mysql动态行转列
DROP TABLE IF EXISTS `score`; CREATE TABLE `score` ( `id` int(11) NOT NULL AUTO_INCREMENT, `class` varchar(255) DEFAULT NULL, `score` double DEFAULT NULL, `userid` int(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=latin1; INSERT INTO `score` VALUES (‘1‘, ‘math‘, ‘90‘, ‘1‘); INSERT INTO `score` VALUES (‘2‘, ‘english‘, ‘90‘, ‘1‘); INSERT INTO `score` VALUES (‘3‘, ‘computer‘, ‘80‘, ‘1‘); INSERT INTO `score` VALUES (‘4‘, ‘sports‘, ‘90‘, ‘1‘); INSERT INTO `score` VALUES (‘5‘, ‘math‘, ‘80‘, ‘2‘); INSERT INTO `score` VALUES (‘6‘, ‘english‘, ‘85‘, ‘2‘); INSERT INTO `score` VALUES (‘7‘, ‘computer‘, ‘100‘, ‘2‘);
查询语句
SET @EE=‘‘; set @str_tmp=‘‘; SELECT @EE:=CONCAT(@EE,‘SUM(IF(class=\‘‘,class,‘\‘‘,‘,score,0)) AS ‘,class,‘,‘) as aa into @str_tmp FROM (SELECT DISTINCT class FROM score) A order by length(aa) desc limit 1; SET @QQ=CONCAT(‘SELECT ifnull(score.userid,\‘total\‘),‘,LEFT(@str_tmp,char_length(@str_tmp)-1),‘ ,SUM(score) AS TOTAL FROM score GROUP BY userid WITH ROLLUP‘); PREPARE stmt FROM @QQ; EXECUTE stmt ; deallocate prepare stmt;
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