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--
-- Perl Weekly Challenge 207
-- Task 2
--
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-207/>
--
CREATE SCHEMA IF NOT EXISTS pwc207;
CREATE OR REPLACE FUNCTION
pwc207.task2_plpgsql( citations int[] )
RETURNS SETOF int
AS $CODE$
DECLARE
BEGIN
RETURN QUERY WITH d AS (
SELECT c, row_number() OVER ( ORDER BY c desc ) r
FROM unnest( citations ) c
)
SELECT MIN( r )
FROM d
WHERE r >= c
;
END
$CODE$
LANGUAGE plpgsql;
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