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--
-- Perl Weekly Challenge 280
-- Task 1
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-280>
--
CREATE SCHEMA IF NOT EXISTS pwc280;
CREATE OR REPLACE FUNCTION
pwc280.task1_plpgsql( s text )
RETURNS char
AS $CODE$
DECLARE
needle char;
counting int;
BEGIN
FOR needle IN SELECT v::char FROM regexp_split_to_table( s, '' ) v LOOP
counting := 0;
SELECT count( * )
INTO counting
FROM regexp_split_to_table( s, '' ) v
WHERE v = needle;
IF counting > 1 THEN
RETURN needle;
END IF;
END LOOP;
RETURN NULL;
END
$CODE$
LANGUAGE plpgsql;
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