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--
-- Perl Weekly Challenge 255
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-255>
--
CREATE SCHEMA IF NOT EXISTS pwc255;
CREATE OR REPLACE FUNCTION
pwc255.task2_plpgsql( p text, b text )
RETURNS SETOF text
AS $CODE$
DECLARE
BEGIN
CREATE TEMPORARY TABLE IF NOT EXISTS classification( w text );
TRUNCATE TABLE classification;
INSERT INTO classification
SELECT v
FROM regexp_split_to_table( p, '\W+' ) v;
RETURN QUERY
SELECT w FROM (
SELECT w, count(*) AS c
FROM classification
WHERE w <> b
GROUP BY w
ORDER BY c DESC
LIMIT 1
);
END
$CODE$
LANGUAGE plpgsql;
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