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--
-- Perl Weekly Challenge 325
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-325>
--
CREATE SCHEMA IF NOT EXISTS pwc325;
CREATE OR REPLACE FUNCTION
pwc325.task2_plpgsql( prices int[] )
RETURNS SETOF int
AS $CODE$
DECLARE
current_price int;
BEGIN
FOR i IN 1 .. array_length( prices, 1 ) LOOP
SELECT prices[ i ] -
( SELECT v
FROM unnest( prices[ i + 1 : array_length( prices, 1 ) - 1 ] ) v
WHERE v::int < prices[ i ]
LIMIT 1
)
INTO current_price;
IF NOT FOUND THEN
RETURN NEXT prices[ i ];
ELSE
RETURN NEXT current_price;
END IF;
END LOOP;
RETURN;
END
$CODE$
LANGUAGE plpgsql;
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