sql 交叉表

交叉表语句的实现:
　　用于:交叉表的列数是确定的
　　select name,sum(case subject when '数学' then source else 0 end) as '数学',
　　sum(case subject when '英语' then source else 0 end) as '英语',
　　sum(case subject when '语文' then source else 0 end) as '语文'
　　from test
　　group by name
　　--用于:交叉表的列数是不确定的
　　declare @sql varchar(8000)
　　set @sql = 'select name,'
　　select @sql = @sql + 'sum(case subject when '''+subject+'''
　　then source else 0 end) as '''+subject+''','
　　from (select distinct subject from test) as a
　　select @sql = left(@sql,len(@sql)-1) + ' from test group by name'
　　exec(@sql)
　　go