获取用户第 2 个月交易的所有交易明细

Question

正在尝试获取所有客户的第 2 个交易月份详细信息

Date          User_id      amount
2021-11-01      1           100
2021-11-21      1           200
2021-12-20      2           110
2022-01-20      2           200
2022-02-04      1            50
2022-02-21      1           100
2022-03-22      2           200

对于每个客户获取他们第二次交易当月的所有记录（特定用户在一个月和一天内可以有多次交易）

预期输出

Date       User_id      amount
2022-02-04      1          50
2022-02-21      1          100
2022-01-20      2          200

Answer 1

如果 dense_rank 是一个选项，您可以：

with cte1 as (
    select *, extract(year_month from date) as yyyymm
    from t
), cte2 as (
    select *, dense_rank() over (partition by user_id order by yyyymm) as dr
    from cte1
)
select *
from cte2
where dr = 2

请注意，可以使用一个 cte 编写上述内容。

Answer 2

您可以使用 dense_rank:

select Date, User_id, amount from
(select *, dense_rank() over(partition by User_id order by year(Date), month(date)) r
from table_name) t
where r = 2;

Fiddle

获取用户第 2 个月交易的所有交易明细

Get all transaction details of a user f their 2nd month of transaction

mysql

sql

date

ranking-functions