Need work around to split date range into months

Question

Hi All,
I have a requirement to split the data range in source table to months.
here is the source table
ID Sdate Edate Code
===============================
501 1/4/2009 4/30/2009 AH
501 5/1/2009 9/30/2009 AB
502 1/1/2014 5/31/2014 AC
Here is my target
ID Sdate Edate Code
================================
501 1/4/2009 1/31/2009 AH
501 2/1/2009 2/28/2009 AH
501 3/1/2009 3/31/2009 AH
501 4/1/2009 4/30/2009 AH
501 5/1/2009 5/31/2009 AB
501 6/1/2009 6/30/2009 AB
501 7/1/2009 7/31/2009 AB
501 8/1/2009 8/31/2009 AB
501 9/1/2009 9/30/2009 AB
502 1/1/2014 1/31/2014 AC
502 2/1/2014 2/28/2014 AC
502 3/1/2014 3/31/2014 AC
502 4/1/2014 4/30/2014 AC
502 5/1/2014 5/31/2014 AC
Please provide some input.
Thanks a lot in advance.

Answer 1

That means your database is in a different locale than mine. When I select cast(Edate as varchar), I get the date returned in the format 'YYYY-MM-DD'. That's why I use(left(cast(Edate as varchar),4) + right(left(cast(Edate as varchar),7),2) to get it the format 'YYYYMM' before converting it into an integer.
Your database most probably returns dates in a format like D/MM/YYYY. That's the reason for the error you get. You'll have to select (right(cast(Edate as varchar),4) + left(right(cast(Edate as varchar),7),2) to obtain the same results as I do.
Alternatively, you can use the convert function to obtain the same results:
     select max(
     cast(left(convert(varchar,Edate,102),4) + right(left(convert(varchar,Edate,102),7),2) as int) + 1 -
     cast(left(convert(varchar,Sdate,102),4) + right(left(convert(varchar,Sdate,102),7),2) as int))
     FROM src_split'
It's always good practice to test the SQL-statements in your database client first before including them in a DS script.
Also, I suddenly realise this statement will only return the correct result when your Edate and Sdate are always within the same year. If that's not the case, but the gap between Edate and Sdate is always less than 10 years, change your statement to:
     select max(
     cast(left(convert(varchar,Edate,102),4) + right(left(convert(varchar,Edate,102),7),2) as int) + 1 -
     cast(left(convert(varchar,Sdate,102),4) + right(left(convert(varchar,Sdate,102),7),2) as int)) % 88
     FROM src_split'