Task 1 plpgsql

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diff --git a/challenge-200/luca-ferrari/postgresql/ch-1.sql b/challenge-200/luca-ferrari/postgresql/ch-1.sql
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+++ b/challenge-200/luca-ferrari/postgresql/ch-1.sql
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+--
+-- Perl Weekly Challenge 200
+-- Task 1
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-200/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc200;
+
+CREATE OR REPLACE FUNCTION
+pwc200.task1_plpgsql( list int[] )
+RETURNS SETOF int[]
+AS $CODE$
+DECLARE
+BEGIN
+
+	FOR i IN 2 .. array_length( list, 1 ) - 1 LOOP
+		IF list[ i + 1 ] - list [ i ] = list[ i ] - list[ i - 1 ] THEN
+		   RETURN NEXT array[ list[ i - 1 ], list[ i ], list[ i + 1 ] ];
+		END IF;
+	END LOOP;
+
+RETURN;
+
+END
+$CODE$
+LANGUAGE plpgsql;