Make a stored procedure implementation of finding min/max rank.

diff --git a/sql/ccbs.sql b/sql/ccbs.sql
index fa63774a20817419cadc4213bcaa223fb7b26921..ab682cdcacfa6b5dbe749b6722024e84328f834f 100644 (file)
--- a/sql/ccbs.sql
+++ b/sql/ccbs.sql
@@ -305,4 +305,34 @@ $$
     LANGUAGE plpgsql
     STABLE
     RETURNS NULL ON NULL INPUT;
     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;