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Message Posted: Mon, 01 Jan 2007 @ 15:45:19 GMT

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Subj:   Re: STRING functions: Counting character occurrences
From:   Michael Larkins


I didn't have a lot of time this morning and this could be a bit more efficient, but it might help get you started on the recursive:

     with recursive dt (col, loc, partcol, cnt) as
     (select col, position('A' in col), case loc when 0 then ' ' else
     substring(col from index(col,'A')+1) end, case when loc > 0 then 1 else
     0 end
     from temp
     union all
     select col, position('A' in partcol) nwloc, case loc when 0 then ' '
     else substring(partcol from loc+1) end, cnt+1
     from dt
     where loc > 0 and partcol <> ' ' )

     sel col, max(cnt) from dt group by col

Hope this helps,

Michael Larkins
Certified Teradata Master
Certified Teradata SQL Instructor

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