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diff --git a/challenge-280/luca-ferrari/plpgsql/ch-1.sql b/challenge-280/luca-ferrari/plpgsql/ch-1.sql
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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;