Adding a summary column in a table which contains the start and end dates in the week

Question

Hi,
I've got a DIMENSION DATE table and want to add in another column which shows the start and end date of the week.
See below, the new column is WEEKOFYEARTEXT.
Does anybody know how i may generate this column using SQL and using the existing columns?
Umar Javed

Answer 1

See:  http://www.sqlusa.com/bestpractices/datetimeconversion/
DECLARE @Year INT = '2015';
WITH cteDays AS (SELECT DayOfYear=Dateadd(dd, number,
CONVERT(DATE, CONVERT(char(4),@Year)+'0101'))
FROM master.dbo.spt_values WHERE type='P'),
CTE AS (SELECT DayOfYear, WeekOfYear=DATEPART(week,DayOfYear)
FROM cteDays WHERE YEAR(DayOfYear)= @YEAR)
SELECT WeekOfYear, StartOfWeek=MIN(DayOfYear), EndOfWeek=MAX(DayOfYear)
FROM CTE GROUP BY WeekOfYear ORDER BY WeekOfYear;
WeekOfYear StartOfWeek EndOfWeek
1 2015-01-01 2015-01-03
2 2015-01-04 2015-01-10
3 2015-01-11 2015-01-17
4 2015-01-18 2015-01-24
5 2015-01-25 2015-01-31
6 2015-02-01 2015-02-07
7 2015-02-08 2015-02-14
8 2015-02-15 2015-02-21
Kalman Toth Database & OLAP Architect
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