Tukeran back link yah :D
]]>T/R
patrick
we will create dynamic sql request (with lets say last ten days), and then loop through those days adding new column.
DELIMITER $$
DROP PROCEDURE IF EXISTS `a`.`days`$$
CREATE PROCEDURE `a`.`days` ()
BEGIN
DECLARE l_sql VARCHAR(4000);
DECLARE l_date VARCHAR(10);
# select for dates (2009-11-01, 2009-11-02, etc)
DECLARE cur1 CURSOR FOR
SELECT DISTINCT(d.name) as `date`
FROM `date` d
LIMIT 10;
OPEN cur1;
#start your query
SET l_sql=”SELECT kn.name “;
BEGIN
DECLARE EXIT HANDLER FOR NOT FOUND BEGIN END;
LOOP
FETCH cur1 INTO l_date;
# dynamic add to l_sql as many times as many dates you have in cur1
SET l_sql=CONCAT(l_sql,”, SUM(IF(d.name=’”,l_date,”‘,value,0)) AS ‘”,l_date,”‘ “);
END LOOP;
END;
CLOSE cur1;
#finish l_sql
SET l_sql=CONCAT(l_sql,” FROM samples GROUP BY something_id”);
#uncomment to see generated query
#SELECT l_sql;
#now prepare query and execute
SET @sql=l_sql;
PREPARE s1 FROM @sql;
EXECUTE s1;
DEALLOCATE PREPARE s1;
END;
$$
DELIMITER