行转化为列

SELECT id,
(SELECT Score FROM Table_1 WHERE KeMu=\'数学\' AND id=a.id)as 数学,
(SELECT Score FROM Table_1 WHERE KeMu=\'语文\' AND id=a.id)AS 语文,
(SELECT Score FROM Table_1 WHERE KeMu=\'英语\' AND id=a.id)AS 英语
FROM Table_1 a
GROUP BY a.id