Created
December 23, 2018 16:18
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http://diskuse.jakpsatweb.cz/index.php?action=vthread&topic=97602&forum=28&page=-1 | |
1/ uzivatelske promenne | |
SET @minule := 0; | |
SET @poradi := 0; | |
SET @radek := 1; | |
UPDATE | |
poradi, | |
( | |
SELECT | |
tym, | |
body, | |
@poradi := IF(@minule = body, @poradi, @radek) AS poradi, | |
@radek := @radek + 1 AS radek, | |
@minule := body AS tmp | |
FROM poradi | |
ORDER BY body DESC | |
) AS vypocet | |
SET poradi.poradi = vypocet.poradi | |
WHERE poradi.tym = vypocet.tym; | |
2/ Kajman , nejdrive nastavit pozice klasicky 1,2,3, .. a pak vybrat ty co jsou vicekrat a znova update | |
update tabulka, | |
(select body1, body2, body3, min(poradi) poradi | |
from tabulka | |
group by body1, body2, body3 | |
having count(*) > 1) as vypocet | |
set tabulka.poradi = vypocet.poradi | |
where tabulka.body1 = vypocet.body1 | |
and tabulka.body2 = vypocet.body2 | |
and tabulka.body3 = vypocet.body3 | |
3/ za behu korelovany dotaz | |
SELECT SQL_NO_CACHE | |
(SELECT COUNT(*) + 1 FROM poradi as t1 WHERE t1.body > t2.body) AS rank, t2.tym, t2.body | |
FROM poradi as t2 | |
4/ Moje procedura :) | |
CREATE PROCEDURE `SP_poradi`() | |
BEGIN | |
DECLARE s_poradi INT(5); | |
DECLARE s_body INT(5); | |
DECLARE temp_body INT(5) DEFAULT 0; | |
DECLARE s_tym VARCHAR(50); | |
DECLARE my_rank INT(5) DEFAULT 0; | |
DECLARE done TINYINT(1) DEFAULT 0; | |
DECLARE position TINYINT DEFAULT 0; | |
DECLARE i INT; | |
DECLARE rank CURSOR FOR | |
SELECT tym, body, poradi FROM poradi | |
ORDER BY body DESC; | |
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; | |
SET i = 0; | |
OPEN rank; | |
rank_loop: LOOP | |
FETCH rank INTO s_tym, s_body, s_poradi; | |
IF done THEN LEAVE rank_loop; END IF; | |
SET i=i+1; | |
IF (temp_body <> s_body) | |
THEN SET position = i; | |
ELSE | |
SET position = position; | |
END IF; | |
UPDATE poradi SET poradi = position WHERE tym = s_tym; | |
SET temp_body = s_body; | |
END LOOP rank_loop; | |
CLOSE rank; | |
END | |
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