CREATE PROCEDURE dbo.spGetMonthCalendar
@Month INT = 1,
@Year INT = 2011
AS BEGIN

DECLARE @StartDate DATE
DECLARE @EndDate DATE

– Create the start date value
SET @StartDate = CONVERT(DATE, RIGHT(’0000′ + CONVERT(VARCHAR, @Year),4) + ‘-’ + RIGHT(’00′ + CONVERT(VARCHAR, @Month), 2) + ‘-01′)
– Create the end date
SET @EndDate = DATEADD(M,1,@StartDate)

;WITH Sales_CTE (MonthDate)
AS
(
Select
@StartDate
UNION ALL
Select DATEADD(dd, 1, MonthDate) as MonthDate
from Sales_CTE
WHERE
DATEADD(dd, 1, MonthDate) < @EndDate
)
select
[1] as sun,
[2] as mon,
[3] as tue,
[4] as wed,
[5] as thu,
[6] as fri,
[7] as sat
FROM
(
select
day(MonthDate) as MONTHDATE,
datepart(weekday, MonthDate) AS DAYOFWEEK,
DATEDIFF(week, DATEADD(MONTH, DATEDIFF(MONTH, 0, MonthDate), 0), MonthDate) +1 as ROW — this correctly determine which week of the month the day falls on (from http://www.berezniker.com/content/pages/sql/microsoft-sql-server/week-number-month)
–row_number() over(order by MonthDate)/7 as ROW –this renders days to the wrong row sometimes
from Sales_CTE
) as source_table
pivot (
sum(monthdate)
for dayofweek in ([1],[2],[3],[4],[5],[6],[7])
) as pivottable
END

Thanks for contributing both great posts to T-SQL Tuesday!