Help needed with C# / SQL appointment scheduler

Posted on 2007-03-18
Last Modified: 2008-03-06
I'm trying to figure out a simple and efficient way to build part of an appointment scheduler.  Basically, I have a SQL table with start and end times by date (the start and end times when a hairdresser is on the clock), and another table with existing scheduled appointments (includes time and date).   What I need to do is create a list of available times in half hour increments to display in a datagrid, but I'm not sure where to start.  Any ideas?  This is a modification of an existing application, so I have limited ability to make changes to the existing tables, but I can add new tables and stored procedures.

Question by:esw074
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
LVL 30

Expert Comment

ID: 18746927
There are a few ways to do it. This is how I would do it;

1. Create a table which has a record for each 'timeslot'.

For example if you are open from 9 to 5 with 15 minute timeslots, that means 32 records.
The table has three fields:

Label (VARCHAR(20))

You populate this with all the timeslots.

Then you can create a view which joins this table (a 'timeslot' table) and your other two tables to return the data you want.

Post the existing table structure and I can help further.


Author Comment

ID: 18748137
Cool.  Ok, so let's say that the timeslot table you've proposed contains 32 timeslots beginning at 9 and ending at 5 using the fields above.

The appointments table contains existing appointment start and end times.  Let's say that for today, March 19, it contains two appointments - one from 10:00am-11:00am, and one from 1:00pm to 2:00pm.    We'll call the fields in the appointment table apptStartDate, apptStartTime and apptEndTime.

What I want to display is a list of available appointment times for March 19, meaning all of the appointment times in the timeslot table that are not already booked (every timeslot except 10am-11am and 1pm-2pm).  What do you think?  

LVL 30

Accepted Solution

nmcdermaid earned 500 total points
ID: 18754953
Basically this shows the entire calendar:

SELECT T.TimeslotLabel, ISNULL(A.AppointmentName,'No Appointment') As Appointment
FROM tblTimeslots T
tblAppointments A
ON T.StartDateTime >= A.apptStartDate
AND T.EndDateTime <= A.apptEndDate

Then you can filter that to show just free times:

SELECT T.TimeslotLabel
FROM tblTimeslots T
tblAppointments A
ON T.StartDateTime >= A.apptStartDate
AND T.EndDateTime <= A.apptEndDate
WHERE A.AppointmentName IS NULL

Author Comment

ID: 18781534
Sorry it took so long to confirm.  This is great, thanks!

Featured Post

SharePoint Admin?

Enable Your Employees To Focus On The Core With Intuitive Onscreen Guidance That is With You At The Moment of Need.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Real-time is more about the business, not the technology. In day-to-day life, to make real-time decisions like buying or investing, business needs the latest information(e.g. Gold Rate/Stock Rate). Unlike traditional days, you need not wait for a fe…
The Delta outage: 650 cancelled flights, more than 1200 delayed flights, thousands of frustrated customers, tens of millions of dollars in damages – plus untold reputational damage to one of the world’s most trusted airlines. All due to a catastroph…
Using examples as well as descriptions, and references to Books Online, show the documentation available for date manipulation functions and by using a select few of these functions, show how date based data can be manipulated with these functions.
Using examples as well as descriptions, and references to Books Online, show the different Recovery Models available in SQL Server and explain, as well as show how full, differential and transaction log backups are performed

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question