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+--
+-- Perl Weekly Challenge 263
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-263>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc263;
+
+CREATE OR REPLACE FUNCTION
+pwc263.task1_plpgsql( k int, nums int[] )
+RETURNS SETOF int
+AS $CODE$
+
+   SELECT x
+   FROM (
+   	SELECT v, row_number() over ( order by v ) as x
+	FROM unnest( nums ) v
+	WHERE v = k
+	)
+$CODE$
+LANGUAGE sql;