Posted by haifeng on 2015-09-15 09:35:41 last update 2015-10-12 10:46:57 | Edit | Answers (1)
查询那些只出售笔记本电脑, 不出售 PC 的厂商.
查询在一种或者两种 PC 机中出现过的硬盘的容量.
1
Posted by haifeng on 2015-09-15 09:38:38
使用 Group by hd where count(Model)<=2
