列转行--行转列问题(3)
来源：未知 责任编辑：责任编辑 发表时间:2014-03-23 22:32 点击:次
Nike 0 0 0 85
Kent 80 0 0 0
Kent 0 90 0 0
Kent 0 0 70 0
Kent 0 0 0 85
下一步，聚合分组，最终完成任务。
令一种实现方式：
SELECT
UserName,
sum(decode(subject,'语文',score,0)) AS "语文",
sum(decode(subject,'数学',score,0)) AS "数学",
sum(decode(subject,'英语',score,0)) AS "英语",
sum(decode(subject,'生物',score,0)) AS "生物"
FROM StudentScores www.2cto.com
GROUP BY UserName;
问题：实现列转行
解决：
1、准备数据：
create table ScoresStudent as SELECT
UserName,
sum(decode(subject,'语文',score,0)) AS "语文",
sum(decode(subject,'数学',score,0)) AS "数学",
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