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--
-- Perl Weekly Challenge 207
-- Task 1
--
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-207/>
--
CREATE SCHEMA IF NOT EXISTS pwc207;
CREATE OR REPLACE FUNCTION
pwc207.task1_plpgsql( w text[] )
RETURNS SETOF text
AS $CODE$
DECLARE
current_word text;
current_row text;
letters_found int;
BEGIN
CREATE TEMPORARY TABLE IF NOT EXISTS keyboard( k text );
TRUNCATE keyboard;
INSERT INTO keyboard( k )
VALUES( 'qwertyuiop' ), ( 'asdfghjkl' ), ( 'zxcvbnm' );
FOREACH current_word IN ARRAY w LOOP
FOR current_row IN SELECT k FROM keyboard LOOP
letters_found := 0;
SELECT count(*)
INTO letters_found
FROM regexp_split_to_table( current_word, '' ) ww
JOIN regexp_split_to_table( current_row, '' ) kk
ON ww = kk;
IF letters_found = length( current_word ) THEN
RETURN NEXT current_word;
EXIT;
END IF;
END LOOP;
END LOOP;
RETURN;
END
$CODE$
LANGUAGE plpgsql;
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