Appointment Rebooking

I need some assistance with some SQL

I have a table that contains appointments

AppName       AppDate         AppTime

After an appointment has been booked, a ' Rebook' button is available for people to rebook that appointment if the time and date changes..

This all works but what I want to do now is this.

When people try to rebook I DON"T want them to be able to choose a date that is AFTER the next appointment.


Appointment 1    01/05/2015

Appointment 2     15/05/2015

If people choose to rebook appointment 1 then I want it to stop people choosing a date beyond Appointment 2.  So the only available dates to rebook would be between 01/05/2015  and 15/05/2015.

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Easwaran ParamasivamCommented:
Simple. Add validation by calling an SP while re-booking. Pass the selected date as input parameter to the SP

create proc Validate (@Input datetime)
declare @retvalue int =  0

--Assuming tTable contains the Appointment2  data value. Kindly change in your case accordingly.
if exists (select   1
from tTable where   Appointment2 < @Input )
set @retvalue =  0
set @retvalue =  1

--In UI read the @retvalue. If it is 1 then it fails the validation. In this case don't allow to rebook



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EdAuthor Commented:
thanks, could you give a bit of SQL to assist with this?
Easwaran ParamasivamCommented:
EdAuthor Commented:
Perfect , thanks
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Microsoft SQL Server 2008

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