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Time Interval

Author

Topic

dia1234
Starting Member

12 Posts

Posted - 2013-07-11 : 06:25:38

I want to check a record in my table which has time ins and time outs feilds. I want to check on insertionof any new record that a new record should not be inserted on same timings and before 45 mins of timein and after 45 mins of timeout.

how do i do it sql query ?

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-07-11 : 07:16:10

create a check constraint on the table
create a udf
something like


CREATE FUNCTION RecCnt
(
@timein datetime,
@timeout datetime
)
RETURNS int
AS
BEGIN 
DECLARE @Cnt int

SELECT @Cnt=COUNT(*)
FROM YourTable
WHERE DATEDIFF(minute,@timein,timein) <= 45
OR DATEDIFF(minute,@timeout,timeout) <= 45
RETURN(@Cnt)
END

then use it like


ALTER TABLE YourTable ADD CONSTRAINT Chk_TimeOverlap CHECK (dbo.RecCnt(timein,timeout) = 0 )

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