Task plpgsql done

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diff --git a/challenge-208/luca-ferrari/postgresql/ch-2.sql b/challenge-208/luca-ferrari/postgresql/ch-2.sql
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+--
+-- Perl Weekly Challenge 208
+-- Task 2
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-208/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc208;
+
+CREATE OR REPLACE FUNCTION
+pwc208.task2_plpgsql( l int[] )
+RETURNS TABLE( v int, d text )
+AS $CODE$
+	WITH res AS (
+	     SELECT v, count( vv ) AS c
+	     FROM generate_series( l[1], l[ array_length( l, 1 ) ] ) v
+	     LEFT JOIN unnest( l ) vv ON vv = v
+	     GROUP BY v
+	)
+	SELECT v, 'Duplicated value ' || v
+	FROM res
+	WHERE c > 1
+	UNION
+	SELECT v, 'Missing value ' || v
+	FROM res
+	WHERE c = 0;
+
+$CODE$
+LANGUAGE sql;