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--
-- Perl Weekly Challenge 206
-- Task 1
--
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-206/>
--
CREATE SCHEMA IF NOT EXISTS pwc206;
CREATE OR REPLACE FUNCTION
pwc206.task1_plpgsql( t text[] )
RETURNS time
AS $CODE$
DECLARE
m time;
t1 text;
t2 text;
BEGIN
FOREACH t1 IN ARRAY t LOOP
FOREACH t2 IN ARRAY t LOOP
IF t1 = t2 THEN
CONTINUE;
END IF;
IF m IS NULL OR ( t2::time - t1::time ) < m THEN
m := ( t2::time - t1::time );
END IF;
END LOOP;
END LOOP;
RETURN m;
END
$CODE$
LANGUAGE plpgsql;
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