From 63544803b9ba1949099c79b44e494437dea671a6 Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Sat, 11 Jun 2005 23:40:15 +0000
Subject: [PATCH] Make a stored procedure implementation of finding min/max
 rank.

---
 sql/ccbs.sql | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/sql/ccbs.sql b/sql/ccbs.sql
index fa63774..ab682cd 100644
--- a/sql/ccbs.sql
+++ b/sql/ccbs.sql
@@ -305,4 +305,34 @@ $$
     LANGUAGE plpgsql
     STABLE
     RETURNS NULL ON NULL INPUT;
+
+-- use the minmax_score as a basis for finding best and worst possible ranks
+CREATE TYPE minmax_rank AS (
+	player INTEGER,
+	best_rank INTEGER,
+	worst_rank INTEGER
+);
+
+-- get_minmax_score_for_players(tournament, round, playmode)
+CREATE FUNCTION get_minmax_rank_for_players(integer, integer, varchar) RETURNS SETOF minmax_rank
+    AS $$
+DECLARE
+	ret minmax_rank;
+	tp RECORD;
+BEGIN
+	CREATE TEMPORARY TABLE temp_minmax AS SELECT * FROM get_minmax_score_for_players($1, $2, $3);
+	FOR tp IN SELECT * FROM temp_minmax LOOP
+		ret.player = tp.player;
+		ret.best_rank = 1 + ( SELECT COUNT(*) FROM temp_minmax WHERE min_score >= tp.max_score AND player<>tp.player);
+		ret.worst_rank = 1 + ( SELECT COUNT(*) FROM temp_minmax WHERE max_score > tp.min_score AND player<>tp.player );
+
+		RETURN NEXT ret;
+	END LOOP;
+	DROP TABLE temp_minmax;	
+	RETURN;
+END;
+    $$
+    LANGUAGE plpgsql
+    VOLATILE    -- not really, but needed for the TEMPORARY TABLE
+    RETURNS NULL ON NULL INPUT;
     
-- 
2.39.2