Task 2 sql done

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diff --git a/challenge-201/luca-ferrari/postgresql/ch-2.sql b/challenge-201/luca-ferrari/postgresql/ch-2.sql
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+--
+-- Perl Weekly Challenge 201
+-- Task 2
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-201/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc201;
+
+CREATE OR REPLACE FUNCTION
+pwc201.task2_plpgsql( n int )
+RETURNS int
+AS $CODE$
+   SELECT pwc201.task2_plperl( n );
+$CODE$
+LANGUAGE sql;