Populating data using a Pivot table - sql

Question

I have a table like this,
country 2007 2008 2009
UK 5 10 20
uk 5 10 20
us 10 30 40
us 10 30 40
But I want to populate the table like this,
country year Total volumn
uk 2007 10
uk 2008 20
uk 2009 40
us 2007 20
us 2008 60
us 2009 80
How do I do this in SQL server 2008 using Pivot table or any other method.
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]
See demo on SQLFiddle

Answer 2

Try the following - and remember to change [DB] with your own database name. In my example you do not need to write the years, but they are extracted automatically for you.
-- 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

Since you are using SQL Server 2008+, then you can use CROSS APPLY to unpivot the data from columns into rows.
You can use the VALUES clause with 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;
See SQL Fiddle with Demo
Or you can use UNION ALL with 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;
See SQL Fiddle with Demo.
This can also be written using a UNION query:
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;
See SQL Fiddle with Demo