select 字段名 from 表名 group by 字段名 having count(字段名)>1;
首先要进行 group by 分组 再计算其数量大于1的数据
要切记你查看的内容(select 字段名)这一部分不可以显示全部数据(select *)
select MOBILE_PHONE
from TF_STAFF
GROUP BY MOBILE_PHONE
HAVING count(*) > 1
select 字段名 from 表名 group by 字段名 having count(字段名)>1;
首先要进行 group by 分组 再计算其数量大于1的数据
要切记你查看的内容(select 字段名)这一部分不可以显示全部数据(select *)
select MOBILE_PHONE
from TF_STAFF
GROUP BY MOBILE_PHONE
HAVING count(*) > 1