blob: e215785cc7f4a85bef7d4d18d1d5e8e255c13ef2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
--
-- Perl Weekly Challenge 289
-- Task 1
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-289>
--
CREATE SCHEMA IF NOT EXISTS pwc289;
CREATE OR REPLACE FUNCTION
pwc289.task1_plpgsql( n int[] )
RETURNS int
AS $CODE$
DECLARE
found_max int;
BEGIN
IF array_length( n, 1 ) > 3 THEN
WITH s AS (
SELECT v, row_number() OVER ( ORDER BY v DESC ) AS r
FROM unnest( n ) v
GROUP BY v
ORDER BY v DESC
)
SELECT v
INTO found_max
FROM s
WHERE
r = 3
;
ELSE
SELECT MAX( v )
INTO found_max
FROM unnest( n ) v;
END IF;
RETURN found_max;
END
$CODE$
LANGUAGE plpgsql;
|
