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Editorial Team
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Asked: 2026-05-27T20:32:58+00:00

I have a event table that has the following columns: StartDate datetime EndDate datetime

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I have a event table that has the following columns:

StartDate datetime
EndDate datetime
StartTime nvarchar(10)
EndTime nvarchar(10)

Let’s say a record has these values in the table:

StartDate: 2011-12-22 00:00:00.000
EndDate: 2011-12-22 00:00:00.000
StartTime: 4:00 PM
EndTime: 5:00 PM

Now, if someone comes to schedule an event, I need to make sure he can’t schedule it for the same time or between the start and end times of this existing event.

So, he can schedule from 5:00 PM to 6:00 PM or from 11:00 AM to 4:00 PM but not 11:00 AM to 5:00 PM or 4:30 PM to 5:00 PM.

How can I check for this? I know this isn’t the best design for this table, but I have to stick to this design, else we will have to change a lot of middle layer and client side code.

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1 Answer

  1. Editorial Team

    Try this

    declare @apptDate DATETIME

SET @apptDate = '12/22/2011 4:30PM'
select COUNT(*) 
from t1
where @apptDate Between
CAST( StartDate+StartTime as DateTime) and CAST( EndDate+EndTime as DateTime)  

SET @apptDate = '12/22/2011 6:30PM'
select COUNT(*) 
from t1
where @apptDate Between
CAST( StartDate+StartTime as DateTime) and CAST( EndDate+EndTime as DateTime)

    If count(*) > 0, an appointment exists. If not, the spot is free

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