Using case to create multiple columns of data - sql

Question

I am trying to create a query in MS SQL 2005 that will return data for 4 date ranges as separate columns in my results set.
Right now my query looks like the query below. It works fine, however I want to add the additional columns for each date range since it currently supports one date range when.
This would then return a total1,total2, total3 and total 4 column instead of a single total column like the current query below. Each total would represent the 4 date ranges:
I am fairly sure this can be accomplished using case statements, but am not 100%.
Any help would be certainly appreciated.
SELECT
vendor,location,
sum(ExtPrice) as total
FROM [database].[dbo].[saledata]
where processdate between '2010-11-03' and '2010-12-14'
and location <>''
and vendor <> ''
group by vendor,location with rollup

Answer 1

I usually do it like this:
SELECT
vendor,location,
sum(CASE WHEN processdate BETWEEN #date1start AND #date1end THEN xtPrice ELSE 0 END) as total,
sum(CASE WHEN processdate BETWEEN #date2start AND #date2end THEN xtPrice ELSE 0 END) as total2,
sum(CASE WHEN processdate BETWEEN #date3start AND #date3end THEN xtPrice ELSE 0 END) as total3,
sum(CASE WHEN processdate BETWEEN #date4start AND #date4end THEN xtPrice ELSE 0 END) as total4
FROM [database].[dbo].[saledata]
and location <>''
and vendor <> ''
group by vendor,location with rollup
And you can change the WHEN portion to make your desired date ranges.

Answer 2

Use Subqueries, ie
select sd.vendor, sd.location, sd1.total, sd2.total, sd3.total, sd4.total
from (select distinct vendor, location from saledata) AS sd
LEFT JOIN (
SELECT vendor,location, sum(ExtPrice) as total
FROM [database].[dbo].[saledata]
where processdate between 'startdate1' and 'enddate1'
and location <>''
and vendor <> ''
group by vendor,location with rollup) sd1 on sd1.vendor=sd.vendor and sd1.location=sd.location
LEFT JOIN (
SELECT vendor,location, sum(ExtPrice) as total
FROM [database].[dbo].[saledata]
where processdate between 'startdate2' and 'enddate2'
and location <>''
and vendor <> ''
group by vendor,location with rollup) sd2 on sd2.vendor=sd.vendor and sd2.location=sd.location
LEFT JOIN (
SELECT vendor,location, sum(ExtPrice) as total
FROM [database].[dbo].[saledata]
where processdate between 'startdate3' and 'enddate3'
and location <>''
and vendor <> ''
group by vendor,location with rollup) sd3 on sd3.vendor=sd.vendor and sd3.location=sd.location
LEFT JOIN (
SELECT vendor,location, sum(ExtPrice) as total
FROM [database].[dbo].[saledata]
where processdate between 'startdate4' and 'enddate4'
and location <>''
and vendor <> ''
group by vendor,location with rollup) sd4 on sd4.vendor=sd.vendor and sd4.location=sd.location