Display next event date

Question

The UI design for storing event and event meta data is

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Answer 1

One way of accomplishing this is by using a loop and inserting a record into a temp table. Then you can simply select from your temp table. In the example below I saved off both the unixtimestamp value as well as that value converted to datetime.

declare @enddate bigint, @intervalFactor int, @rowresult int

set @enddate = 1391040000

create table #Results
(
  eventid int,
  eventdate bigint,
  eventdatedate datetime
)

set @rowresult = 1
set @intervalFactor = 0

WHILE (@rowresult > 0)
BEGIN
  Insert #Results (eventid, eventdate, eventdatedate)
  Select events.id, date.meta_value + (intrvl.meta_value * @intervalFactor)
        ,DATEADD(ss,date.meta_value + (intrvl.meta_value * @intervalFactor), CAST('1970-01-01 00:00:00' AS datetime))
      from events
      inner join events_meta date
        on events.id = date.event_id
        AND date.meta_key = 'repeat_start'
      inner join events_meta intrvl
        on events.id = intrvl.event_id
        and intrvl.meta_key = 'repeat_interval_'+ CAST(date.id as Varchar(100))
  where ((@enddate - date.meta_value ) % intrvl.meta_value) >= 0
  and date.meta_value + (intrvl.meta_value * @intervalFactor) <= @enddate


  set @rowresult = @@rowcount
  set @intervalFactor = @intervalFactor + 1

END  

select * from #Results

Another possible solution for this problem would to utilize a recursive CTE.