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

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