On Wed, 5 Mar 2008, Osvaldo Rosario Kussama wrote:
Jeff Frost escreveu:
I've got an interesting one...I'm trying to find columns that have three or
fewer distinct characters (for example, "aaaaaaaaaa"). Wondering if I need
to write a function or if someone has an idea how to do it with built in
functions and/or pattern matching?
I think the thing to do would be to lowercase everything, then remove all
duplicate chars and spaces, then use length() on that, but it's not obvious
to me how I might remove the duplicate chars with the pattern matching
support in the docs.
Try:
SELECT
array_to_string(array(
SELECT DISTINCT lower(substr('aabbcdddef AB',i,1))
FROM generate_series(1,length('aabbcdddef AB'))
s(i))
, '');
Osvaldo, that appears to work perfectly! Thank you much!
--
Jeff Frost, Owner <[EMAIL PROTECTED]>
Frost Consulting, LLC http://www.frostconsultingllc.com/
Phone: 650-780-7908 FAX: 650-649-1954
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