Hi lowell

I've tested the code and it worked beautifully. I need a little help though, I got the logic wrong when I explained the issue originally. There should never be any instance of the pattern not starting with a 1;however, the very first row generated needs to be the very first instance of the start date, not the start date with 7 adds added. I have tried to get around this by slightly altering the case statement to replace the first row date with the actual start date but then the second row date that is generated doesn't use the replace start date from the first row but the original, meaning that it's out by a week.

Any ideas?

Here's the code I've changed

;WITH

TENS (N) AS (SELECT 0 UNION ALL SELECT 0 UNION ALL SELECT 0 UNION ALL

SELECT 0 UNION ALL SELECT 0 UNION ALL SELECT 0 UNION ALL

SELECT 0 UNION ALL SELECT 0 UNION ALL SELECT 0 UNION ALL SELECT 0),

THOUSANDS (N) AS (SELECT 1 FROM TENS t1 CROSS JOIN TENS t2 CROSS JOIN TENS t3),

TALLY (N) AS (SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 0)) FROM THOUSANDS)

,

TestCTE(reference,StartDate,Pattern,PatternLength) AS

(

SELECT 'VideoGames-S1',convert(datetime,'01/01/2013 10:45'),'11 111 111111  1111','18' --Course 13NAPUSD-B2

)

SELECT

                                'StartTime' =

                                CASE

                                WHEN Tally.N = 1 THEN [startdate]

                                WHEN SUBSTRING([pattern],N,1) = '1'  THEN DATEADD(wk,Tally.N,[startdate]) ELSE NULL 

                                END,

                                TestStartDate_DATEADD = DATEADD(wk,Tally.N,[startdate])

                                ,*

                                , SUBSTRING([pattern],N,1)

FROM

                                TestCTE testcte

CROSS JOIN Tally tally

WHERE

                                N <= LEN([pattern])

--AND SUBSTRING([pattern],N,1) = '1'

ORDER BY

                                reference, N