摘要: 构造测试数据(笛卡尔积,6 次100 万) create table t1(id int, val varchar(80)); set @i := 0;create table tmp as select (@i := @i + 1) as id from information_schema.ta 阅读全文
posted @ 2017-05-23 17:07 __Yoon 阅读(262) 评论(0) 推荐(0) 编辑