• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 139
  • Last Modified:

Sql Server 2008R2 Select statement to group by weeks showing Mondays dates

I need a simple select statement to group data by week, showing Mondays Date for the groupings.

i.e. I want to group 7 days of data into the beginning of the week date.

20141222   sum
20141229   sum
20150105   sum
20150112   sum
0
BFanguy
Asked:
BFanguy
  • 2
1 Solution
 
BFanguyAuthor Commented:
think i answered my own question:
CASE datepart(weekday, ShiftDate) 
                      WHEN 1 THEN (CONVERT(varchar(8), DATEADD(day, - 6, ShiftDate), 112)) WHEN 2 THEN (CONVERT(varchar(8), ShiftDate, 112)) WHEN 3 THEN (CONVERT(varchar(8), 
                      DATEADD(day, - 1, ShiftDate), 112)) WHEN 4 THEN (CONVERT(varchar(8), DATEADD(day, - 2, ShiftDate), 112)) WHEN 5 THEN (CONVERT(varchar(8), DATEADD(day, - 3, 
                      ShiftDate), 112)) WHEN 6 THEN (CONVERT(varchar(8), DATEADD(day, - 4, ShiftDate), 112)) WHEN 7 THEN (CONVERT(varchar(8), DATEADD(day, - 5, ShiftDate), 112)) 
                      END AS Starting_Weekday

Open in new window

0
 
Scott PletcherSenior DBACommented:
Below is a much easier way to get the correct date, including stripping the time (if needed).

You can add a CROSS APPLY to assign an alias to that name you can use through the query:

SELECT
    CONVERT(varchar(8), Monday_Date, 112) AS Monday_Date,
    SUM(...)
FROM dbo.table_name
CROSS APPLY (
    SELECT DATEADD(DAY, DATEDIFF(DAY, 0, ShiftDate), 0) AS ShiftDate_Time_Stripped
) AS assign_alias_names1
CROSS APPLY (
    SELECT DATEADD(DAY, -DATEDIFF(DAY, 0, ShiftDate_Time_Stripped) % 7, ShiftDate_Time_Stripped) AS Monday_Date
) AS assign_alias_names2
GROUP BY Monday_Date
ORDER BY Monday_Date
0
 
BFanguyAuthor Commented:
Thank you sir.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Cloud Class® Course: CompTIA Healthcare IT Tech

This course will help prep you to earn the CompTIA Healthcare IT Technician certification showing that you have the knowledge and skills needed to succeed in installing, managing, and troubleshooting IT systems in medical and clinical settings.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now