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-- Perl Weekly Challenge 161
CREATE SCHEMA IF NOT EXISTS pwc161;
CREATE OR REPLACE FUNCTION
pwc161.pangrams_plpgsql()
RETURNS SETOF TEXT
AS $CODE$
DECLARE
start_letter int;
end_letter int;
letter char;
current_word pwc161.dictionary%rowtype;
found_words text;
BEGIN
start_letter := ascii( 'a' );
end_letter := ascii( 'z' );
FOR l IN start_letter .. end_letter LOOP
letter := chr( l );
IF found_words LIKE '%' || letter || '%' THEN
CONTINUE;
END IF;
SELECT word
INTO current_word
FROM pwc161.dictionary
WHERE word like '%' || letter || '%'
ORDER BY RANDOM()
LIMIT 1;
found_words := found_words || ' ' || current_word;
RETURN NEXT current_word.word;
END LOOP;
RETURN;
END
$CODE$
LANGUAGE plpgsql;
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