查找重复值

Question

我有一个名为 Transfers 的表，我想查找在 Doc ID、Amount 和 Date 三列上具有重复值的所有记录。 基本上我需要的是找到Doc id，金额和日期相同的地方 我可以用来查找这些重复项的最佳查询是什么？

我尝试了以下查询

select transfers.doc_id,transfers.date,transfers.amount,
  from transfers 
 where transfers.date between $P{StartDate} and $P{EndDate}
 group by doc_id
having doc_id >1;

这是要寻找的结果：

Doc_id  Date        amount
1234    12/07/2019  3,000
1234    12/07/2019  3,000
2345    12/07/2019  15,000
2345    12/07/2019  15,000
4321    12/07/2019  5,600
4321    12/07/2019  5,600

Answer 1

使用这个：

select transfers.doc_id,transfers.date,transfers.amount,count(*) counts
from transfers
group by doc_id,date,amount
having counts>1;

输出将包含重复记录数：

doc_id  date        amount  counts
1234    12/07/2019  3,000   2
2345    12/07/2019  15,000  2
4321    12/07/2019  5,600   2

Answer 2

考虑将group by 用于三列group by doc_id,Amount,Date

select t.doc_id,t.date,t.amount
  from transfers t
 where t.date between $P{StartDate} and $P{EndDate}
 group by doc_id,Amount,Date
having count(doc_id) >1;