Query to check Date in Sql - asp.net

Question

My query is simple yet bit twisted for me. Actually I am working on registration module of an app, where the registration expires 31st March every year. The registration is valid from April 1 to March 31. So whenever a user is registered in between the date, I want his status to be expired if march 31 is crossed.
Let me make more clear to you.
Say I have registered my self in 15Nov2010, then on 31st March 2011, my subscription will get expired. I want to check it automatically as the years will go on. I need a query that will automatically query the created date with expiration date. I am already having a select query and i need to embed this condition and i want to check the creation date with current system date. If Current system date is not 31 march midnight 12, the status must be active else expired.

Answer 1

This can be used for MS SQL to determine whether it has expired or not.
create table #t
(
CreateDate datetime
)
Insert Into #t
select GETDATE() union all
Select DateAdd(month,4, getdate())
Select Case When CreateDate < getdate() And
Getdate() < Cast(str(DatePart(year, getdate())) + '-03-31' as datetime) Then
'Active' Else 'Expired' end as [Status],
CreateDate
From #t
drop table #t
To filter your query you would simply move the case statement to a where clause
e.g.
Where Case When CreateDate < getdate() And
Getdate() < Cast(str(DatePart(year, getdate())) + '-03-31' as datetime) Then
'Active' Else 'Expired' end = 'Expired'

Answer 2

What you need is to schedule a job (i think they're called events on MySql) to run every year on March 31 11:59 and update set the status of all your accounts to expired. (remember to make dstinction on admin accounts) :)
Take a look at this.
for MySQL
http://dev.mysql.com/tech-resources/articles/mysql-events.html#1
for SqlServer
http://msdn.microsoft.com/en-us/library/ms191439.aspx
http://msdn.microsoft.com/en-us/library/ms190268.aspx

Answer 3

I am considering a table YourTable and it has a column Date of type datetime
You can use this query -
select [Date], dbo.GetStatus([Date]) as 'status' from YourTable
And, the function GetStatus -
CREATE FUNCTION [dbo].[GetStatus](#Date datetime)
RETURNS varchar(10)
AS
BEGIN
DECLARE #Return varchar(10)
DECLARE #Year int
SELECT #Year = DATEPART(YYYY,GETDATE())
IF GETDATE() >= CONVERT(datetime,'01-APR-' + CONVERT(varchar,#Year))
SET #Year = #Year + 1
IF #Date BETWEEN CONVERT(datetime,'01-APR-' + CONVERT(varchar,#Year-1)) AND CONVERT(datetime,'31-MAR-' + CONVERT(varchar,#Year))
set #return = 'active'
ELSE
set #return = 'inactive'
Return #return
END;

Answer 4

I'd probably have a "last renewed" column (It would initially store the creation date) then write:
SELECT CASE WHEN
YEAR(DATEADD(mm, -3, LastRenewed)) < (YEAR(GETDATE()) - 1)
THEN 'Active'
ELSE 'Expired' END
AS Status
FROM TableName
I don't see what the problem with #Barry's answer is though, to be honest. If you need to use this logic in several places you can avoid repeating yourself using a view eg:
CREATE VIEW ActiveOrNot AS
SELECT Account, CASE WHEN
YEAR(DATEADD(mm, -3, LastRenewed)) < (YEAR(GETDATE()) - 1)
THEN 'Active'
ELSE 'Expired' END
AS Status
FROM TableName
You could then select only active accounts using:
SELECT Account
FROM ActiveOrNot
WHERE Status = 'Active'