Display next event date

Question

The UI design for storing event and event meta data is

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Answer 1

The following will generate events based on StartEvent and MEta description with a CTE.

Change the values for MaxDate and MaxEvents according to parameters values.

declare @MaxDate datetime = convert(datetime,'12/2/2014', 101);
declare @MaxEvents integer=  200;

; With
    -- number generator by power of 2
    n2(n) as ( select 1 as n union all select 1),
    n4(n) as ( select 1 from n2 t1 cross join n2 t2 ),
    n16(n) as ( select 1 from n4 t1 cross join n4 t2 ),
    n256(n) as ( select 1 from n16 t1 cross join n16 t2 ),
    n65k(n) as ( select 1 from n256 t1 cross join n256 t2 ),
   Numbers (n) as (select row_number() over( order by n) from n65k ),

    -- Start of events 
    StartEvents as 
    ( SELECT 1 as EventNo, EV.Name, EM.ID, EM.Event_Id, EM.Meta_key, dateAdd(second,EM.meta_value,convert(datetime,'01/01/1970', 101)) as EventDate
        FROM events AS EV
        INNER JOIN events_meta  EM 
          ON EM.event_id = EV.id
          AND EM.meta_key = 'repeat_start'),
    -- Repeating events N times
    NextEvents AS
    ( SELECT Numbers.N+1 asEventNo, StartEvents.Name, EM.ID, EM.Event_Id, EM.Meta_key, dateAdd(second,EM.meta_value*Numbers.n,StartEvents.EventDate) as EventDate
        FROM StartEvents 
        INNER JOIN  events_meta EM 
            ON EM.event_id = StartEvents.event_id
            AND  EM.meta_key = 'repeat_interval_'+ ltrim(rtrim(str(StartEvents.ID )))
            AND ((1391040000- EM.meta_value ) % EM.meta_value) = 0 
     cross join Numbers 
     -- not to overflow (dateadd parameter is int type)
     Where Numbers.N < 3000
    )
   -- startEvents union nextEvents
  select EventNo, Name, Meta_key, EventDate
  FROM (
        Select * from StartEvents
        union all select * from NextEvents ) AllEvents
  where EventDate < @MaxDate
   and  EventNo < @MaxEvents
        order by ID ;