Find Start Date / End Date of Week of THIS Year/ LAST [closed]

StackOverflow https://stackoverflow.com/questions/21787896

  •  11-10-2022
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Question

I am stumbling with SQL …see if you can help with 5 and 6

Business Need

  1. I have myDate
  2. I want SQL to give me week number for myDate
  3. I want SQL to return week start date of this year for myDate
  4. I want SQL to return week end date of this year for myDate
  5. (Need help)I want SQL to return week start date of LAST YEAR for myDate
  6. (Need help)I want SQL to return week end date of LAST YEAR for myDate

Comments on Data

  1. Date provided
  2. Date falls in week 19 of 2014
  3. Sunday of week 19 of 2014
  4. Saturday of week 19 of 2014
  5. Sunday of week 19 of 2013 (Need help getting this date with SQL)
  6. Saturday of week 19  of 2013 (Need help getting this date with SQL)

Sample Data

  1. 5/6/2014
  2. 19
  3. 5/4/2014
  4. 5/10/2014
  5. 5/5/2013
  6. 5/11/2013

SQL Queseries

  1. NA
  2. SELECT datepart(week, '05/06/2014')
  3. SELECT  CONVERT(varchar(50), (DATEADD(dd, @@DATEFIRST - DATEPART(dw, '05/06/2014') - 6, '05/06/2014')), 101)
  4. SELECT CONVERT(varchar(50), (DATEADD(dd, @@DATEFIRST - DATEPART(dw, '05/06/2014'), '05/06/2014')), 101)
  5. Man… I m hitting sql block here
  6. Again...hitting sql block here
Was it helpful?

Solution

Is that what you need??

SELECT CONVERT(varchar(50), (DATEADD(dd, @@DATEFIRST - DATEPART(dw,  DATEADD(year, -1, '05/06/2014')) - 6, DATEADD(year, -1, '05/06/2014'))), 101)
SELECT CONVERT(varchar(50), (DATEADD(dd, @@DATEFIRST - DATEPART(dw,  DATEADD(year, -1, '05/06/2014')), DATEADD(year, -1, '05/06/2014'))), 101)

Also, I would use some variables if this is your case.

declare @date Datetime = '05/06/2014'
declare @datePreviousYear Datetime = DATEADD(year, -1, @date)
declare @currentYeardateCalculated int = @@DATEFIRST - DATEPART(dw,  @date)
declare @lastYearDateCalculated int = @@DATEFIRST - DATEPART(dw,  @datePreviousYear)

--1
SELECT @date
--2
SELECT datepart(week,@date )
--3
SELECT  CONVERT(varchar(50), (DATEADD(dd, @currentYeardateCalculated - 6, @date)), 101)
--4
SELECT CONVERT(varchar(50), (DATEADD(dd, @currentYeardateCalculated, @date)), 101)

--5
SELECT  CONVERT(varchar(50), (DATEADD(dd, @lastYearDateCalculated - 6,@datePreviousYear)), 101)
--6
SELECT CONVERT(varchar(50), (DATEADD(dd, @lastYearDateCalculated , @datePreviousYear)), 101)
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