一条SQL语句

领测软件测试网 以前没见过。。。
数据库这一块这是大啊。。。

select distinct y.cid from orders x, orders y where y.pid = x.pid and x.aid = @#a06@#;
                                      ~~~~~~~~~~~~以前没见过同一个表 两次

原来要实现的目的是：
Get cid values of customers who order a product for which an order is also placed by agent a06.
                                                                                                           ~~关键就是这个词了
ps:几个表
CUSTOMERS cid cname city discnt
PRODUCT pid pname city quantity price
AGENTS  aid aname city percent
ORDERS ordno month cid aid pid qty dollars

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