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Editorial Team
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Asked: 2026-05-16T06:50:23+00:00

I want to be able to send reminders for appointments. Given the tables: –

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I want to be able to send reminders for appointments. Given the tables:

- Appointment
  ID (PK)
  Start

- Reminder
  AppointmentID (FK)
  MinutesBeforeAppointmentToSendReminder -- only need minute resolution

I would like to select reminder times:

select ..., DateAdd(minutes, -Reminder.MinutesBeforeAppointmentToSendReminder, Appointment.Start) as ReminderTime
from Appointment join Reminder
  on (Appointment.ID = Reminder.AppointmentID)
where (...)

The database platform is SQL Server 2008. LinqToSql will be used to access the database.

There are a slew of date/time types and functions in SQL Server 2008. What are the best types to use for Start and MinutesBeforeAppointmentToSendReminder. What is the best date function to use? [i.e., “best” considering performance, convenience and portability]

(Was planning on DateTime, int, DateAdd)

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1 Answer

  1. Editorial Team

    If you need to resolve to the minute only, then use smalldatetime not datetime.

    For differences, I’d suggest smallint which gives you 32k minutes and DATEADD which keep calculation in the date/stime-type domain

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