To Display Current Week data in sql:-

CREATE FUNCTION dbo.udf_DisplayCurrentWeekDateDays
(@today SMALLDATETIME)
RETURNS @WeekDateDay TABLE
(
Sunday SMALLDATETIME,
Monday SMALLDATETIME,
Tuesday SMALLDATETIME,
Wednesday SMALLDATETIME,
Thursday SMALLDATETIME,
Friday SMALLDATETIME,
Saturday SMALLDATETIME
)
AS
BEGIN
DECLARE @day INT
SET @today = CAST(CONVERT(VARCHAR(10), @today, 101) AS SMALLDATETIME)
SET @day = DATEPART(dw, @today)
INSERT INTO @WeekDateDay (Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday)
SELECT DATEADD(dd, 1 - @day, @today) Sunday,
DATEADD(dd, 2 - @day, @today) Monday,
DATEADD(dd, 3 - @day, @today) Tuesday,
DATEADD(dd, 4 - @day, @today) Wednesday,
DATEADD(dd, 5 - @day, @today) Thursday,
DATEADD(dd, 6 - @day, @today) Friday,
DATEADD(dd, 7 - @day, @today) Saturday
RETURN
END
GO




for more reference :-
http://blog.sqlauthority.com/2007/06/08/sql-server-udf-function-to-display-current-week-date-and-day-weekly-calendar/

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