查找给定日期范围内的重复项

Question

我正在尝试查找一个查询，它将返回数据库集中具有重复符号（标识符）并且在给定日期范围内的所有条目。

我尝试过这样的事情：

select * from dmt_teamresource where dmt_teamresource.signum IN (
select dmt_teamresource.signum from dmt_teamresource group by dmt_teamresource.signum having count((dmt_teamresource.signum)) > 1) 

从 dmt_teamresource 返回所有重复的条目。现在我需要以某种方式添加日期范围。正在考虑类似的事情：

where dmt_teamresource.startdate is between '2021-01-31' and '2021-12-31'

但不知道如何组合查询。

Answer 1

使用窗口函数：

select tr.*
from (select ts.*, count(*) over (partition by tr.signum) as cnt
      from dmt_teamresource tr
      where . . .   -- whatever conditions you want here
     ) tr
where cnt >= 2;