按不在Oracle中工作分组-

当我运行下面的查询时，它工作正常

select  TO_CHAR(mydate ,'YYYYMMDD') , count(*) from table
where columnA = '123'
group by TO_CHAR(mydate,'YYYYMMDD')

但是当我尝试按排序时，它失败了

select  TO_CHAR(mydate ,'YYYYMMDD') , count(*) from table
where columnA = '123'
group by TO_CHAR(mydate,'YYYYMMDD')
order by mydate desc

同样地，当我尝试在日期上做任何算术运算时，我也会得到相同的错误

select  TO_CHAR(mydate +10/24 ,'YYYYMMDD') , count(*) from table
where columnA = '123'
group by TO_CHAR(mydate,'YYYYMMDD')
order by mydate desc

有人能告诉我，订购和添加10个小时的最佳方式是什么吗？

试试这个：

select  TO_CHAR(mydate ,'YYYYMMDD')  from table
where columnA = '123'
group by TO_CHAR(mydate,'YYYYMMDD')
order by mydate desc

也就是说，您需要将

select

的所有列放入

groupby

中，以使其正常工作

编辑：-

select  TO_CHAR(mydate ,'YYYYMMDD') , count(someID) from table
where columnA = '123'
group by TO_CHAR(mydate,'YYYYMMDD')
order by mydate desc
having count(someID)>1