Task 1 plpgsql

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diff --git a/challenge-211/luca-ferrari/postgresql/ch-1.sql b/challenge-211/luca-ferrari/postgresql/ch-1.sql
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+--
+-- Perl Weekly Challenge 211
+-- Task 1
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-211/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc211;
+
+CREATE OR REPLACE FUNCTION
+pwc211.task1_plpgsql( a int[][])
+RETURNS bool
+AS $CODE$
+DECLARE
+	current_row  int := 1;
+	current_col  int := 1;
+	previous_val int := NULL;
+BEGIN
+	WHILE current_row <= array_length( a, 1 ) LOOP
+	      IF current_row > array_length( a, 2 ) THEN
+	      	 RETURN false;
+              END IF;
+
+	      IF previous_val IS NULL THEN
+	      	 previous_val := a[ current_row ][ current_row ];
+	      ELSIF previous_val <> a[ current_row ][ current_row ] THEN
+	      	   RETURN false;
+             END IF;
+
+	     current_row := current_row + 1;
+	END LOOP;
+
+	RETURN true;
+END
+$CODE$
+LANGUAGE plpgsql;