
UK  5  10  20 
uk  5  10  20 
us  10  30  40 
us  10  30  40 

但我想填充這樣的表，

country year Total volumn 
uk  2007 10 
uk  2008 20 
uk  2009 40 
us  2007 20 
us  2008 60 
us  2009 80 

如何使用我做這在SQL Server 2008數據透視表或任何其他方法。

http://sqlfiddle.com/#!3/2499a

Answer 1

SELECT country, [year], SUM([Total volumn]) AS [Total volumn] 
FROM (
     SELECT country, [2007], [2008], [2009] 
     FROM dbo.test137 
    ) p 
UNPIVOT 
([Total volumn] FOR [year] IN ([2007], [2008], [2009]) 
) AS unpvt 
GROUP BY country, [year] 
ORDER BY country, [year] 

觀看演示上SQLFiddle

Answer 2

請嘗試以下 - 記得要改變[DB]用自己的數據庫名稱。在我的例子中，你不需要寫年，但是它們會自動爲你提取。

-- will contain the temporary total 
create table #tempResult (total int) 

-- get all countries 
declare @countries table (country varchar(50)) 
insert into @countries 
select country from table1 

-- get all years 
declare @years table(id int identity(1,1), [year] int) 
insert into @years 
SELECT column_name 
FROM [DB].INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_NAME = N'Table1' 
and column_name != 'country' 

-- get all combinations 
declare @result table(id int identity(1,1),country varchar(50),[year] int,total int) 
insert into @result 
select distinct upper(c.country),y.[year],0 
from @years as y,@countries as c 

-- will be used for the looping 
declare @counter int 
select @counter = 1 

while @counter <= (select count(*) from @result) 
begin 

declare @year int 
declare @country varchar(50) 

-- get year and country in question 
select @year = [year] from @result where id = @counter 
select @country = country from @result where id = @counter 

declare @total int 
select @total = (select sum(@year) from table1 where country = @country) 

-- insert temp result 
declare @sql nvarchar(max) 
set @sql = N'insert into #tempResult select sum([' + cast(@year as varchar(50)) + ']) from table1 where country = ''' + @country + '''' 
print @sql 

exec (@sql) 

-- extract 
select top 1 @total = total from #tempResult 

-- update respectively 
update @result set total = @total 
where country=@country and [year]=@year 

-- clear 
delete from #tempResult 

select @counter = @counter + 1 
end 

-- select result 
select * From @result 

drop table #tempResult 

Answer 3

由於您使用的是SQL Server 2008+，因此您可以使用CROSS APPLY將列中的數據反轉爲行。

您可以使用VALUES子句與CROSS APPLY：

select distinct t.country, 
    c.year, 
    c.totalvolumn 
from yourtable t 
cross apply 
(
    values 
    ('2007', 2007), 
    ('2008', 2008), 
    ('2009', 2009) 
) c(year, TotalVolumn) 
order by t.country, c.year; 

見SQL Fiddle with Demo

或者你可以使用UNION ALL與CROSS APPLY：

select distinct t.country, 
    c.year, 
    c.totalvolumn 
from yourtable t 
cross apply 
(
    select '2007', 2007 union all 
    select '2008', 2008 union all 
    select '2009', 2009 
) c(year, TotalVolumn) 
order by t.country, c.year; 

見SQL Fiddle with Demo。

這也可以使用UNION查詢寫着：

select country, '2007' year, 2007 totalVolumn 
from yourtable 
union 
select country, '2008' year, 2008 totalVolumn 
from yourtable 
union 
select country, '2009' year, 2009 totalVolumn 
from yourtable 
order by country, year; 

見SQL Fiddle with Demo