I need help displaying a field that is zero - sql

Question

In this query I'm counting work orders that were created the previous week and displaying a count by wotype2. If a wotype2 for the previous week is zero, I need the wotype2 to appear in my results. Any ideas on how to pull this off?
-- Retrieve Last Week's New Work Orders.
DECLARE #TodayDayOfWeek INT
DECLARE #EndOfPrevWeek DateTime
DECLARE #StartOfPrevWeek DateTime
--get number of a current day (1-Monday, 2-Tuesday... 7-Sunday)
SET #TodayDayOfWeek = datepart(dw, GetDate())
--get the last day of the previous week (last Sunday)
SET #EndOfPrevWeek = DATEADD(dd, -#TodayDayOfWeek, GetDate())
--get the first day of the previous week (the Monday before last)
SET #StartOfPrevWeek = DATEADD(dd, -(#TodayDayOfWeek+6), GetDate())
SELECT wotype2 as WOType, COUNT(*) as NewWOsLastWeek
FROM tasks
WHERE ((OpenDATE BETWEEN
CONVERT(VARCHAR, #StartOfPrevWeek,7) AND
CONVERT(VARCHAR, #EndOfPrevWeek+1,7)) AND
(TYPE = 'Information Systems') AND
(RESPONS != 'ADMIN'))
group by wotype2
order by wotype2

Answer 1

You may need to do an outer join (say a left outer join) with a table which has all the possible values of wotype2.
If there is such a table, let's say it's named wotype2s, then the SQL would be:
SELECT wotype2s.wotype2 as WOType, COUNT(*) as NewWOsLastWeek
FROM wotype2s left outer join tasks on wotype2s.wotype2 = tasks.wotype2
WHERE ((OpenDATE BETWEEN
CONVERT(VARCHAR, #StartOfPrevWeek,7) AND
CONVERT(VARCHAR, #EndOfPrevWeek+1,7)) AND
(TYPE = 'Information Systems') AND
(RESPONS != 'ADMIN'))
group by wotype2s.wotype2
order by wotype2s.wotype2
or, if there is no such table,
SELECT wotype2s.wotype2 as WOType, COUNT(*) as NewWOsLastWeek
FROM (select distinct wotype2 from tasks) wotype2s
left outer join tasks on wotype2s.wotype2 = tasks.wotype2
WHERE ((OpenDATE BETWEEN
CONVERT(VARCHAR, #StartOfPrevWeek,7) AND
CONVERT(VARCHAR, #EndOfPrevWeek+1,7)) AND
(TYPE = 'Information Systems') AND
(RESPONS != 'ADMIN'))
group by wotype2s.wotype2
order by wotype2s.wotype2