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drop function if exists diakNaploSorszam;
DELIMITER //
CREATE function diakNaploSorszam ( thisDiakId INT, thisTanev INT, thisOsztalyId INT ) returns INT
READS SQL DATA
BEGIN
DECLARE inKezdesDt,inZarasDt DATE;
DECLARE a,i INT; -- for loop
DECLARE b DATE; -- for loop
DECLARE cur1
CURSOR FOR
SELECT diakId,IF(beDt<inKezdesDt,inKezdesDt,beDt) AS d FROM osztalyDiak LEFT JOIN diak USING (diakId) WHERE osztalyId=thisOsztalyId AND beDt<=inZarasDt AND (kiDt IS NULL OR kiDt>=inKezdesDt) ORDER BY d, CONCAT_WS(' ',viseltCsaladinev,viseltUtonev) COLLATE utf8_hungarian_ci;
DECLARE CONTINUE HANDLER FOR NOT FOUND RETURN NULL;
SELECT kezdesDt FROM szemeszter WHERE tanev=thisTanev AND szemeszter=1 INTO inKezdesDt;
SELECT MAX(zarasDt) FROM szemeszter WHERE tanev=thisTanev INTO inZarasDt;
SET i := 1;
OPEN cur1;
lo: LOOP
FETCH cur1 INTO a,b;
IF a = thisDiakId THEN
LEAVE lo;
END IF;
SET i := i+1;
END LOOP;
CLOSE cur1;
return i;
END; //
DELIMITER ; //
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