如题：
select
max(case when name=‘1‘ then [temp] else null end) as temp1
, max(case when name=‘2‘ then [temp] else null end) as temp2,
max(case when name=‘3‘ then [temp] else null end) as temp3
from historyt group by time
原文：http://blog.csdn.net/zhao50632/article/details/26579837
