sql聚合函数 group by having
sql聚合函数 group by having 一般组合在一起使用
select count(*) from sys_tem group by stu_name having stu_age>0;
posted on 2016-02-14 17:48 2513485889_2016 阅读(261) 评论(0) 编辑 收藏 举报
sql聚合函数 group by having 一般组合在一起使用
select count(*) from sys_tem group by stu_name having stu_age>0;
posted on 2016-02-14 17:48 2513485889_2016 阅读(261) 评论(0) 编辑 收藏 举报