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--
-- Perl Weekly Challenge 331
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-331>
--
CREATE SCHEMA IF NOT EXISTS pwc331;
CREATE OR REPLACE FUNCTION
pwc331.task2_plpgsql( l text, r text)
RETURNS boolean
AS $CODE$
DECLARE
diffs int := 0;
BEGIN
IF l = r THEN
RETURN true;
END IF;
IF length( l ) != length( r ) THEN
RETURN false;
END IF;
WITH
lt AS (
SELECT lc::text, row_number() over () as lr
FROM regexp_split_to_table( l, '' ) lc
)
, rt AS (
SELECT rc::text, row_number() over () as rr
FROM regexp_split_to_table( r, '' ) rc
)
SELECT count(*)
into diffs
FROM lt, rt
WHERE rr = lr
AND lc <> rc
;
IF diffs > 2 THEN
RETURN false;
ELSE
RETURN true;
END IF;
END
$CODE$
LANGUAGE plpgsql;
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