SQL Server: whole weeks total in a calendar month - sql

Question

I want weekly totals in a month. It will not include any partial week or future weeks. Week starts from Monday to Sunday.
I have a table structure like
Date Value -- Comments
----------------------------------------------------------------------
2016-10-01 7 Ignore this because its not a whole week in a month
2016-10-05 8 Week 1
2016-10-07 5 Week 1
2016-10-11 2 Week 2
2016-10-15 1 Week 2
2016-10-17 9 Ignore this because the week is not finished yet
OUTPUT
WeekNo Total
41 13
42 3

Answer 1

The easier way would be to build a Tally "date" table.
you can generate it from any Tally Table like:
DECLARE #StartDate DATE = '20160101'
, #EndDate DATE = '20161231';
WITH cte AS (
SELECT DATEADD(DAY, n - 1, #StartDate) AS date
FROM tally
WHERE n - 1 <= DATEDIFF(DAY, #StartDate, #EndDate)
)
SELECT
c.date
,YEAR(c.date) AS Year
,MONTH(c.date) AS Month
,DAY(c.date) AS Month
,DATEPART(WEEK,c.date) AS Week
,CASE WHEN 7<>COUNT(c.date) OVER (PARTITION BY YEAR(c.date),MONTH(c.date),DATEPART(WEEK,c.date)) THEN 0 ELSE 1 END AS isFullWeek
FROM cte c
Then you just need to Join it to what ever query you need.

Answer 2

DECLARE #StartDate datetime = '2011-10-01';
DECLARE #EndDate datetime = '2016-10-31';
SELECT
CAST(DATEADD(dd, -DATEPART(dw, tblData.RecordDate) + 2, tblData.RecordDate) AS date) AS WeekStart,
CAST(DATEADD(dd, -DATEPART(dw, tblData.RecordDate) + 8, tblData.RecordDate) AS date) AS WeekEnd,
SUM(Value) AS Total
FROM tblData
WHERE (#StartDate IS NULL
OR CAST(DATEADD(dd, -DATEPART(dw, tblData.RecordDate) + 2, tblData.RecordDate) AS date) >= CAST(#StartDate AS date))
AND (#EndDate IS NULL
OR CAST(DATEADD(dd, -DATEPART(dw, tblData.RecordDate) + 8, tblData.RecordDate) AS date) <= CAST(#EndDate AS date))
AND CAST(DATEADD(dd, -DATEPART(dw, tblData.RecordDate) + 8, tblData.RecordDate) AS date) < CAST(GETDATE() AS date)
GROUP BY CAST(DATEADD(dd, -DATEPART(dw, tblData.RecordDate) + 2, tblData.RecordDate) AS date),
CAST(DATEADD(dd, -DATEPART(dw, tblData.RecordDate) + 8, tblData.RecordDate) AS date)

Answer 3

Create a calendar table that meets your request, like this:
create table calendarTable ([date] date, weekNro int)
go
insert into calendarTable
select dateadd(d,n,'20160101'), DATEPART(WK,dateadd(d,n,'20151231'))
from numbers where n<500
If you don't have a Numbers Table, you must create it first. like this
SET NOCOUNT ON
CREATE TABLE Numbers (n bigint PRIMARY KEY)
GO
DECLARE #numbers table(number int);
WITH numbers(number) as (
SELECT 1 AS number
UNION all
SELECT number+1 FROM numbers WHERE number<10000
)
INSERT INTO #numbers(number)
SELECT number FROM numbers OPTION(maxrecursion 10000)
INSERT INTO Numbers(n) SELECT number FROM #numbers
Then query your table joining calendar table having in mind actual date for completed week, like this:

Answer 4

Similar to #Kilren but translated into postgres and using generate series from https://stackoverflow.com/a/11391987/10087503 to generate the dates
DECLARE #StartDate DATE = '20160101'
, #EndDate DATE = '20161231';
WITH cte AS (
SELECT i::date AS date FROM generate_series(#StartDate,
#EndDate, '1 day'::interval) i
)
SELECT
c.date
,DATE_TRUNC('month' ,c.date) AS month_trunc
,DATE_PART('week',c.date) AS week
,CASE WHEN 7<>COUNT(c.date)
OVER (PARTITION BY DATE_TRUNC('month' ,c.date),DATE_PART('week',c.date))
THEN 0 ELSE 1 END AS is_full_week
FROM cte c

Answer 5

Select DATEPART(ww, date) , SUM(Case When Comments Like '%1' then Value when Comments Like '%2' then Value else Value end)
from schema.tablename
group by DATEPART(ww,date)
I'm sorry if this doesn't work, it's the only way I thought to structure it.