Get Data Week Wise in SQL Server - tsql

Question

I have a Table with columns ProductId, DateofPurchase, Quantity.
I want a report in which week it belongs to.
Suppose if I give March Month I can get the quantity for the march month.
But I want as below if I give date as parameter.
Here Quantity available for March month on 23/03/2018 is 100
Material Code Week1 Week2 Week3 Week4
12475 - - - 100
The logic is 1-7 first week, 8-15 second week, 16-23 third week, 24-30 fourth week

Answer 1

#Sasi, this can get you started. YOu will need to use CTE to build a template table that describes what happens yearly. Then using your table with inner join you can link it up and do a pivot to group the weeks.
Let me know if you need any tweaking.
DECLARE #StartDate DATE='20180101'
DECLARE #EndDate DATE='20180901'
DECLARE #Dates TABLE(
Workdate DATE Primary Key
)
DECLARE #tbl TABLE(ProductId INT, DateofPurchase DATE, Quantity INT);
INSERT INTO #tbl
SELECT 12475, '20180623', 100
;WITH Dates AS(
SELECT Workdate=#StartDate,WorkMonth=DATENAME(MONTH,#StartDate),WorkYear=YEAR(#StartDate), WorkWeek=datename(wk, #StartDate )
UNION ALL
SELECT CurrDate=DateAdd(WEEK,1,Workdate),WorkMonth=DATENAME(MONTH,DateAdd(WEEK,1,Workdate)),YEAR(DateAdd(WEEK,1,Workdate)),datename(wk, DateAdd(WEEK,1,Workdate)) FROM Dates D WHERE Workdate<#EndDate ---AND (DATENAME(MONTH,D.Workdate))=(DATENAME(MONTH,D.Workdate))
)
SELECT *
FROM
(
SELECT
sal.ProductId,
GroupWeek='Week'+
CASE
WHEN WorkWeek BETWEEN 1 AND 7 THEN '1'
WHEN WorkWeek BETWEEN 8 AND 15 THEN '2'
WHEN WorkWeek BETWEEN 16 AND 23 THEN '3'
WHEN WorkWeek BETWEEN 24 AND 30 THEN '4'
WHEN WorkWeek BETWEEN 31 AND 37 THEN '5'
WHEN WorkWeek BETWEEN 38 AND 42 THEN '6'
END,
Quantity
FROM
Dates D
JOIN #tbl sal on
sal.DateofPurchase between D.Workdate and DateAdd(DAY,6,Workdate)
)T
PIVOT
(
SUM(Quantity) FOR GroupWeek IN (Week1, Week2, Week3, Week4, Week5, Week6, Week7, Week8, Week9, Week10, Week11, Week12, Week13, Week14, Week15, Week16, Week17, Week18, Week19, Week20, Week21, Week22, Week23, Week24, Week25, Week26, Week27, Week28, Week29, Week30, Week31, Week32, Week33, Week34, Week35, Week36, Week37, Week38, Week39, Week40, Week41, Week42, Week43, Week44, Week45, Week46, Week47, Week48, Week49, Week50, Week51, Week52
/*add as many as you need*/)
)p
--ORDER BY
--1
option (maxrecursion 0)

Answer 2

Sample Data :
DECLARE #Products TABLE(Id INT PRIMARY KEY,
ProductName NVARCHAR(50))
DECLARE #Orders TABLE(ProductId INT,
DateofPurchase DATETIME,
Quantity BIGINT)
INSERT INTO #Products(Id,ProductName)
VALUES(1,N'Product1'),
(2,N'Product2')
INSERT INTO #Orders( ProductId ,DateofPurchase ,Quantity)
VALUES (1,'2018-01-01',130),
(1,'2018-01-09',140),
(1,'2018-01-16',150),
(1,'2018-01-24',160),
(2,'2018-01-01',30),
(2,'2018-01-09',40),
(2,'2018-01-16',50),
(2,'2018-01-24',60)
Query :
SELECT P.Id,
P.ProductName,
Orders.MonthName,
Orders.Week1,
Orders.Week2,
Orders.Week3,
Orders.Week4
FROM #Products AS P
INNER JOIN (SELECT O.ProductId,
SUM((CASE WHEN DATEPART(DAY,O.DateofPurchase) BETWEEN 1 AND 7 THEN O.Quantity ELSE 0 END)) AS Week1,
SUM((CASE WHEN DATEPART(DAY,O.DateofPurchase) BETWEEN 8 AND 15 THEN O.Quantity ELSE 0 END)) AS Week2,
SUM((CASE WHEN DATEPART(DAY,O.DateofPurchase) BETWEEN 16 AND 23 THEN O.Quantity ELSE 0 END)) AS Week3,
SUM((CASE WHEN DATEPART(DAY,O.DateofPurchase) >= 24 THEN O.Quantity ELSE 0 END)) AS Week4,
DATENAME(MONTH,O.DateofPurchase) AS MonthName
FROM #Orders AS O
GROUP BY O.ProductId,DATENAME(MONTH,O.DateofPurchase)) AS Orders ON P.Id = Orders.ProductId
Result :
-----------------------------------------------------------------------
| Id | ProductName | MonthNumber | Week1 | Week2 | Week3 | Week4 |
-----------------------------------------------------------------------
| 1 | Product1 | January | 130 | 140 | 150 | 160 |
| 2 | Product2 | January | 30 | 40 | 50 | 60 |
-----------------------------------------------------------------------