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;
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;
转载于:https://www.cnblogs.com/2513485889-2016/p/5189396.html