DATE CALCULATION from SELECT query

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Dear Professionals,

I am lost in this problem below:

I have an Access Table that stores Members Info including date of births.
With my Windows Forms Application using VB2010, I want to query the Members Table to select only members whose birth dates fall between NOW and the next 7 days.

That is, Peter's Birth date is: 27rd Sept. 1982. But today's date is 24th Sept. 2012.
In 3 days time, Peter will be celebrating his birth date.

With this in mind, I have created a listbox control to store the names of persons selected from the members' table whose birth date is between NOW and next 7 days.

I only need to retrieve the SELECT statement and I can populate the LIST Box control with the data using a ADODB.RECORDSET object.

I do not know how to complete the SELECT query of this task. Please can someone help me?

NB:
MS Access
Windows Forms
Visual Basic 2010.

Posted 24-Sep-12 6:53am

Eyo1

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Maciej Los · Answer 1 · 2012-09-24T12:17:00

If you would like to compare the BirthDate with some range of dates, you need to use a simple trick: replace the year part of [BirthDate] with current year and compare it with these dates.

But how to replace the year part in BirthDate?
In MS SQL Server 2012 use the DATEFROMPARTS[^] method. In the previous versions of MS SQL Server, you need to write custom function to create date from parts of BithDate. For example:

SQL

-- =============================================
-- Description:	Gets date from parts
-- =============================================
CREATE FUNCTION [dbo].[CREATEDATE] 
(
	-- Add the parameters for the function here
	@aYear INT = 0,
	@aMonth INT = 0,
	@aDay INT = 0
)
RETURNS DATETIME
AS
BEGIN
	-- Declare the return variable here
	DECLARE @Result DATETIME
        -- replace '-' date separator with '/' if necessary ;)
	SET @Result = '1900-01-01'

	-- Add the T-SQL statements to compute the return value here
	IF (@aYear>=1900 AND @aMonth>0 AND @aDay>0)
	BEGIN
		SELECT  @Result = DATEADD(mm,(@aYear-1900)* 12 + @aMonth - 1,0) + (@aDay-1) 
		--another method:
                --SELECT @Result = CONVERT(DATETIME,@aYear + '/' + @aMonth + '/' + @aDay) 
	END

	-- Return the result of the function
	RETURN @Result

END

And finally, the query should looks like this one:

SQL

DECLARE @begDate DATETIME
DECLARE @endDate DATETIME

--get the current date
SET @begDate = GETDATE()
--get the current date + 7 days
SET @endDate = DATEADD(d, 7, @begDate)

--if you would like to see the result dates, uncomment below command
--SELECT @begDate As [dateFrom], @endDate AS [dateTo]

--trick: replace the year part of [BirthDate] with current year and compare it with above dates
SELECT [pName], [Birthdate]
FROM PEOPLE
WHERE [dbo].CREATEDATE(YEAR(GETDATE()), MONTH([Birthdate]), DAY([Birthdate])) BETWEEN @begDate AND @endDate

[EDIT]
In MS Access:

SQL

SELECT  [pName], [Birthdate]
FROM PEOPLE
WHERE DateSerial(Year(Date()), Month([BirthDate]) ,Day([BirthDate])) BETWEEN Date() and DateAdd("d", 7, Date());

[/EDIT]

That's all!

**Zoltán Zörgő** · Answer 2 · 2012-09-24T07:19:00

Solution 1

Something like this would be good:

SQL

SELECT *
FROM Birthdates
WHERE BirthDate BETWEEN now and DateAdd("d", 7, now);

Posted 24-Sep-12 7:19am

Zoltán Zörgő

Comments

Maciej Los 24-Sep-12 17:09pm

Not exactly... Why? 27. September 1982 is not between TODAY() and TODAY()+7.
See my answer ;)

Zoltán Zörgő 25-Sep-12 2:23am

Might be, but the OP had following requirement: whose birth date is between NOW and next 7 days. But you have right, the question should have been: whose birthday is between NOW and next 7 days...

Maciej Los 25-Sep-12 15:09pm

5, because you might be right ;)

solanki.net · Answer 3 · 2012-09-24T21:27:00

Solution 4

In sql server u can try like :

select * from Test where TestDate between GETDATE() and DATEADD(DAY, 7, GETDATE())

Posted 24-Sep-12 21:27pm

solanki.net

Updated 24-Sep-12 21:29pm

v2