Database table design for scheduling tasks

Question

I want to be able to create schedules that can be executed based on a fixed date, repeated daily, repeated on a particular day of the week, repeated on a particular month of

Answer 1

I think the accepted answer is much more complicated than it needs to be. This can be done with a single table like this:

Schedules

 - Id :int
 - Greetingid :int
 - Startdate :date
 - Frequencytype :char(1)
 - Frequencyinterval :int
 - Timeofday :time

Frequencytype would be one of the following values

• 'O' = Once
• 'D' = Daily
• 'W' = Weekly
• 'M' = Monthly
• 'A' = Annually

Frequencyinterval would be numeric and the meaning of the value depends on the value of frequencytype

• If type = 'Once' then value = 0 (no interval) schedule would execute on startdate
• If type = 'Daily' then value = # of days interval
• If type = 'Weekly' then 1 through 7 for day of the week
• If type = 'Monthly' then 1 through 31 for day of the month
• If type = 'Annually' then 1 through 365 for day of the year