sql 使用group by，having，count函数查询表中某字段相同内容的数据

Posted 2020-12-13 Johnny

方法一：

select  n_code from table1(表名) where  n_orgid is not null
                group by n_code,n_orgid
                         having count(n_orgid)>1
 

方法二

select *  from 
        (select count(n_code) as c  from table1(表名) 
                group by n_code,n_orgid) as tt
                                 where c>1;