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How can I get the start date & end date of given week number or month

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Hi Everyone,

 

I'm working on a procedure that is used to calculate data in weekly and monthly, currently I can use datepart function to extract the week number/month from given date (as the SQL below). The week number/month, extracted from previous step, will be put into a loop for calculating purpose. And we need to determine the start date and end date of specific week/month, could you please share me how get those date from given week number or month ?

 

SELECT @min_date_time = min(my_date) FROM my_table

   

--Minimum year in database

SELECT @min_year = datepart(yy,min(my_date)) FROM my_table

 

--Minimum month in database

SELECT @min_month = datepart(mm,min(my_date)) FROM my_table

 

--Minimum week in database

SELECT @min_week = datepart(wk,min(my_date)) FROM my_table

 

 

SELECT @curr_date_time = getdate()

 

--Current year

SELECT @curr_year = datepart(yy, @curr_date_time)

 

--Current month

SELECT @curr_month = datepart(mm, @curr_date_time)

 

--Current week

SELECT @curr_week = datepart(wk, @curr_date_time)

 

WHILE @min_week <= @curr_week

BEGIN

 

@start_date_of_week = ???

@end_date_of_week = ???

 

/*Do Some Logic*/

 

SELECT @min_week = @min_week + 1

 

END

 

WHILE @min_month <= @curr_month

BEGIN

 

@start_date_of_month = ???

@end_date_of_month = ???

 

/*Do Some Logic*/

 

 

SELECT @min_month = @min_month + 1

END

 

P/S: I also have similar logic for Oracle too, and I haven't found a solution yet. If you can help me on that, I really appreciate

 

Thanks

Khoa Tran


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