摘要: 笛卡尔乘积查询select A.*,B.* from A cross join bselect id,name,pass,user from A,B,C where A.id=b.id and B.id=C.id 阅读全文
posted @ 2008-11-14 18:18 刘佳忻 阅读(165) 评论(0) 推荐(0) 编辑