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+--
+-- Perl Weekly Challenge 266
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-266>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc266;
+
+CREATE OR REPLACE FUNCTION
+pwc266.task1_plpgsql( l text, r text )
+RETURNS SETOF text
+AS $CODE$
+
+   WITH left_words AS (
+   	   SELECT w, count( w ) as c
+	   FROM regexp_split_to_table( l, '\W+' ) w
+   	   GROUP BY 1
+	   )
+    , right_words AS (
+          SELECT w, count( w ) as c
+          FROM regexp_split_to_table( R, '\W+' ) w
+          GROUP BY 1
+    )
+
+    SELECT w
+    FROM left_words
+    WHERE w NOT IN ( SELECT w FROM right_words )
+    AND c = 1
+    UNION
+    SELECT w
+    FROM right_words
+    WHERE w NOT IN ( SELECT w FROM left_words )
+    AND c = 1
+   ;
+
+$CODE$
+LANGUAGE sql;