SQL SERVER行列转换

行列转换
要用到SQL SERVER
CASE [字段名] WHEN ‘字段名’ THEN [字段的数据值] ELSE 0 END
CASE WHEN [字段名] = ‘字段名’ THEN [字段的数据值] ELSE 0 END
判断一个字段名是否和这个改字段名相等，如果相等，就得到字段的数据值，否则为0.

Student

score

输出表格式

SELECT  s3.uid,s3.age,s3.name,
SUM(CASE s3.sname WHEN '英语' THEN scores ELSE 0 END) AS '数学',
SUM(CASE s3.sname WHEN '数学' THEN scores ELSE 0 END)     AS '英语',
SUM(CASE s3.sname WHEN '语文' THEN scores ELSE 0 END) AS '语文'   
FROM (select s1.uid,s1.name,s1.age,sname,scores,sid from 
dbo.student as s1,dbo.score as s2 where s1.uid = s2.uid) as s3
GROUP BY  s3.uid,s3.age,s3.name;