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DateAdd problem

I am trying to subtract 1 month from the current YearMOnth...It's datatype is a varchar(6)

Current    HowIwant
201001     200912

I am using this but not getting the correct result

SELECT yearmonth, dateadd(M, datediff(month, 0, yearmonth) - 1, 0)
from tableA
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asked Mar 01, 2012 at 04:10 PM in Default

sqlLearner 1 gravatar image

sqlLearner 1
792 34 38 45

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1 answer: sort voted first

You can't use datetime functions on varchar like that - it has no idea that the string is supposed to represent 'yyyymm'

try this

SELECT 
 left(
  convert(varchar, 
    dateadd(M, datediff(month, 0, convert(date, yearmonth +'01', 112)) - 1, 0)
    ,112)
 ,6)
This converts your string +'01', which is the style 112, to a date, and then does the dateadd manipulation.
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answered Mar 01, 2012 at 04:18 PM

Kev Riley gravatar image

Kev Riley ♦♦
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@kev Riley That works but produces the answer in the format 2009-11-01 00:00:00.000
Mar 01, 2012 at 04:33 PM sqlLearner 1
sorry missed off the final convert.....edited!
Mar 01, 2012 at 04:45 PM Kev Riley ♦♦
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asked: Mar 01, 2012 at 04:10 PM

Seen: 798 times

Last Updated: Mar 01, 2012 at 04:47 PM