mysql 行列转换

DELIMITER $$

USE `report_b011`$$

DROP PROCEDURE IF EXISTS `SP_RPT_ttt`$$

CREATE DEFINER=`root`@`%` PROCEDURE `SP_RPT_ttt`()

BEGIN

 SET @EE='';

     SET @SS='';

     SELECT 

(SELECT *FROM(

SELECT @EE:=CONCAT(@EE,'SUM(IF(AREA_NAME=\'',AREA_NAME,'\'',',NUM,0)) AS ',AREA_NAME,',') FROM (SELECT DISTINCT AREA_NAME FROM t_vod_col_click_num_by_day) A) t

ORDER BY 1 DESC  LIMIT 1) INTO @SS; 

SET @QQ=CONCAT('SELECT ifnull(COLUMNNAME,\'total\'),',LEFT(@SS,LENGTH(@SS)-1),'SUM(NUM) TOTAL FROM t_vod_col_click_num_by_day GROUP BY COLUMNNAME WITH ROLLUP');

PREPARE stmt2 FROM @QQ;

EXECUTE stmt2;

END$$

DELIMITER ;