johnnyg123
asked on
Sql query for data range
Trying to write a query that will return a 3 month range that will start 2 months back from a given date
(SQL server 2008)
For example if given date is '05/01/2015'
I would want
Startdate EndDate
01/01/2015 03/31/2015
(SQL server 2008)
For example if given date is '05/01/2015'
I would want
Startdate EndDate
01/01/2015 03/31/2015
Try this:
DECLARE @Date datetime,
@StartDate datetime,
@EndDate datetime
SET @Date = '2015-04-01'
SET @StartDate = CONVERT(DATE, DATEADD(month, -2, @Date)) -- As of midnight
SET @EndDate = CONVERT(DATE, DATEADD(month, 3, @StartDate))
SET @EndDate = @EndDate - .00000005 -- Makes it as of 23:59:59.997
SELECT *
FROM YourTable
WHERE YourDate BETWEEN @StartDate AND @EndDate
There are certainly other ways to do this by eliminating some of the dates and consolidating the math, but I'm assuming you may have need for the @StartDate and @EndDate, so am giving this as is.
ASKER
oops meant that the end date of the range should be 2 month s back
What I'm trying to do is get a 3 month range that has end date that goes back 1 month from a given date
basically our marketing department has a promotion that starts the first of each month (They like to work in the future)
They want me to give a list of coupons that were redeemed in a 3 month period prior
They do not want to include the month immediately prior to the given date in that range (not exactly sure why but)
so if the given date is 05/01/2015 they would the range to be 01/01/2015 to 03/31/2015
likewise if the given date was 06/01/2015 the range would be 02/01/2015 to 04/30/2015
Hope that makes sense
What I'm trying to do is get a 3 month range that has end date that goes back 1 month from a given date
basically our marketing department has a promotion that starts the first of each month (They like to work in the future)
They want me to give a list of coupons that were redeemed in a 3 month period prior
They do not want to include the month immediately prior to the given date in that range (not exactly sure why but)
so if the given date is 05/01/2015 they would the range to be 01/01/2015 to 03/31/2015
likewise if the given date was 06/01/2015 the range would be 02/01/2015 to 04/30/2015
Hope that makes sense
This should work:
DECLARE @Date datetime,
@StartDate datetime,
@EndDate datetime
SET @Date = '2015-05-01'
SET @EndDate = CONVERT(DATE, DATEADD(month, -2, @Date))
SET @StartDate = CONVERT(DATE, DATEADD(month, -3, @EndDate))
SET @EndDate = @EndDate - .00000005 -- Makes it as of 23:59:59.997
SELECT *
FROM YourTable
WHERE YourDate BETWEEN @StartDate AND @EndDate
ASKER
I do not need the time so I change it to the following
If I run
DECLARE @Date date,
@StartDate date,
@EndDate date
SET @Date = '2015-05-01'
SET @EndDate = CONVERT(DATE, DATEADD(month, -2, @Date))
SET @StartDate = CONVERT(DATE, DATEADD(month, -3, @EndDate))
select @StartDate as startdate,
@EndDate as enddate
I get
startdate enddate
2014-12-01 2015-03-01
Instead of 01/01/2015 to 03/31/2015
startdate enddate
2015-01-01 2015-03-31
If I run
DECLARE @Date date,
@StartDate date,
@EndDate date
SET @Date = '2015-05-01'
SET @EndDate = CONVERT(DATE, DATEADD(month, -2, @Date))
SET @StartDate = CONVERT(DATE, DATEADD(month, -3, @EndDate))
select @StartDate as startdate,
@EndDate as enddate
I get
startdate enddate
2014-12-01 2015-03-01
Instead of 01/01/2015 to 03/31/2015
startdate enddate
2015-01-01 2015-03-31
I answered with datetime on the side of caution. However, subtracting that .000005 to achieve 23:59:59.997 will need to be replaced by subtracting a day, so that you don't wind up with a range of 3 months + 1 day.
This will solve that:
This will solve that:
DECLARE @Date date,
@StartDate date,
@EndDate date
SET @Date = '2015-05-01'
SET @EndDate = DATEADD(month, -2, @Date)
SET @StartDate = DATEADD(month, -3, @EndDate)
SET @EndDate = DATEADD(day, -1, @EndDate)
SELECT @StartDate AS StartDate,
@EndDate AS EndDate
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ASKER
Sorry I think I'm not explaining my self to well
Then end result should be
startdate enddate
2015-01-01 2015-03-31
I am getting
startdate enddate
2014-12-01 2015-03-01
executing the code you provided
I should mention that the given date will always be the first of a month
since in the example start date is May 1
need to skip the month of april
so march is the end month and thus 03/31/2015 is the end date
then need to include 2 months prior to march to get a total of 3 which would be jan and feb thus the start date of jan 01 2015
Hope that helps!
Then end result should be
startdate enddate
2015-01-01 2015-03-31
I am getting
startdate enddate
2014-12-01 2015-03-01
executing the code you provided
I should mention that the given date will always be the first of a month
since in the example start date is May 1
need to skip the month of april
so march is the end month and thus 03/31/2015 is the end date
then need to include 2 months prior to march to get a total of 3 which would be jan and feb thus the start date of jan 01 2015
Hope that helps!
SOLUTION
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ASKER
Thanks for the Posts!
I used a combined approach so I will split the points
here is what I went with
DECLARE @given_date date
DECLARE @months_to_back_up smallint
DECLARE @months_to_list smallint
SET @given_date = '05/31/2015'
SET @months_to_back_up = 3
SET @months_to_list = 3
DECLARE @start_date date
DECLARE @End_date date
SET @start_date = DATEADD(MONTH, DATEDIFF(MONTH , 0, @given_date ) - (@months_to_back_up + 1) , 0)
SET @End_date = Dateadd(day,-1,DATEADD(MON TH, @months_to_list, @start_date))
select @start_date startdate, @end_date enddate
I used a combined approach so I will split the points
here is what I went with
DECLARE @given_date date
DECLARE @months_to_back_up smallint
DECLARE @months_to_list smallint
SET @given_date = '05/31/2015'
SET @months_to_back_up = 3
SET @months_to_list = 3
DECLARE @start_date date
DECLARE @End_date date
SET @start_date = DATEADD(MONTH, DATEDIFF(MONTH , 0, @given_date ) - (@months_to_back_up + 1) , 0)
SET @End_date = Dateadd(day,-1,DATEADD(MON
select @start_date startdate, @end_date enddate
You should always check date/datetime/datetime2 values using >= and <, not <=. That insures both accuracy and performance, even if the data type of the table column changes, such as from datetime to datetime2 or from date to datetime.
That is, to check for the month of Jan, do this:
>= '20150101' AND < '20150201'
and not this:
>= '20150101' AND <= '20150131'
That is, to check for the month of Jan, do this:
>= '20150101' AND < '20150201'
and not this:
>= '20150101' AND <= '20150131'
>For example if given date is '05/01/2015'
Wouldn't this make the start date 3/1/2015? Your stated results shows 1/1/2015.