求一条sql解决方法
日期：2014-05-16 浏览次数：20972 次
求一条sql
------解决方案--------------------
------解决方案--------------------
with t as
(select 'zhangsan' stu, 'math' sub, 70 score
from dual
union all
select 'zhangsan' stu, 'english' sub, 70 score
from dual
union all
select 'zhangsan' stu, 'chinese' sub, 70 score
from dual
union all
select 'lisi' stu, 'chinese' sub, 70 score
from dual
union all
select 'lisi' stu, 'math' sub, 70 score
from dual
union all
select 'lisi' stu, 'english' sub, 70 score
from dual
union all
select 'wangwu' stu, 'english' sub, 70 score
from dual
union all
select 'wangwu' stu, 'math' sub, 70 score
from dual
union all
select 'wangwu' stu, 'chinese' sub, 70 score from dual)
select stu,
sum(decode(sub, 'chinese', score, null)) chinese,
sum(decode(sub, 'math', score, null)) math,
sum(decode(sub, 'english', score, null)) english
from t
group by t.stu
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