返回operation表中time列的唯一值
语句1
select time from operation group by time having count(time) > 1
语句2
select distinct time from operation;
返回operation表中time列的唯一值
语句1
select time from operation group by time having count(time) > 1
语句2
select distinct time from operation;
原文：https://www.cnblogs.com/wei-jing/p/8206640.html