每个分类各取10条数据，相同时间下的数据显示在一条记录下，这样的SELECT语句如何写

求教：每个分类各取10条数据，相同时间上的数据显示在一条记录上，这样的SELECT语句怎么写？

数据库MYSQL表如下：

表名：stockdata

ID TIME STOCK_NAME DATA1 DATA2 DATA3

1 9:30 银行 aaa bbb ccc

2 9:31 银行 ddd eee fff

.. …… … …. …. ….

11 9:30 证券 2aaa 2bbb 2ccc

12 9:31 证券 2ddd 2eee 2fff

.. …. …. …. …. ….

我想要的结果是：按STOCK_NAME这个字段个都取出最新的10条信息。每条记录包含在这个时间上的所有STOCK_NAME的三个数据都展示在一条记录上。请问怎么写。

银行证券

TIME DATA1 DATA2 DATA3 DATA1 DATA2 DATA3

9：31 ddd eee fff 2ddd 2eee 2fff

9: 30 aaa bbb ccc 2aaa 2bbb 2ccc

… … … … … … …

查询出来的表就是按这样的以时间排序，一条记录上显示每个分类的相同的字段名（DATA1 ,DATA2,DATA3）的数据。

无环境未测试：

SQL code

select id, stock_code, real_time, 
    sum(if(stock_code=991156, buycount, 0)) as buycount,
    sum(if(stock_code=991156, bigbuycount, 0)) as bigbuycount,
    sum(if(stock_code=991156, waitbuycount, 0)) as waitbuycount,
    sum(if(stock_code=881155, buycount, 0)) as buycount,
    sum(if(stock_code=881155, bigbuycount, 0)) as bigbuycount,
    sum(if(stock_code=881155, waitbuycount, 0)) as waitbuycount
from stock_data
group by real_time
order by real_time desc



select real_time,  
   MAX(if(stock_code=991156, buycount, 0)) as buycount,
   MAX(if(stock_code=991156, bigbuycount, 0)) as bigbuycount,
   MAX(if(stock_code=991156, waitbuycount, 0)) as waitbuycount,
   MAX(if(stock_code=881155, buycount, 0)) as buycount,
   MAX(if(stock_code=881155, bigbuycount, 0)) as bigbuycount,
   MAX(if(stock_code=881155, waitbuycount, 0)) as waitbuycount
from stock_data group by real_time order by stock_code desc

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