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Query to find the start day of the week as Monday Expand / Collapse
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var05
Posted Tuesday, December 04, 2012 7:55 AM
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Hi All,

How to specify the start day of the week as Monday for the below records

I have tow fields Record and Load date... Want to have another additional Col start date of the week

Results as below:
Record Loaddate Start date of the week (As Monday)

A 03/12/2012 03/12/2012
B 04/12/2012 03/12/2012
C 05/12/2012 03/12/2012
D 09/12/2012 03/12/2012


I used the below query

select CONVERT(varchar(10), DATEADD(WK, DATEDIFF(WK, 0, '12/04/2012'), 0),101) AS Week

The above query works fine and fetches the start day of the week As monday only if the day is between Monday - Saturday.

But say for Sunday '12/09/2012', the start day of the week is considered as the subsequent Monday 12/10/2012... But for the Sunday 12/09/2012, I wanted the start date of the week as '12/03/2012'

Any help on this?

Thanks
Post #1392504
Sean Lange
Posted Tuesday, December 04, 2012 8:21 AM


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Sounds like you should look into a calendar table. Check out this article. http://www.sqlservercentral.com/articles/T-SQL/70482/

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Post #1392529
var05
Posted Tuesday, December 04, 2012 8:40 AM
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Thanks WIll take a look at it:)
Post #1392552
arnipetursson
Posted Tuesday, December 04, 2012 9:10 AM
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set DATEFIRST 1
declare @dt datetime
select @dt = '12/09/2012'

select previousMonday = dateadd(dd,(-1)*(datepart(dw,@dt)-1),@dt)

set DATEFIRST 7
Post #1392563
var05
Posted Tuesday, December 04, 2012 9:23 AM
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Thanks for the reply.

I used the below case statement in my Select statement to get the starting day as Monday:

(CASE WHEN datename(dw,date) <> 'Sunday' THEN CONVERT(varchar(10), DATEADD(WK, DATEDIFF(WK, 0, date), 0),
103) ELSE CONVERT(varchar(10), DATEADD(WK, DATEDIFF(WK, 0, date), - 7), 103) END)


Thanks all!
Post #1392571
Lynn Pettis
Posted Tuesday, December 04, 2012 10:04 AM


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Compare:


DECLARE @date DATE = '20121202';
SELECT 
CASE WHEN datename(dw,@date) <> 'Sunday' THEN CONVERT(varchar(10), DATEADD(WK, DATEDIFF(WK, 0, @date), 0), 
103) ELSE CONVERT(varchar(10), DATEADD(WK, DATEDIFF(WK, 0, @date), - 7), 103) END
go

DECLARE @date DATE = '20121203';
SELECT 
CASE WHEN datename(dw,@date) <> 'Sunday' THEN CONVERT(varchar(10), DATEADD(WK, DATEDIFF(WK, 0, @date), 0), 
103) ELSE CONVERT(varchar(10), DATEADD(WK, DATEDIFF(WK, 0, @date), - 7), 103) END
go

DECLARE @date DATE = '20121202';
select dateadd(wk, datediff(wk, 0, DATEADD(dd,-1,@Date)), 0);
GO

DECLARE @date DATE = '20121203';
select dateadd(wk, datediff(wk, 0, DATEADD(dd,-1,@Date)), 0);
GO


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Post #1392598
sgmunson
Posted Tuesday, December 04, 2012 10:54 AM
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How about:

CASE
	WHEN DATEPART(dw, THE_DATE) = 1 THEN DATEADD(dd, -6, THE_DATE)
	ELSE DATEADD(dd, 0 - (DATEPART(dw, THE_DATE) - 2), THE_DATE)
END

where THE_DATE is assumed to be the date field...

Steve
(aka sgmunson)

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Post #1392622
Lynn Pettis
Posted Tuesday, December 04, 2012 11:04 AM


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sgmunson (12/4/2012)
How about:

CASE
	WHEN DATEPART(dw, THE_DATE) = 1 THEN DATEADD(dd, -6, THE_DATE)
	ELSE DATEADD(dd, 0 - (DATEPART(dw, THE_DATE) - 2), THE_DATE)
END

where THE_DATE is assumed to be the date field...



