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Help with Date

Author

Topic

aidmondo
Starting Member

23 Posts

Posted - 2012-05-14 : 09:57:18

I have a table Events with (EventID int Primary Key Identity,
StartDate datetime not null)
Now I have to Create table Payment(PaymentID int Primary Key,
EventID int Foreign Key References Events(EventID),
PaymentDate datetime)
how do I Specify that PaymentDate should be < StartDate in events table.

aidmondo

dipuvp2004
Starting Member

1 Post

Posted - 2012-05-20 : 15:59:24

This is possible using a triggger. for insert and update validation can be done inside the trigger.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2012-05-20 : 17:30:07

CHECK constraint based on UDF should be enough. something like


CREATE FUNCTION DateValidate
(
@Date datetime,
@EventID int
)
RETURNS bit
AS
BEGIN 
DECLARE @Ret bit,@StartDate datetime

SELECT @StartDate = StartDate
FROM Events
WHERE EventID = @EventID

SELECT @Ret = CASE WHEN @Date > @StartDate THEN 0 ELSE 1 END

RETURN (@Ret)
END



ALTER TABLE Payment ADD CONSTRAINT Chk_PaymentDate CHECK (dbo.DateValidate(PaymentDate,EventID) = 1)

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

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