a数据库a

CREATE TABLE `a` (
  `sname` varchar(255) CHARACTER SET utf8 DEFAULT NULL,
  `cname` varchar(255) CHARACTER SET utf8 DEFAULT NULL,
  `score` varchar(255) CHARACTER SET utf8 DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

如何得到

Sql语句

SELECT
	sname,
	sum(
		CASE cname
		WHEN "语文" THEN
			score
		ELSE
			0
		END
	) AS 语文,
	sum(
		CASE cname
		WHEN "数学" THEN
			score
		ELSE
			0
		END
	) AS 数学
FROM
	a
GROUP BY sname