No conditional logic required:


DECLARE @date DATE = '20121202';
select dateadd(wk, datediff(wk, 0, DATEADD(dd,-1,@Date)), 0);
GO

DECLARE @date DATE = '20121203';
select dateadd(wk, datediff(wk, 0, DATEADD(dd,-1,@Date)), 0);
GO


Lynn Pettis

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For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here or when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here and here
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Post #1392627
Michael Valentine Jones
Posted Tuesday, December 04, 2012 11:07 AM
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select
	a.*,
	Monday = dateadd(dd,(datediff(dd,-53690,a.DATE)/7)*7,-53690)
from
	( -- Test Data
	select [Date]	= getdate()-2	union all
	select [Date]	= getdate()-1	union all
	select [Date]	= getdate()	union all
	select [Date]	= getdate()+1	union all
	select [Date]	= getdate()+2	union all
	select [Date]	= getdate()+3	union all
	select [Date]	= getdate()+4	union all
	select [Date]	= getdate()+5	union all
	select [Date]	= getdate()+6	union all
	select [Date]	= getdate()+7	union all
	select [Date]	= getdate()+8
	) a
order by
	a.[Date]

Results:
Date                    Monday
----------------------- -----------------------
2012-12-02 13:05:22.770 2012-11-26 00:00:00.000
2012-12-03 13:05:22.803 2012-12-03 00:00:00.000
2012-12-04 13:05:22.803 2012-12-03 00:00:00.000
2012-12-05 13:05:22.803 2012-12-03 00:00:00.000
2012-12-06 13:05:22.803 2012-12-03 00:00:00.000
2012-12-07 13:05:22.803 2012-12-03 00:00:00.000
2012-12-08 13:05:22.803 2012-12-03 00:00:00.000
2012-12-09 13:05:22.803 2012-12-03 00:00:00.000
2012-12-10 13:05:22.803 2012-12-10 00:00:00.000
2012-12-11 13:05:22.803 2012-12-10 00:00:00.000
2012-12-12 13:05:22.803 2012-12-10 00:00:00.000
Post #1392630
Lynn Pettis
Posted Tuesday, December 04, 2012 11:17 AM


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Michael Valentine Jones (12/4/2012)
select
	a.*,
	Monday = dateadd(dd,(datediff(dd,-53690,a.DATE)/7)*7,-53690)
from
	( -- Test Data
	select [Date]	= getdate()-2	union all
	select [Date]	= getdate()-1	union all
	select [Date]	= getdate()	union all
	select [Date]	= getdate()+1	union all
	select [Date]	= getdate()+2	union all
	select [Date]	= getdate()+3	union all
	select [Date]	= getdate()+4	union all
	select [Date]	= getdate()+5	union all
	select [Date]	= getdate()+6	union all
	select [Date]	= getdate()+7	union all
	select [Date]	= getdate()+8
	) a
order by
	a.[Date]

Results:
Date                    Monday
----------------------- -----------------------
2012-12-02 13:05:22.770 2012-11-26 00:00:00.000
2012-12-03 13:05:22.803 2012-12-03 00:00:00.000
2012-12-04 13:05:22.803 2012-12-03 00:00:00.000
2012-12-05 13:05:22.803 2012-12-03 00:00:00.000
2012-12-06 13:05:22.803 2012-12-03 00:00:00.000
2012-12-07 13:05:22.803 2012-12-03 00:00:00.000
2012-12-08 13:05:22.803 2012-12-03 00:00:00.000
2012-12-09 13:05:22.803 2012-12-03 00:00:00.000
2012-12-10 13:05:22.803 2012-12-10 00:00:00.000
2012-12-11 13:05:22.803 2012-12-10 00:00:00.000
2012-12-12 13:05:22.803 2012-12-10 00:00:00.000



Or:


select
	a.*,
	Monday = dateadd(wk, datediff(wk, 0, DATEADD(dd,-1,a.Date)), 0)
from
	( -- Test Data
	select [Date]	= getdate()-2	union all
	select [Date]	= getdate()-1	union all
	select [Date]	= getdate()	union all
	select [Date]	= getdate()+1	union all
	select [Date]	= getdate()+2	union all
	select [Date]	= getdate()+3	union all
	select [Date]	= getdate()+4	union all
	select [Date]	= getdate()+5	union all
	select [Date]	= getdate()+6	union all
	select [Date]	= getdate()+7	union all
	select [Date]	= getdate()+8
	) a
order by
	a.[Date]


Lynn Pettis

For better assistance in answering your questions, click here
For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here or when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here and here
Managing Transaction Logs

SQL Musings from the Desert Fountain Valley SQL (My Mirror Blog)
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