Display next event date

Question

The UI design for storing event and event meta data is

<

Answer 1

This will do it!

WITH mycte AS
(
    SELECT A.ID, A.Name, A.StartDate, A.StartDate AS [IntervalDate], A.Interval, A.[repeat_startID], A.[repeat_intervalID]
    FROM (
            -- this is your provided query
            -- can you run this derived table only and make sure it return what you expect?
        SELECT
             EV.*
            ,EM1.id AS [repeat_startID]
            ,EM2.id AS [repeat_intervalID]
            -- I convert to datetime becuase Im more familiar with datatype=time manipulations
            ,DATEADD(SECOND,EM1.meta_value,'1970-01-01') AS [StartDate]
            ,EM2.meta_value AS [Interval]
        FROM [EVENTS] AS EV
            -- I used inner joins, please modify that as needed.
            INNER JOIN [EVENTS_META] AS EM1 ON EM1.meta_key = 'repeat_start' AND EM1.event_id = EV.id
            INNER JOIN [EVENTS_META] AS EM2 ON EM2.meta_key = 'repeat_interval_'+ CAST(EM1.id as Varchar(100))
    ) AS A
    UNION ALL
    SELECT  ID, Name, StartDate, DATEADD(SECOND,Interval,[IntervalDate]), Interval, [repeat_startID], [repeat_intervalID]
    FROM    mycte   
    WHERE   DATEADD(SECOND,1,[IntervalDate]) < '2014-01-30 00:00:00.000' -- this is your epoch timestamp
)
SELECT * FROM mycte 
-- it is unclear if the "cutoff" date is for the Last Interval's Start Date or the next one
-- examining the results shows there are 2 records after your"cutoff" date
-- add a WHERE statement to fix this if needed?
-- WHERE [IntervalDate] < '2014-01-30 00:00:00.000' -- this is your epoch timestamp
ORDER BY [repeat_startID], StartDate;

-- produces: (Column #4 is what you are interested in)
1   Billy Visit 2014-01-03 10:00:00.000 2014-01-03 10:00:00.000 604800  1   2
1   Billy Visit 2014-01-03 10:00:00.000 2014-01-10 10:00:00.000 604800  1   2
1   Billy Visit 2014-01-03 10:00:00.000 2014-01-17 10:00:00.000 604800  1   2
1   Billy Visit 2014-01-03 10:00:00.000 2014-01-24 10:00:00.000 604800  1   2
1   Billy Visit 2014-01-03 10:00:00.000 2014-01-31 10:00:00.000 604800  1   2 -- occurs after '2014-01-30 00:00:00.000'
1   Billy Visit 2014-01-04 18:00:00.000 2014-01-04 18:00:00.000 604800  3   4
1   Billy Visit 2014-01-04 18:00:00.000 2014-01-11 18:00:00.000 604800  3   4
1   Billy Visit 2014-01-04 18:00:00.000 2014-01-18 18:00:00.000 604800  3   4
1   Billy Visit 2014-01-04 18:00:00.000 2014-01-25 18:00:00.000 604800  3   4
1   Billy Visit 2014-01-04 18:00:00.000 2014-02-01 18:00:00.000 604800  3   4 -- occurs after '2014-01-30 00:00:00.000'